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Greenland ice sheet

Coordinates: 76°42′N 41°12′W / 76.7°N 41.2°W / 76.7; -41.2
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Greenland ice sheet
Grønlands indlandsis
Sermersuaq
TypeIce sheet
Coordinates76°42′N 41°12′W / 76.7°N 41.2°W / 76.7; -41.2[1]
Area1,710,000 km2 (660,000 sq mi)[2]
Length2,400 km (1,500 mi)[1]
Width1,100 km (680 mi)[1]
Thickness1.67 km (1.0 mi) (average), ~3.5 km (2.2 mi) (maximum)[2]

The Greenland ice sheet is an ice sheet which forms the second largest body of ice in the world. It is an average of 1.67 km (1.0 mi) thick, and over 3 km (1.9 mi) thick at its maximum.[2] It is almost 2,900 kilometres (1,800 mi) long in a north–south direction, with a maximum width of 1,100 kilometres (680 mi) at a latitude of 77°N, near its northern edge.[1] The ice sheet covers 1,710,000 square kilometres (660,000 sq mi), around 80% of the surface of Greenland, or about 12% of the area of the Antarctic ice sheet.[2] The term 'Greenland ice sheet' is often shortened to GIS or GrIS in scientific literature.[3][4][5][6]

Greenland has had major glaciers and ice caps for at least 18 million years,[7] but a single ice sheet first covered most of the island some 2.6 million years ago.[8] Since then, it has both grown[9][10] and contracted significantly.[11][12][13] The oldest known ice on Greenland is about 1 million years old.[14] Due to anthropogenic greenhouse gas emissions, the ice sheet is now the warmest it has been in the past 1000 years,[15] and is losing ice at the fastest rate in at least the past 12,000 years.[16]

Every summer, parts of the surface melt and ice cliffs calve into the sea. Normally the ice sheet would be replenished by winter snowfall,[4] but due to global warming the ice sheet is melting two to five times faster than before 1850,[17] and snowfall has not kept up since 1996.[18] If the Paris Agreement goal of staying below 2 °C (3.6 °F) is achieved, melting of Greenland ice alone would still add around 6 cm (2+1⁄2 in) to global sea level rise by the end of the century. If there are no reductions in emissions, melting would add around 13 cm (5 in) by 2100,[19]: 1302  with a worst-case of about 33 cm (13 in).[20] For comparison, melting has so far contributed 1.4 cm (1⁄2 in) since 1972,[21] while sea level rise from all sources was 15–25 cm (6–10 in) between 1901 and 2018.[22]: 5 

If all 2,900,000 cubic kilometres (696,000 cu mi) of the ice sheet were to melt, it would increase global sea levels by ~7.4 m (24 ft).[2] Global warming between 1.7 °C (3.1 °F) and 2.3 °C (4.1 °F) would likely make this melting inevitable.[6] However, 1.5 °C (2.7 °F) would still cause ice loss equivalent to 1.4 m (4+1⁄2 ft) of sea level rise,[23] and more ice will be lost if the temperatures exceed that level before declining.[6] If global temperatures continue to rise, the ice sheet will likely disappear within 10,000 years.[24][25] At very high warming, its future lifetime goes down to around 1,000 years.[20]

Description

[edit]
See also: Greenland Ice Sheet Project and Greenland ice core project
Greenland ice sheet as seen from space
A narrated tour about Greenland's ice sheet.

Ice sheets form through a process of glaciation, when the local climate is sufficiently cold that snow is able to accumulate from year to year. As the annual snow layers pile up, their weight gradually compresses the deeper levels of snow to firn and then to solid glacier ice over hundreds of years.[13] Once the ice sheet formed in Greenland, its size remained similar to its current state.[26] However, there have been 11 periods in Greenland's history when the ice sheet extended up to 120 km (75 mi) beyond its current boundaries; with the last one around 1 million years ago.[9][10]

The pattern of ice flows at the Greenland ice sheet, with arrows pointing to outlet glaciers where ice calving occurs[27]

The weight of the ice causes it to slowly "flow", unless it is stopped by a sufficiently large obstacle, such as a mountain.[13] Greenland has many mountains near its coastline, which normally prevent the ice sheet from flowing further into the Arctic Ocean. The 11 previous episodes of glaciation are notable because the ice sheet grew large enough to flow over those mountains.[9][10] Nowadays, the northwest and southeast margins of the ice sheet are the main areas where there are sufficient gaps in the mountains to enable the ice sheet to flow out to the ocean through outlet glaciers. These glaciers regularly shed ice in what is known as ice calving.[28] Sediment released from calved and melting ice sinks accumulates on the seafloor, and sediment cores from places such as the Fram Strait provide long records of glaciation at Greenland.[7]

Geological history

[edit]
Timeline of the ice sheet's formation from 2.9 to 2.6 million years ago[3]

While there is evidence of large glaciers in Greenland for most of the past 18 million years,[7] these ice bodies were probably similar to various smaller modern examples, such as Maniitsoq and Flade Isblink, which cover 76,000 and 100,000 square kilometres (29,000 and 39,000 sq mi) around the periphery. Conditions in Greenland were not initially suitable for a single coherent ice sheet to develop, but this began to change around 10 million years ago, during the middle Miocene, when the two passive continental margins which now form the uplands of West and East Greenland experienced uplift, and ultimately formed the upper planation surface at a height of 2000 to 3000 meter above sea level.[29][30]

Later uplift, during the Pliocene, formed a lower planation surface at 500 to 1000 meters above sea level. A third stage of uplift created multiple valleys and fjords below the planation surfaces. This uplift intensified glaciation due to increased orographic precipitation and cooler surface temperatures, allowing ice to accumulate and persist.[29][30] As recently as 3 million years ago, during the Pliocene warm period, Greenland's ice was limited to the highest peaks in the east and the south.[31] Ice cover gradually expanded since then,[8] until the atmospheric CO2 levels dropped to between 280 and 320 ppm 2.7–2.6 million years ago, by which time temperatures had dropped sufficiently for the disparate ice caps to connect and cover most of the island.[3]

Ice cores and sediment samples

[edit]
For much of the past 120,000 years, the climate of Greenland has been colder than in the last few millennia of recorded history (upper half), allowing the ice sheet to become considerably larger than it is now (lower half).[32]

The base of the ice sheet may be warm enough due to geothermal activity to have liquid water beneath it.[33] This liquid water, under pressure from the weight of ice above it, may cause erosion, eventually leaving nothing but bedrock below the ice sheet. However, there are parts of the Greenland ice sheet, near the summit, where the ice sheet slides over a basal layer of ice which had frozen solid to the ground, preserving ancient soil, which can then be recovered by drilling. The oldest such soil was continuously covered by ice for around 2.7 million years,[13] while another, 3 kilometres (1.9 mi) deep ice core from the summit has revealed ice that is around ~1,000,000 years old.[14]

Sediment samples from the Labrador Sea provide evidence that nearly all of the south Greenland ice had melted around 400,000 years ago, during Marine Isotope Stage 11.[11][34] Other ice core samples from Camp Century in northwestern Greenland, show that the ice there melted at least once during the past 1.4 million years, during the Pleistocene, and did not return for at least 280,000 years.[12] These findings suggest that less than 10% of the current ice sheet volume was left during those geologically recent periods, when the temperatures were less than 2.5 °C (4.5 °F) warmer than preindustrial conditions. This contradicts how climate models typically simulate the continuous presence of solid ice under those conditions.[35][13] Analysis of the ~100,000-year records obtained from 3 km (1.9 mi) long ice cores drilled between 1989 and 1993 into the summit of Greenland's ice sheet, had provided evidence for geologically rapid changes in climate, and informed research on tipping points such as in the Atlantic meridional overturning circulation (AMOC).[36]

Glaciologist at work

Ice cores provide valuable information about the past states of the ice sheet, and other kinds of paleoclimate data. Subtle differences in the oxygen isotope composition of the water molecules in ice cores can reveal important information about the water cycle at the time,[37] while air bubbles frozen within the ice core provide a snapshot of the gas and particulate composition of the atmosphere through time.[38][39]When properly analyzed, ice cores provide a wealth of proxies suitable for reconstructing the past temperature record,[37] precipitation patterns,[40] volcanic eruptions,[41] solar variation,[38] ocean primary production,[39] and even changes in soil vegetation cover and the associated wildfire frequency.[42] The ice cores from Greenland also record human impact, such as lead production during the time of Ancient Greece[43] and the Roman Empire.[44]

Recent melting

[edit]
Arctic temperature trend, 1981–2007

From the 1960s to the 1980s an area in the North Atlantic which included southern Greenland was one of the few locations in the world which showed cooling rather than warming.[45][46] This location was relatively warmer in the 1930s and 1940s than in the decades immediately before or after.[47] More complete data sets have established trends of warming and ice loss starting from 1900[48](well after the start of the Industrial Revolution and its impact on global carbon dioxide levels[49]) and a trend of strong warming starting around 1979, in line with concurrent observed Arctic sea ice decline.[50] In 1995– 1999, central Greenland was already 2 °C (3.6 °F) warmer than it was in the 1950s. Between 1991 and 2004, average winter temperature at one location, Swiss Camp, rose almost 6 °C (11 °F).[51]

Consistent with this warming, the 1970s were the last decade when the Greenland ice sheet grew, gaining about 47 gigatonnes per year. From 1980–1990 there was an average annual mass loss of ~51 Gt/y.[21] The period 1990–2000 showed an average annual loss of 41 Gt/y,[21] with 1996 being the last year the Greenland ice sheet saw net mass gain. As of 2022, the Greenland ice sheet had been losing ice for 26 years in a row,[18] and temperatures there had been the highest in the entire past last millennium – about 1.5 °C (2.7 °F) warmer than the 20th century average.[15]

Until 2007, rate of decrease in ice sheet height in cm per year

Several factors determine the net rate of ice sheet growth or decline. These are:

  • Accumulation and melting rates of snow in and around the centre
  • Melting of ice along the sheet's margins
  • Ice calving into the sea from outlet glaciers also along the sheet's edges

When the IPCC Third Assessment Report was published in 2001, the analysis of observations to date had shown that the ice accumulation of 520 ± 26 gigatonnes per year was offset by runoff and bottom melting equivalent to ice losses of 297±32 Gt/yr and 32±3 Gt/yr, and iceberg production of 235±33 Gt/yr, with a net loss of −44 ± 53 gigatonnes per year.[52]

Annual ice losses from the Greenland ice sheet accelerated in the 2000s, reaching ~187 Gt/yr in 2000–2010, and an average mass loss during 2010–2018 of 286 Gt per year. Half of the ice sheet's observed net loss (3,902 gigatons (Gt) of ice between 1992 and 2018, or approximately 0.13% of its total mass[53]) happened during those 8 years. When converted to sea level rise equivalent, the Greenland ice sheet contributed about 13.7 mm since 1972.[21]

Trends of ice loss between 2002 and 2019[54]

Between 2012 and 2017, it contributed 0.68 mm per year, compared to 0.07 mm per year between 1992 and 1997.[53] Greenland's net contribution for the 2012–2016 period was equivalent to 37% of sea level rise from land ice sources (excluding thermal expansion).[55] These melt rates are comparable to the largest experienced by the ice sheet over the past 12,000 years.[16]

Currently, the Greenland ice sheet loses more mass every year than the Antarctic ice sheet, because of its position in the Arctic, where it is subject to intense regional amplification of warming.[45][56][57] Ice losses from the West Antarctic Ice Sheet have been accelerating due to its vulnerable Thwaites and Pine Island Glaciers, and the Antarctic contribution to sea level rise is expected to overtake that of Greenland later this century.[17][19]

Observed glacier retreat

[edit]
This narrated animation shows the overall change in the elevation of the Greenland ice sheet between 2003 and 2012. The coastal areas of the ice sheet lost far more height, or "thinned", compared to the more inland regions.
Greenland ice sheet has 215 marine-terminating glaciers whose retreat directly impacts sea level rise. As of 2021, 115 accounted for 79% of ice flow and could be simulated with good accuracy, 25 had their retreat underestimated and accounted for 13%, 67 lacked sufficient bathymetry surveys while accounting for 5% of the flow, and 8 had their retreat overestimated, accounting for the remaining 3%.[58]

Retreat of outlet glaciers as they shed ice into the Arctic is a large factor in the decline of Greenland's ice sheet. Estimates suggest that losses from glaciers explain between 49% and 66.8% of observed ice loss since the 1980s.[21][53] Net loss of ice was already observed across 70% of the ice sheet margins by the 1990s, with thinning detected as the glaciers started to lose height.[59] Between 1998 and 2006, thinning occurred four times faster for coastal glaciers compared to the early 1990s,[60] falling at rates between 1 m (3+1⁄2 ft) and 10 m (33 ft) per year,[61] while the landlocked glaciers experienced almost no such acceleration.[60]

One of the most dramatic examples of thinning was in the southeast, at Kangerlussuaq Glacier. It is over 20 mi (32 km) long, 4.5 mi (7 km) wide and around 1 km (1⁄2 mi) thick, which makes it the third largest glacier in Greenland.[62] Between 1993 and 1998, parts of the glacier within 5 km (3 mi) of the coast lost 50 m (164 ft) in height.[63] Its observed ice flow speed went from 3.1–3.7 mi (5–6 km) per year in 1988–1995 to 8.7 mi (14 km) per year in 2005, which was then the fastest known flow of any glacier.[62] The retreat of Kangerlussuaq slowed down by 2008,[64] and showed some recovery until 2016–2018, when more rapid ice loss occurred.[65]

Greenland's other major outlet glaciers have also experienced rapid change in recent decades. Its single largest outlet glacier is Jakobshavn Isbræ (Greenlandic: Sermeq Kujalleq) in west Greenland, which has been observed by glaciologists for many decades.[66] It historically sheds ice from 6.5% of the ice sheet[67] (compared to 4% for Kangerlussuaq[62]), at speeds of ~20 metres (66 ft) per day.[68] While it lost enough ice to retreat around 30 km (19 mi) between 1850 and 1964, its mass gain increased sufficiently to keep it in balance for the next 35 years,[68] only to switch to rapid mass loss after 1997.[69][67] By 2003, the average annual ice flow speed had almost doubled since 1997, as the ice tongue in front of the glacier disintegrated,[69] and the glacier shed 94 square kilometres (36 sq mi) of ice between 2001 and 2005.[70] The ice flow reached 45 metres (148 ft) per day in 2012,[71] but slowed down substantially afterwards, and showed mass gain between 2016 and 2019.[72][73]

Northern Greenland's Petermann Glacier is smaller in absolute terms, but experienced some of the most rapid degradation in recent decades. It lost 85 square kilometres (33 sq mi) of floating ice in 2000–2001, followed by a 28-square-kilometre (11 sq mi) iceberg breaking off in 2008, and then a 260 square kilometres (100 sq mi) iceberg calving from ice shelf in August 2010. This became the largest Arctic iceberg since 1962, and amounted to a quarter of the shelf's size.[74] In July 2012, Petermann glacier lost another major iceberg, measuring 120 square kilometres (46 sq mi), or twice the area of Manhattan.[75] As of 2023, the glacier's ice shelf had lost around 40% of its pre-2010 state, and it is considered unlikely to recover from further ice loss.[76]

In the early 2010s, some estimates suggested that tracking the largest glaciers would be sufficient to account for most of the ice loss.[77] However, glacier dynamics can be hard to predict, as shown by the ice sheet's second largest glacier, Helheim Glacier. Its ice loss culminated in rapid retreat in 2005,[78] associated with a marked increase in glacial earthquakes between 1993 and 2005.[79] Since then, it has remained comparatively stable near its 2005 position, losing relatively little mass in comparison to Jakobshavn and Kangerlussuaq,[80] although it may have eroded sufficiently to experience another rapid retreat in the near future.[81] Meanwhile, smaller glaciers have been consistently losing mass at an accelerating rate,[82] and later research has concluded that total glacier retreat is underestimated unless the smaller glaciers are accounted for.[21] By 2023, the rate of ice loss across Greenland's coasts had doubled in the two decades since 2000, in large part due to the accelerated losses from smaller glaciers.[83][84]

Processes accelerating glacier retreat

[edit]
Petermann Glacier experiences notable shifts from year to year not just at its calving front, but also at its grounding line, which renders it less stable. If such behaviour turns out to be widespread at other glaciers, this could potentially double their rates of ice loss.[85]

Since the early 2000s, glaciologists have concluded that glacier retreat in Greenland is accelerating too quickly to be explained by a linear increase in melting in response to greater surface temperatures alone, and that additional mechanisms must also be at work.[86][87][88] Rapid calving events at the largest glaciers match what was first described as the "Jakobshavn effect" in 1986:[89] thinning causes the glacier to be more buoyant, reducing friction that would otherwise impede its retreat, and resulting in a force imbalance at the calving front, with an increase in velocity spread across the mass of the glacier.[90][91][67] The overall acceleration of Jakobshavn Isbrae and other glaciers from 1997 onwards had been attributed to the warming of North Atlantic waters which melt the glacier fronts from underneath. While this warming had been going on since the 1950s,[92] 1997 also saw a shift in circulation which brought relatively warmer currents from the Irminger Sea into closer contact with the glaciers of West Greenland.[93] By 2016, waters across much of West Greenland's coastline had warmed by 1.6 °C (2.9 °F) relative to 1990s, and some of the smaller glaciers were losing more ice to such melting than normal calving processes, leading to rapid retreat.[94]

Conversely, Jakobshavn Isbrae is sensitive to changes in ocean temperature as it experiences elevated exposure through a deep subglacial trench.[95][96] This sensitivity meant that an influx of cooler ocean water to its location was responsible for its slowdown after 2015,[73] in large part because the sea ice and icebergs immediately off-shore were able to survive for longer, and thus helped to stabilize the glacier.[97] Likewise, the rapid retreat and then slowdown of Helheim and Kangerdlugssuaq has also been connected to the respective warming and cooling of nearby currents.[98] At Petermann Glacier, the rapid rate of retreat has been linked to the topography of its grounding line, which appears to shift back and forth by around a kilometer with the tide. It has been suggested that if similar processes can occur at the other glaciers, then their eventual rate of mass loss could be doubled.[99][85]

Meltwater rivers may flow down into moulins and reach the base of the ice sheet

There are several ways in which increased melting at the surface of the ice sheet can accelerate lateral retreat of outlet glaciers. Firstly, the increase in meltwater at the surface causes larger amounts to flow through the ice sheet down to bedrock via moulins. There, it lubricates the base of the glaciers and generates higher basal pressure, which collectively reduces friction and accelerates glacial motion, including the rate of ice calving. This mechanism was observed at Sermeq Kujalleq in 1998 and 1999, where flow increased by up to 20% for two to three months.[100][101] However, some research suggests that this mechanism only applies to certain small glaciers, rather than to the largest outlet glaciers,[102] and may have only a marginal impact on ice loss trends.[103]

An illustration of how meltwater forms a plume once it flows out into the ocean

Secondly, once meltwater flows into the ocean, it can still impact the glaciers by interacting with ocean water and altering its local circulation - even in the absence of any ocean warming.[104] In certain fjords, large meltwater flows from beneath the ice may mix with ocean water to create turbulent plumes that can be damaging to the calving front.[105] While the models generally consider the impact from meltwater run-off as secondary to ocean warming,[106] observations of 13 glaciers found that meltwater plumes play a greater role for glaciers with shallow grounding lines.[107] Further, 2022 research suggests that the warming from plumes had a greater impact on underwater melting across northwest Greenland.[104]

Finally, it has been shown that meltwater can also flow through cracks that are too small to be picked up by most research tools - only 2 cm (1 in) wide. Such cracks do not connect to bedrock through the entire ice sheet but may still reach several hundred meters down from the surface.[108] Their presence is important, as it weakens the ice sheet, conducts more heat directly through the ice, and allows it to flow faster.[109] This recent research is not currently captured in models. One of the scientists behind these findings, Alun Hubbard, described finding moulins where "current scientific understanding doesn’t accommodate" their presence, because it disregards how they may develop from hairline cracks in the absence of existing large crevasses that are normally thought to be necessary for their formation.[110]

Observed surface melting

[edit]
Satellite measurements of Greenland's ice cover from 1979 to 2009 reveals a trend of increased melting.
NASA's MODIS and QuikSCAT satellite data from 2007 were compared to confirm the precision of different melt observations.

Currently, the total accumulation of ice on the surface of Greenland ice sheet is larger than either outlet glacier losses individually or surface melting during the summer, and it is the combination of both which causes net annual loss.[4] For instance, the ice sheet's interior thickened by an average of 6 cm (2.4 in) each year between 1994 and 2005, in part due to a phase of [[North Atlantic oscillation]] increasing snowfall.[111] Every summer, a so-called snow line separates the ice sheet's surface into areas above it, where snow continues to accumulate even then, with the areas below the line where summer melting occurs.[112] The exact position of the snow line moves around every summer, and if it moves away from some areas it covered the previous year, then those tend to experience substantially greater melt as their darker ice is exposed. Uncertainty about the snow line is one of the factors making it hard to predict each melting season in advance.[113]

Satellite image of dark melt ponds

A notable example of ice accumulation rates above the snow line is provided by Glacier Girl, a Lockheed P-38 Lightning fighter plane which had crashed early in World War II and was recovered in 1992, by which point it had been buried under 268 ft (81+1⁄2 m) of ice.[114] Another example occurred in 2017, when an Airbus A380 had to make an emergency landing in Canada after one of its jet engines exploded while it was above Greenland; the engine's massive air intake fan was recovered from the ice sheet two years later, when it was already buried beneath 4 ft (1 m)of ice and snow.[115]

While summer surface melting has been increasing, it is still expected that it will be decades before melting will consistently exceed snow accumulation on its own.[4] It is also hypothesized that the increase in global precipitation associated with the effects of climate change on the water cycle could increase snowfall over Greenland, and thus further delay this transition[116].[117] This hypothesis was difficult to test in the 2000s due to the poor state of long-term precipitation records over the ice sheet.[118] By 2019, it was found that while there was an increase in snowfall over southwest Greenland,[119] there had been a substantial decrease in precipitation over western Greenland as a whole.[117] Further, more precipitation in the northwest had been falling as rain instead of snow, with a fourfold increase in rain since 1980.[120] Rain is warmer than snow and forms darker and less thermally insulating ice layer once it does freeze on the ice sheet. It is particularly damaging when it falls due to late-summer cyclones, whose increasing occurrence has been overlooked by the earlier models.[121] There has also been an increase in water vapor, which paradoxically increases melting by making it easier for heat to radiate downwards through moist, as opposed to dry, air.[122]

NASA graphics show the extent of the then-record melting event in July 2012.

Altogether, the melt zone below the snow line, where summer warmth turns snow and ice into slush and melt ponds, has been expanding at an accelerating rate since the beginning of detailed measurements in 1979. By 2002, its area was found to have increased by 16% since 1979, and the annual melting season broke all previous records.[45] Another record was set in July 2012, when the melt zone extended to 97% of the ice sheet's cover,[123] and the ice sheet lost approximately 0.1% of its total mass (2900 Gt) during that year's melting season, with the net loss (464 Gt) setting another record.[124] It became the first directly observed example of a "massive melting event", when the melting took place across practically the entire ice sheet surface, rather than specific areas.[125] That event led to the counterintuitive discovery that cloud cover, which normally results in cooler temperature due to their albedo, actually interferes with meltwater refreezing in the firn layer at night, which can increase total meltwater runoff by over 30%.[126][127] Thin, water-rich clouds have the worst impact, and they were the most prominent in July 2012.[128]

Rivers of meltwater flowing on 21 July 2012.

Ice cores had shown that the last time a melting event of the same magnitude as in 2012 took place was in 1889, and some glaciologists had expressed hope that 2012 was part of a 150-year cycle.[129][130] This was disproven in summer 2019, when a combination of high temperatures and unsuitable cloud cover led to an even larger mass melting event, which ultimately covered over 300,000 sq mi (776,996.4 km2) at its greatest extent. Predictably, 2019 set a new record of 586 Gt net mass loss.[54][131] In July 2021, another record mass melting event occurred. At its peak, it covered 340,000 sq mi (880,596.0 km2), and led to daily ice losses of 88 Gt across several days.[132][133] High temperatures continued in August 2021, with the melt extent staying at 337,000 sq mi (872,826.0 km2). At that time, rain fell for 13 hours at Greenland's Summit Station, located at 10,551 ft (3,215.9 m) elevation.[134] Researchers had no rain gauges to measure the rainfall, because temperatures at the summit have risen above freezing only three times since 1989 and it had never rained there before.[135]

Due to the enormous thickness of the central Greenland ice sheet, even the most extensive melting event can only affect a small fraction of it before the start of the freezing season, and so they are considered "short-term variability" in the scientific literature. Nevertheless, their existence is important: the fact that the current models underestimate the extent and frequency of such events is considered to be one of the main reasons why the observed ice sheet decline in Greenland and Antarctica tracks the worst-case rather than the moderate scenarios of the IPCC Fifth Assessment Report's sea-level rise projections.[136][137][138] Some of the most recent scientific projections of Greenland melt now include an extreme scenario where a massive melting event occurs every year across the studied period (i.e. every year between now and 2100 or between now and 2300), to illustrate that such a hypothetical future would greatly increase ice loss, but still wouldn't melt the entire ice sheet within the study period.[139][140]

Changes in albedo

[edit]
Albedo change in Greenland

On the ice sheet, annual temperatures are generally substantially lower than elsewhere in Greenland: about −20 °C (−4 °F) at the south dome (latitudes 63°–65°N) and −31 °C (−24 °F) near the center of the north dome (latitude 72°N (the fourth highest "summit" of Greenland).[1] On 22 December 1991, a temperature of −69.6 °C (−93.3 °F) was recorded at an automatic weather station near the topographic summit of the Greenland Ice Sheet, making it the lowest temperature ever recorded in the Northern Hemisphere. The record went unnoticed for more than 28 years and was finally recognized in 2020.[141] These low temperatures are in part caused by the high albedo of the ice sheet, as its bright white surface is very effective at reflecting sunlight. Ice-albedo feedback means that as the temperatures increase, this causes more ice to melt and either reveal bare ground or even just to form darker melt ponds, both of which act to reduce albedo, which accelerates the warming and contributes to further melting. This is taken into account by the climate models, which estimate that a total loss of the ice sheet would increase global temperature by 0.13 °C (0.23 °F), while Greenland's local temperatures would increase by between 0.5 °C (0.90 °F) and 3 °C (5.4 °F).[142][24][25]

Even incomplete melting already has some impact on the ice-albedo feedback. Besides the formation of darker melt ponds, warmer temperatures enable increasing growth of algae on the ice sheet's surface. Mats of algae are darker in colour than the surface of the ice, so they absorb more thermal radiation and increase the rate of ice melt.[143] In 2018, it was found that the regions covered in dust, soot, and living microbes and algae altogether grew by 12% between 2000 and 2012.[144] In 2020, it was demonstrated that the presence of algae, which is not accounted for by ice sheet models unlike soot and dust, had already been increasing annual melting by 10–13%.[145] Additionally, as the ice sheet slowly gets lower due to melting, surface temperatures begin to increase and it becomes harder for snow to accumulate and turn to ice, in what is known as surface-elevation feedback.[146][147]

Meltwater runoff has the greatest positive effect on phytoplankton when it can force nitrate-rich waters to the surface (b), which will become more difficult as the glaciers retreat (d).[148]

Geophysical and biochemical role of Greenland's meltwater

[edit]
See also: Marine primary production and Atlantic meridional overturning circulation

Even in 1993, Greenland's melt resulted in 300 cubic kilometers of fresh meltwater entering the seas annually, which was substantially larger than the liquid meltwater input from the Antarctic ice sheet, and equivalent to 0.7% of freshwater entering the oceans from all of the world's rivers.[149] This meltwater is not pure, and contains a range of elements - most notably iron, about half of which (around 0.3 million tons every year) is bioavailable as a nutrient for phytoplankton.[150] Thus, meltwater from Greenland enhances ocean primary production, both in the local fjords,[151] and further out in the Labrador Sea, where 40% of the total primary production had been attributed to nutrients from meltwater.[152]

Since the 1950s, the acceleration of Greenland melt caused by climate change has already been increasing productivity in waters off the North Icelandic Shelf,[153] while productivity in Greenland's fjords is also higher than it had been at any point in the historical record, which spans from late 19th century to present.[154] Some research suggests that Greenland's meltwater mainly benefits marine productivity not by adding carbon and iron, but through stirring up lower water layers that are rich in nitrates and thus bringing more of those nutrients to phytoplankton on the surface. As the outlet glaciers retreat inland, the meltwater will be less able to impact the lower layers, which implies that benefit from the meltwater will diminish even as its volume grows.[148]

A photo of a meltwater flow at Russell Glacier. Water emerging through the small crack comes from the melting of underground ice and is particularly rich in carbon.[155]

The impact of meltwater from Greenland goes beyond nutrient transport. For instance, meltwater also contains dissolved organic carbon, which comes from the microbial activity on the ice sheet's surface, and, to a lesser extent, from the remnants of ancient soil and vegetation beneath the ice.[156] There is about 0.5-27 billion tonnes of pure carbon underneath the entire ice sheet, and much less within it.[157] This is much less than the 1400–1650 billion tonnes contained within the Arctic permafrost,[158] or the annual anthropogenic emissions of around 40 billion tonnes of CO2.[19]: 1237 ) Yet, the release of this carbon through meltwater can still act as a climate change feedback if it increases overall carbon dioxide emissions.[159]

There is one known area, at Russell Glacier, where meltwater carbon is released into the atmosphere in the form of methane (see arctic methane emissions), which has a much larger global warming potential than carbon dioxide.[155] However, the area also harbours large numbers of methanotrophic bacteria, which limit those methane emissions.[160][161]

In 2021, research claimed that there must be mineral deposits of mercury (a highly toxic heavy metal) beneath the southwestern ice sheet, because of the exceptional concentrations in meltwater entering the local fjords. If confirmed, these concentrations would have equalled up to 10% of mercury in all of the world's rivers.[162][163] In 2024, a follow-up study found only "very low" concentrations in meltwater from 21 locations. It concluded that the 2021 findings were best explained by accidental sample contamination with mercury(II) chloride, used by the first team of researchers as a reagent.[164] However, there is still a risk of toxic waste being released from Camp Century, formerly a United States military site built to carry nuclear weapons for the Project Iceworm. The project was cancelled, but the site was never cleaned up, and it now threatens to pollute the meltwater with nuclear waste, 20,000 liters of chemical waste and 24 million liters of untreated sewage as the melt progresses.[165][166]

The cold blob visible on NASA's global mean temperatures for 2015, the warmest year on record up to 2015 (since 1880). Colors indicate temperature evolution (NASA/NOAA; 20 January 2016).[167]

Finally, increased quantities of fresh meltwater can affect ocean circulation.[45] Some scientists have connected this increased discharge from Greenland with the so-called cold blob in the North Atlantic, which is in turn connected to Atlantic meridional overturning circulation, or AMOC, and its apparent slowdown.[168][169][170][171] In 2016, a study attempted to improve forecasts of future AMOC changes by incorporating better simulation of Greenland trends into projections from eight state-of-the-art climate models. That research found that by 2090–2100, the AMOC would weaken by around 18% (with a range of potential weakening between 3% and 34%) under Representative Concentration Pathway 4.5, which is most akin to the current trajectory,[172][173] while it would weaken by 37% (with a range between 15% and 65%) under Representative Concentration Pathway 8.5, which assumes continually increasing emissions. If the two scenarios are extended past 2100, then the AMOC ultimately stabilizes under RCP 4.5, but it continues to decline under RCP 8.5: the average decline by 2290–2300 is 74%, and there is 44% likelihood of an outright collapse in that scenario, with a wide range of adverse effects.[174]

Future ice loss

[edit]

Near-term

[edit]
Greenland ice sheet's impact on sea level rise under the worst-case warming scenario, by 2300.
By the year 2300, enough of Greenland's ice would melt to add ~3 m (10 ft) to sea levels under RCP8.5, the worst possible climate change scenario.[140] Currently, RCP8.5 is considered much less likely[175] than RCP 4.5, which lies in between the worst-case and the Paris Agreement goals.[172][173]
Sea level rise from all sources by the year 2300, under different climate scenarios.
If countries cut greenhouse gas emissions significantly (lowest trace), then sea level rise by 2100 can be limited to 0.3–0.6 m (1–2 ft).[176] If the emissions instead accelerate rapidly (top trace), sea levels could rise 5 m (16+1⁄2 ft) by the year 2300, which would include ~3 m (10 ft) caused by the melting of the Greenland ice sheet shown on the left.[176]

In 2021, the IPCC Sixth Assessment Report estimated that under SSP5-8.5, the scenario associated with the highest global warming, Greenland ice sheet melt would add around 13 cm (5 in) to the global sea levels (with a likely (17%–83%) range of 9–18 cm (3+1⁄2–7 in) and a very likely range (5–95% confidence level) of 5–23 cm (2–9 in)), while the "moderate" SSP2-4.5 scenario adds 8 cm (3 in) with a likely and very likely range of 4–13 cm (1+1⁄2–5 in) and 1–18 cm (1⁄2–7 in), respectively. The optimistic scenario which assumes that the Paris Agreement goals are largely fulfilled, SSP1-2.6, adds around 6 cm (2+1⁄2 in) and no more than 15 cm (6 in), with a small chance of the ice sheet gaining mass and thus reducing the sea levels by around 2 cm (1 in).[19]: 1260 

Some scientists, led by James Hansen, have claimed that the ice sheets can disintegrate substantially faster than estimated by the ice sheet models,[177] but even their projections also have much of Greenland, whose total size amounts to 7.4 m (24 ft) of sea level rise,[2] survive the 21st century. A 2016 paper from Hansen claimed that Greenland ice loss could add around 33 cm (13 in) by 2060, in addition to double that figure from the Antarctic ice sheet, if the CO2 concentration exceeded 600 parts per million,[178] which was immediately controversial amongst the scientific community,[179] while 2019 research from different scientists claimed a maximum of 33 cm (13 in) by 2100 under the worst-case climate change scenario.[20]

Projections of 21st century retreat for Greenland's largest glaciers[58]

As with the present losses, not all parts of the ice sheet would contribute to them equally. For instance, it is estimated that on its own, the Northeast Greenland ice stream would contribute 1.3–1.5 cm by 2100 under RCP 4.5 and RCP 8.5, respectively.[180] On the other hand, the three largest glaciers - Jakobshavn, Helheim, and Kangerlussuaq - are all located in the southern half of the ice sheet, and just the three of them are expected to add 9.1–14.9 mm under RCP 8.5.[28] Similarly, 2013 estimates suggested that by 2200, they and another large glacier would add 29 to 49 millimetres by 2200 under RCP 8.5, or 19 to 30 millimetres under RCP 4.5.[181] Altogether, the single largest contribution to 21st century ice loss in Greenland is expected to be from the northwest and central west streams (the latter including Jakobshavn), and glacier retreat will be responsible for at least half of the total ice loss, as opposed to earlier studies which suggested that surface melting would become dominant later this century.[58] If Greenland were to lose all of its coastal glaciers, though, then whether or not it will continue to shrink will be entirely determined by whether its surface melting in the summer consistently outweighs ice accumulation during winter. Under the highest-emission scenario, this could happen around 2055, well before the coastal glaciers are lost.[4]

Sea level rise from Greenland does not affect every coast equally. The south of the ice sheet is much more vulnerable than the other parts, and the quantities of ice involved mean that there is an impact on the deformation of Earth's crust and on Earth's rotation. While this effect is subtle, it already causes East Coast of the United States to experience faster sea level rise than the global average.[182] At the same time, Greenland itself would experience isostatic rebound as its ice sheet shrinks and its ground pressure becomes lighter. Similarly, a reduced mass of ice would exert a lower gravitational pull on the coastal waters relative to the other land masses. These two processes would cause sea level around Greenland's own coasts to fall, even as it rises elsewhere.[183] The opposite of this phenomenon happened when the ice sheet gained mass during the Little Ice Age: increased weight attracted more water and flooded certain Viking settlements, likely playing a large role in the Viking abandonment soon afterwards.[184][185]

Long-term

[edit]
These graphs indicate the switch of peripheral glaciers to a dynamic state of sustained mass loss after the widespread retreat in 2000–2005, making their disappearance inevitable.[186]
2023 projections of how much the Greenland ice sheet may shrink from its present extent by the year 2300 under the worst possible climate change scenario (upper half) and of how much faster its remaining ice will be flowing in that case (lower half)[140]

Notably, the ice sheet's massive size simultaneously makes it insensitive to temperature changes in the short run, yet also commits it to enormous changes down the line, as demonstrated by paleoclimate evidence.[11][35][34] Polar amplification causes the Arctic, including Greenland, to warm three to four times more than the global average:[187][188][189] thus, while a period like the Eemian interglacial 130,000–115,000 years ago was not much warmer than today globally, the ice sheet was 8 °C (14 °F) warmer, and its northwest part was 130 ± 300 meters lower than it is at present.[190][191] Some estimates suggest that the most vulnerable and fastest-receding parts of the ice sheet have already passed "a point of no return" around 1997, and will be committed to disappearance even if the temperature stops rising.[192][186][193]

A 2022 paper found that the 2000–2019 climate would already result in the loss of ~3.3% volume of the entire ice sheet in the future, committing it to an eventual 27 cm (10+1⁄2 in) of SLR, independent of any future temperature change. They have additionally estimated that if the then-record melting seen on the ice sheet in 2012 were to become its new normal, then the ice sheet would be committed to around 78 cm (30+1⁄2 in) SLR.[139] Another paper suggested that paleoclimate evidence from 400,000 years ago is consistent with ice losses from Greenland equivalent to at least 1.4 m (4+1⁄2 ft) of sea level rise in a climate with temperatures close to 1.5 °C (2.7 °F), which are now inevitable at least in the near future.[23]

It is also known that at a certain level of global warming, effectively the entirety of the Greenland Ice Sheet will eventually melt. Its volume was initially estimated to amount to ~2,850,000 km3 (684,000 cu mi), which would increase the global sea levels by 7.2 m (24 ft),[52] but later estimates increased its size to ~2,900,000 km3 (696,000 cu mi), leading to ~7.4 m (24 ft) of sea level rise.[2]

Thresholds for total ice sheet loss

[edit]

In 2006, it was estimated that the ice sheet is most likely to be committed to disappearance at 3.1 °C (5.6 °F), with a plausible range between 1.9 °C (3.4 °F) and 5.1 °C (9.2 °F).[194] However, these estimates were drastically reduced in 2012, with the suggestion that the threshold may lie anywhere between 0.8 °C (1.4 °F) and 3.2 °C (5.8 °F), with 1.6 °C (2.9 °F) the most plausible global temperature for the ice sheet's disappearance.[195] That lowered temperature range had been widely used in the subsequent literature,[34][196] and in the year 2015, prominent NASA glaciologist Eric Rignot claimed that "even the most conservative people in our community" will agree that "Greenland’s ice is gone" after 2 °C (3.6 °F) or 3 °C (5.4 °F) of global warming.[146]

In 2022, a major review of scientific literature on tipping points in the climate system barely modified these values: it suggested that the threshold would be most likely be at 1.5 °C (2.7 °F), with the upper level at 3 °C (5.4 °F) and the worst-case threshold of 0.8 °C (1.4 °F) remained unchanged.[24][25] At the same time, it noted that the fastest plausible timeline for the ice sheet disintegration is 1000 years, which is based on research assuming the worst-case scenario of global temperatures exceeding 10 °C (18 °F) by 2500,[20] while its ice loss otherwise takes place over around 10,000 years after the threshold is crossed; the longest possible estimate is 15,000 years.[24][25]

Potential equilibrium states of the ice sheet in response to different equilibrium carbon dioxide concentrations in parts per million. Second and third states would result in 1.8 m (6 ft) and 2.4 m (8 ft) of sea level rise, while the fourth state is equivalent to 6.9 m (23 ft).[5]

Model-based projections published in the year 2023 had indicated that the Greenland ice sheet could be a little more stable than suggested by the earlier estimates. One paper found that the threshold for ice sheet disintegration is more likely to lie between 1.7 °C (3.1 °F) and 2.3 °C (4.1 °F). It also indicated that the ice sheet could still be saved, and its sustained collapse averted, if the warming were reduced to below 1.5 °C (2.7 °F), up to a few centuries after the threshold was first breached. However, while that would avert the loss of the entire ice sheet, it would increase the overall sea level rise by up to several meters, as opposed to a scenario where the warming threshold was not breached in the first place.[6]

Another paper using a more complex ice sheet model has found that since the warming passed 0.6 °C (1.1 °F) degrees, ~26 cm (10 in) of sea level rise became inevitable,[5] closely matching the estimate derived from direct observation in 2022.[139] However, it had also found that 1.6 °C (2.9 °F) would likely only commit the ice sheet to 2.4 m (8 ft) of long-term sea level rise, while near-complete melting of 6.9 m (23 ft) worth of sea level rise would occur if the temperatures consistently stay above 2 °C (3.6 °F). The paper also suggested that ice losses from Greenland may be reversed by reducing temperature to 0.6 °C (1.1 °F) or lower, up until the entirety of South Greenland ice melts, which would cause 1.8 m (6 ft) of sea level rise and prevent any regrowth unless CO2 concentrations is reduced to 300 ppm. If the entire ice sheet were to melt, it would not begin to regrow until temperatures fall to below the preindustrial levels.[5]

Aerial view of the ice sheet's eastern coast.

See also

[edit]

References

[edit]
  1. ^ a b c d e Greenland Ice Sheet. 24 October 2023. Archived from the original on 30 October 2017. Retrieved 26 May 2022.
  2. ^ a b c d e f g "How Greenland would look without its ice sheet". BBC News. 14 December 2017. Archived from the original on 7 December 2023. Retrieved 7 December 2023.
  3. ^ a b c Tan, Ning; Ladant, Jean-Baptiste; Ramstein, Gilles; Dumas, Christophe; Bachem, Paul; Jansen, Eystein (12 November 2018). "Dynamic Greenland ice sheet driven by pCO2 variations across the Pliocene Pleistocene transition". Nature Communications. 9 (1): 4755. doi:10.1038/s41467-018-07206-w. PMC 6232173. PMID 30420596.
  4. ^ a b c d e Noël, B.; van Kampenhout, L.; Lenaerts, J. T. M.; van de Berg, W. J.; van den Broeke, M. R. (19 January 2021). "A 21st Century Warming Threshold for Sustained Greenland Ice Sheet Mass Loss". Geophysical Research Letters. 48 (5): e2020GL090471. Bibcode:2021GeoRL..4890471N. doi:10.1029/2020GL090471. hdl:2268/301943. S2CID 233632072.
  5. ^ a b c d Höning, Dennis; Willeit, Matteo; Calov, Reinhard; Klemann, Volker; Bagge, Meike; Ganopolski, Andrey (27 March 2023). "Multistability and Transient Response of the Greenland Ice Sheet to Anthropogenic CO2 Emissions". Geophysical Research Letters. 50 (6): e2022GL101827. doi:10.1029/2022GL101827. S2CID 257774870.
  6. ^ a b c d Bochow, Nils; Poltronieri, Anna; Robinson, Alexander; Montoya, Marisa; Rypdal, Martin; Boers, Niklas (18 October 2023). "Overshooting the critical threshold for the Greenland ice sheet". Nature. 622 (7983): 528–536. Bibcode:2023Natur.622..528B. doi:10.1038/s41586-023-06503-9. PMC 10584691. PMID 37853149.
  7. ^ a b c Thiede, Jörn; Jessen, Catherine; Knutz, Paul; Kuijpers, Antoon; Mikkelsen, Naja; Nørgaard-Pedersen, Niels; Spielhagen, Robert F (2011). "Millions of Years of Greenland Ice Sheet History Recorded in Ocean Sediments". Polarforschung. 80 (3): 141–159. hdl:10013/epic.38391.
  8. ^ a b Contoux, C.; Dumas, C.; Ramstein, G.; Jost, A.; Dolan, A.M. (15 August 2015). "Modelling Greenland ice sheet inception and sustainability during the Late Pliocene" (PDF). Earth and Planetary Science Letters. 424: 295–305. Bibcode:2015E&PSL.424..295C. doi:10.1016/j.epsl.2015.05.018. Archived (PDF) from the original on 8 November 2020. Retrieved 7 December 2023.
  9. ^ a b c Knutz, Paul C.; Newton, Andrew M. W.; Hopper, John R.; Huuse, Mads; Gregersen, Ulrik; Sheldon, Emma; Dybkjær, Karen (15 April 2019). "Eleven phases of Greenland Ice Sheet shelf-edge advance over the past 2.7 million years" (PDF). Nature Geoscience. 12 (5): 361–368. Bibcode:2019NatGe..12..361K. doi:10.1038/s41561-019-0340-8. S2CID 146504179. Archived (PDF) from the original on 20 December 2023. Retrieved 7 December 2023.
  10. ^ a b c Robinson, Ben (15 April 2019). "Scientists chart history of Greenland Ice Sheet for first time". The University of Manchester. Archived from the original on 7 December 2023. Retrieved 7 December 2023.
  11. ^ a b c Reyes, Alberto V.; Carlson, Anders E.; Beard, Brian L.; Hatfield, Robert G.; Stoner, Joseph S.; Winsor, Kelsey; Welke, Bethany; Ullman, David J. (25 June 2014). "South Greenland ice-sheet collapse during Marine Isotope Stage 11". Nature. 510 (7506): 525–528. Bibcode:2014Natur.510..525R. doi:10.1038/nature13456. PMID 24965655. S2CID 4468457.
  12. ^ a b Christ, Andrew J.; Bierman, Paul R.; Schaefer, Joerg M.; Dahl-Jensen, Dorthe; Steffensen, Jørgen P.; Corbett, Lee B.; Peteet, Dorothy M.; Thomas, Elizabeth K.; Steig, Eric J.; Rittenour, Tammy M.; Tison, Jean-Louis; Blard, Pierre-Henri; Perdrial, Nicolas; Dethier, David P.; Lini, Andrea; Hidy, Alan J.; Caffee, Marc W.; Southon, John (30 March 2021). "A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century". Proceedings of the National Academy of Sciences. 118 (13): e2021442118. Bibcode:2021PNAS..11821442C. doi:10.1073/pnas.2021442118. ISSN 0027-8424. PMC 8020747. PMID 33723012.
  13. ^ a b c d e Gautier, Agnieszka (29 March 2023). "How and when did the Greenland Ice Sheet form?". National Snow and Ice Data Center. Archived from the original on 28 May 2023. Retrieved 5 December 2023.
  14. ^ a b Yau, Audrey M.; Bender, Michael L.; Blunier, Thomas; Jouzel, Jean (15 July 2016). "Setting a chronology for the basal ice at Dye-3 and GRIP: Implications for the long-term stability of the Greenland Ice Sheet". Earth and Planetary Science Letters. 451: 1–9. Bibcode:2016E&PSL.451....1Y. doi:10.1016/j.epsl.2016.06.053.
  15. ^ a b Hörhold, M.; Münch, T.; Weißbach, S.; Kipfstuhl, S.; Freitag, J.; Sasgen, I.; Lohmann, G.; Vinther, B.; Laepple, T. (18 January 2023). "Modern temperatures in central–north Greenland warmest in past millennium". Nature. 613 (7506): 525–528. Bibcode:2014Natur.510..525R. doi:10.1038/nature13456. PMID 24965655. S2CID 4468457.
  16. ^ a b Briner, Jason P.; Cuzzone, Joshua K.; Badgeley, Jessica A.; Young, Nicolás E.; Steig, Eric J.; Morlighem, Mathieu; Schlegel, Nicole-Jeanne; Hakim, Gregory J.; Schaefer, Joerg M.; Johnson, Jesse V.; Lesnek, Alia J.; Thomas, Elizabeth K.; Allan, Estelle; Bennike, Ole; Cluett, Allison A.; Csatho, Beata; de Vernal, Anne; Downs, Jacob; Larour, Eric; Nowicki, Sophie (30 September 2020). "Rate of mass loss from the Greenland Ice Sheet will exceed Holocene values this century". Nature. 586 (7827): 70–74. Bibcode:2020Natur.586...70B. doi:10.1038/s41586-020-2742-6. PMID 32999481. S2CID 222147426.
  17. ^ a b "Special Report on the Ocean and Cryosphere in a Changing Climate: Executive Summary". IPCC. Archived from the original on 8 November 2023. Retrieved 5 December 2023.
  18. ^ a b Stendel, Martin; Mottram, Ruth (22 September 2022). "Guest post: How the Greenland ice sheet fared in 2022". Carbon Brief. Archived from the original on 22 October 2022. Retrieved 22 October 2022.
  19. ^ a b c d Fox-Kemper, B.; Hewitt, H.T.; Xiao, C.; Aðalgeirsdóttir, G.; Drijfhout, S.S.; Edwards, T.L.; Golledge, N.R.; Hemer, M.; Kopp, R.E.; Krinner, G.; Mix, A. (2021). Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S.L.; Péan, C.; Berger, S.; Caud, N.; Chen, Y.; Goldfarb, L. (eds.). "Chapter 9: Ocean, Cryosphere and Sea Level Change" (PDF). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK and New York, NY, US. Archived (PDF) from the original on 24 October 2022. Retrieved 22 October 2022.
  20. ^ a b c d Aschwanden, Andy; Fahnestock, Mark A.; Truffer, Martin; Brinkerhoff, Douglas J.; Hock, Regine; Khroulev, Constantine; Mottram, Ruth; Khan, S. Abbas (19 June 2019). "Contribution of the Greenland Ice Sheet to sea level over the next millennium". Science Advances. 5 (6): 218–222. Bibcode:2019SciA....5.9396A. doi:10.1126/sciadv.aav9396. PMC 6584365. PMID 31223652.
  21. ^ a b c d e f Mouginot, Jérémie; Rignot, Eric; Bjørk, Anders A.; van den Broeke, Michiel; Millan, Romain; Morlighem, Mathieu; Noël, Brice; Scheuchl, Bernd; Wood, Michael (20 March 2019). "Forty-six years of Greenland Ice Sheet mass balance from 1972 to 2018". Proceedings of the National Academy of Sciences. 116 (19): 9239–9244. Bibcode:2019PNAS..116.9239M. doi:10.1073/pnas.1904242116. PMC 6511040. PMID 31010924.
  22. ^ IPCC, 2021: Summary for Policymakers Archived 11 August 2021 at the Wayback Machine. In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Archived 26 May 2023 at the Wayback Machine [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, US, pp. 3–32, doi:10.1017/9781009157896.001.
  23. ^ a b Christ, Andrew J.; Rittenour, Tammy M.; Bierman, Paul R.; Keisling, Benjamin A.; Knutz, Paul C.; Thomsen, Tonny B.; Keulen, Nynke; Fosdick, Julie C.; Hemming, Sidney R.; Tison, Jean-Louis; Blard, Pierre-Henri; Steffensen, Jørgen P.; Caffee, Marc W.; Corbett, Lee B.; Dahl-Jensen, Dorthe; Dethier, David P.; Hidy, Alan J.; Perdrial, Nicolas; Peteet, Dorothy M.; Steig, Eric J.; Thomas, Elizabeth K. (20 July 2023). "Deglaciation of northwestern Greenland during Marine Isotope Stage 11". Science. 381 (6655): 330–335. Bibcode:2023Sci...381..330C. doi:10.1126/science.ade4248. PMID 37471537. S2CID 259985096.
  24. ^ a b c d Armstrong McKay, David; Abrams, Jesse; Winkelmann, Ricarda; Sakschewski, Boris; Loriani, Sina; Fetzer, Ingo; Cornell, Sarah; Rockström, Johan; Staal, Arie; Lenton, Timothy (9 September 2022). "Exceeding 1.5°C global warming could trigger multiple climate tipping points". Science. 377 (6611): eabn7950. doi:10.1126/science.abn7950. hdl:10871/131584. ISSN 0036-8075. PMID 36074831. S2CID 252161375. Archived from the original on 14 November 2022. Retrieved 22 October 2022.
  25. ^ a b c d Armstrong McKay, David (9 September 2022). "Exceeding 1.5°C global warming could trigger multiple climate tipping points – paper explainer". climatetippingpoints.info. Archived from the original on 18 July 2023. Retrieved 2 October 2022.
  26. ^ Strunk, Astrid; Knudsen, Mads Faurschou; Egholm, David L. E; Jansen, John D.; Levy, Laura B.; Jacobsen, Bo H.; Larsen, Nicolaj K. (18 January 2017). "One million years of glaciation and denudation history in west Greenland". Nature Communications. 8: 14199. Bibcode:2017NatCo...814199S. doi:10.1038/ncomms14199. PMC 5253681. PMID 28098141.
  27. ^ Aschwanden, Andy; Fahnestock, Mark A.; Truffer, Martin (1 February 2016). "Complex Greenland outlet glacier flow captured". Nature Communications. 7: 10524. Bibcode:2016NatCo...710524A. doi:10.1038/ncomms10524. PMC 4740423. PMID 26830316.
  28. ^ a b Khan, Shfaqat A.; Bjørk, Anders A.; Bamber, Jonathan L.; Morlighem, Mathieu; Bevis, Michael; Kjær, Kurt H.; Mouginot, Jérémie; Løkkegaard, Anja; Holland, David M.; Aschwanden, Andy; Zhang, Bao; Helm, Veit; Korsgaard, Niels J.; Colgan, William; Larsen, Nicolaj K.; Liu, Lin; Hansen, Karina; Barletta, Valentina; Dahl-Jensen, Trine S.; Søndergaard, Anne Sofie; Csatho, Beata M.; Sasgen, Ingo; Box, Jason; Schenk, Toni (17 November 2020). "Centennial response of Greenland's three largest outlet glaciers". Nature Communications. 11 (1): 5718. Bibcode:2020NatCo..11.5718K. doi:10.1038/s41467-020-19580-5. PMC 7672108. PMID 33203883.
  29. ^ a b Japsen, Peter; Green, Paul F.; Bonow, Johan M.; Nielsen, Troels F.D.; Chalmers, James A. (5 February 2014). "From volcanic plains to glaciated peaks: Burial, uplift and exhumation history of southern East Greenland after opening of the NE Atlantic". Global and Planetary Change. 116: 91–114. Bibcode:2014GPC...116...91J. doi:10.1016/j.gloplacha.2014.01.012.
  30. ^ a b Solgaard, Anne M.; Bonow, Johan M.; Langen, Peter L.; Japsen, Peter; Hvidberg, Christine (27 September 2013). "Mountain building and the initiation of the Greenland Ice Sheet". Palaeogeography, Palaeoclimatology, Palaeoecology. 392: 161–176. Bibcode:2013PPP...392..161S. doi:10.1016/j.palaeo.2013.09.019.
  31. ^ Koenig, S. J.; Dolan, A. M.; de Boer, B.; Stone, E. J.; Hill, D. J.; DeConto, R. M.; Abe-Ouchi, A.; Lunt, D. J.; Pollard, D.; Quiquet, A.; Saito, F.; Savage, J.; van de Wal, R. (5 March 2015). "Ice sheet model dependency of the simulated Greenland Ice Sheet in the mid-Pliocene". Climate of the Past. 11 (3): 369–381. Bibcode:2015CliPa..11..369K. doi:10.5194/cp-11-369-2015.
  32. ^ Yang, Hu; Krebs-Kanzow, Uta; Kleiner, Thomas; Sidorenko, Dmitry; Rodehacke, Christian Bernd; Shi, Xiaoxu; Gierz, Paul; Niu, Lu J.; Gowan, Evan J.; Hinck, Sebastian; Liu, Xingxing; Stap, Lennert B.; Lohmann, Gerrit (20 January 2022). "Impact of paleoclimate on present and future evolution of the Greenland Ice Sheet". PLOS ONE. 17 (1): e0259816. Bibcode:2022PLoSO..1759816Y. doi:10.1371/journal.pone.0259816. PMC 8776332. PMID 35051173.
  33. ^ Vinas, Maria-Jose (3 August 2016). "NASA Maps Thawed Areas Under Greenland Ice Sheet". NASA. Archived from the original on 12 December 2023. Retrieved 12 December 2023.
  34. ^ a b c Irvalı, Nil; Galaasen, Eirik V.; Ninnemann, Ulysses S.; Rosenthal, Yair; Born, Andreas; Kleiven, Helga (Kikki) F. (18 December 2019). "A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene". Proceedings of the National Academy of Sciences. 117 (1): 190–195. doi:10.1073/pnas.1911902116. ISSN 0027-8424. PMC 6955352. PMID 31871153.
  35. ^ a b Schaefer, Joerg M.; Finkel, Robert C.; Balco, Greg; Alley, Richard B.; Caffee, Marc W.; Briner, Jason P.; Young, Nicolas E.; Gow, Anthony J.; Schwartz, Roseanne (7 December 2016). "Greenland was nearly ice-free for extended periods during the Pleistocene". Nature. 540 (7632): 252–255. Bibcode:2016Natur.540..252S. doi:10.1038/nature20146. PMID 27929018. S2CID 4471742.
  36. ^ Alley, Richard B (2000). The Two-Mile Time Machine: Ice Cores, Abrupt Climate Change, and Our Future. Princeton University Press. ISBN 0-691-00493-5.
  37. ^ a b Gkinis, V.; Simonsen, S. B.; Buchardt, S. L.; White, J. W. C.; Vinther, B. M. (1 November 2014). "Water isotope diffusion rates from the NorthGRIP ice core for the last 16,000 years – Glaciological and paleoclimatic implications". Earth and Planetary Science Letters. 405: 132–141. arXiv:1404.4201. Bibcode:2014E&PSL.405..132G. doi:10.1016/j.epsl.2014.08.022.
  38. ^ a b Adolphi, Florian; Muscheler, Raimund; Svensson, Anders; Aldahan, Ala; Possnert, Göran; Beer, Jürg; Sjolte, Jesper; Björck, Svante; Matthes, Katja; Thiéblemont, Rémi (17 August 2014). "Persistent link between solar activity and Greenland climate during the Last Glacial Maximum". Nature Geoscience. 7 (9): 662–666. Bibcode:2014NatGe...7..662A. doi:10.1038/ngeo2225.
  39. ^ a b Kurosaki, Yutaka; Matoba, Sumito; Iizuka, Yoshinori; Fujita, Koji; Shimada, Rigen (26 December 2022). "Increased oceanic dimethyl sulfide emissions in areas of sea ice retreat inferred from a Greenland ice core". Communications Earth & Environment. 3 (1): 327. Bibcode:2022ComEE...3..327K. doi:10.1038/s43247-022-00661-w. ISSN 2662-4435. Text and images are available under a Creative Commons Attribution 4.0 International License Archived 16 October 2017 at the Wayback Machine.
  40. ^ Masson-Delmotte, V.; Jouzel, J.; Landais, A.; Stievenard, M.; Johnsen, S. J.; White, J. W. C.; Werner, M.; Sveinbjornsdottir, A.; Fuhrer, K. (1 July 2005). "GRIP Deuterium Excess Reveals Rapid and Orbital-Scale Changes in Greenland Moisture Origin" (PDF). Science. 309 (5731): 118–121. Bibcode:2005Sci...309..118M. doi:10.1126/science.1108575. PMID 15994553. S2CID 10566001. Archived (PDF) from the original on 19 May 2022. Retrieved 13 December 2023.
  41. ^ Zielinski, G. A.; Mayewski, P. A.; Meeker, L. D.; Whitlow, S.; Twickler, M. S.; Morrison, M.; Meese, D. A.; Gow, A. J.; Alley, R. B. (13 May 1994). "Record of Volcanism Since 7000 B.C. from the GISP2 Greenland Ice Core and Implications for the Volcano-Climate System". Science. 264 (5161): 948–952. Bibcode:1994Sci...264..948Z. doi:10.1126/science.264.5161.948. PMID 17830082. S2CID 21695750.
  42. ^ Fischer, Hubertus; Schüpbach, Simon; Gfeller, Gideon; Bigler, Matthias; Röthlisberger, Regine; Erhardt, Tobias; Stocker, Thomas F.; Mulvaney, Robert; Wolff, Eric W. (10 August 2015). "Millennial changes in North American wildfire and soil activity over the last glacial cycle" (PDF). Nature Geoscience. 8 (9): 723–727. Bibcode:2015NatGe...8..723F. doi:10.1038/ngeo2495. Archived (PDF) from the original on 3 December 2023. Retrieved 13 December 2023.
  43. ^ Wood, J.R. (21 October 2022). "Other ways to examine the finances behind the birth of Classical Greece". Archaeometry. 65 (3): 570–586. doi:10.1111/arcm.12839.
  44. ^ McConnell, Joseph R.; Wilson, Andrew I.; Stohl, Andreas; Arienzo, Monica M.; Chellman, Nathan J.; Eckhardt, Sabine; Thompson, Elisabeth M.; Pollard, A. Mark; Steffensen, Jørgen Peder (29 May 2018). "Lead pollution recorded in Greenland ice indicates European emissions tracked plagues, wars, and imperial expansion during antiquity". Proceedings of the National Academy of Sciences. 115 (22): 5726–5731. Bibcode:2018PNAS..115.5726M. doi:10.1073/pnas.1721818115. PMC 5984509. PMID 29760088.
  45. ^ a b c d "Arctic Climate Impact Assessment". Archived from the original on 14 December 2010. Retrieved 23 February 2006.
  46. ^ "Arctic Climate Impact Assessment". Union of Concerned Scientists. 16 July 2008. Archived from the original on 5 December 2023. Retrieved 5 December 2023.
  47. ^ Vinther, B. M.; Andersen, K. K.; Jones, P. D.; Briffa, K. R.; Cappelen, J. (6 June 2006). "Extending Greenland temperature records into the late eighteenth century" (PDF). Journal of Geophysical Research. 111 (D11): D11105. Bibcode:2006JGRD..11111105V. doi:10.1029/2005JD006810. Archived (PDF) from the original on 23 February 2011. Retrieved 10 July 2007.
  48. ^ Kjeldsen, Kristian K.; Korsgaard, Niels J.; Bjørk, Anders A.; Khan, Shfaqat A.; Box, Jason E.; Funder, Svend; Larsen, Nicolaj K.; Bamber, Jonathan L.; Colgan, William; van den Broeke, Michiel; Siggaard-Andersen, Marie-Louise; Nuth, Christopher; Schomacker, Anders; Andresen, Camilla S.; Willerslev, Eske; Kjær, Kurt H. (16 December 2015). "Spatial and temporal distribution of mass loss from the Greenland Ice Sheet since AD 1900". Nature. 528 (7582): 396–400. Bibcode:2015Natur.528..396K. doi:10.1038/nature16183. hdl:1874/329934. PMID 26672555. S2CID 4468824.
  49. ^ Frederikse, Thomas; Landerer, Felix; Caron, Lambert; Adhikari, Surendra; Parkes, David; Humphrey, Vincent W.; Dangendorf, Sönke; Hogarth, Peter; Zanna, Laure; Cheng, Lijing; Wu, Yun-Hao (19 August 2020). "The causes of sea-level rise since 1900". Nature. 584 (7821): 393–397. doi:10.1038/s41586-020-2591-3. PMID 32814886. S2CID 221182575.
  50. ^ IPCC, 2007. Trenberth, K.E., P.D. Jones, P. Ambenje, R. Bojariu, D. Easterling, A. Klein Tank, D. Parker, F. Rahimzadeh, J.A. Renwick, M. Rusticucci, B. Soden and P. Zhai, 2007: Observations: Surface and Atmospheric Climate Change. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change [Solomon, S., D. Qin, M. Manning, Z. Chen, M. Marquis, K.B. Averyt, M. Tignor and H.L. Miller (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.[1] Archived 23 October 2017 at the Wayback Machine
  51. ^ Steffen, Konrad; Cullen, Nicloas; Huff, Russell (13 January 2005). Climate variability and trends along the western slope of the Greenland ice sheet during 1991-2004 (PDF). 85th American Meteorogical Union Annual Meeting. Archived from the original (PDF) on 14 June 2007.
  52. ^ a b Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) [Houghton, J.T., Y. Ding, D.J. Griggs, M. Noguer, P.J. van der Linden, X. Dai, K. Maskell, and C.A. Johnson (eds.)]Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 881pp. [2] Archived 16 December 2007 at the Wayback Machine, "Climate Change 2001: The Scientific Basis". Archived from the original on 10 February 2006. Retrieved 10 February 2006., and [3] Archived 19 January 2017 at the Wayback Machine.
  53. ^ a b c Shepherd, Andrew; Ivins, Erik; Rignot, Eric; Smith, Ben; van den Broeke, Michiel; Velicogna, Isabella; Whitehouse, Pippa; Briggs, Kate; Joughin, Ian; Krinner, Gerhard; Nowicki, Sophie (12 March 2020). "Mass balance of the Greenland Ice Sheet from 1992 to 2018". Nature. 579 (7798): 233–239. doi:10.1038/s41586-019-1855-2. hdl:2268/242139. ISSN 1476-4687. PMID 31822019. S2CID 219146922. Archived from the original on 23 October 2022. Retrieved 23 October 2022.
  54. ^ a b "Record melt: Greenland lost 586 billion tons of ice in 2019". phys.org. Archived from the original on 13 September 2020. Retrieved 6 September 2020.
  55. ^ Bamber, Jonathan L; Westaway, Richard M; Marzeion, Ben; Wouters, Bert (1 June 2018). "The land ice contribution to sea level during the satellite era". Environmental Research Letters. 13 (6): 063008. Bibcode:2018ERL....13f3008B. doi:10.1088/1748-9326/aac2f0.
  56. ^ Xie, Aihong; Zhu, Jiangping; Kang, Shichang; Qin, Xiang; Xu, Bing; Wang, Yicheng (3 October 2022). "Polar amplification comparison among Earth's three poles under different socioeconomic scenarios from CMIP6 surface air temperature". Scientific Reports. 12 (1): 16548. Bibcode:2022NatSR..1216548X. doi:10.1038/s41598-022-21060-3. PMC 9529914. PMID 36192431.
  57. ^ Moon, Twila; Ahlstrøm, Andreas; Goelzer, Heiko; Lipscomb, William; Nowicki, Sophie (2018). "Rising Oceans Guaranteed: Arctic Land Ice Loss and Sea Level Rise". Current Climate Change Reports. 4 (3): 211–222. Bibcode:2018CCCR....4..211M. doi:10.1007/s40641-018-0107-0. ISSN 2198-6061. PMC 6428231. PMID 30956936.
  58. ^ a b c Choi, Youngmin; Morlighem, Mathieu; Rignot, Eric; Wood, Michael (4 February 2021). "Ice dynamics will remain a primary driver of Greenland ice sheet mass loss over the next century". Communications Earth & Environment. 2 (1): 26. Bibcode:2021ComEE...2...26C. doi:10.1038/s43247-021-00092-z. Text and images are available under a Creative Commons Attribution 4.0 International License Archived 16 October 2017 at the Wayback Machine.
  59. ^ Moon, Twila; Joughin, Ian (7 June 2008). "Changes in ice front position on Greenland's outlet glaciers from 1992 to 2007". Journal of Geophysical Research: Earth Surface. 113 (F2). Bibcode:2008JGRF..113.2022M. doi:10.1029/2007JF000927.
  60. ^ a b Sole, A.; Payne, T.; Bamber, J.; Nienow, P.; Krabill, W. (16 December 2008). "Testing hypotheses of the cause of peripheral thinning of the Greenland Ice Sheet: is land-terminating ice thinning at anomalously high rates?". The Cryosphere. 2 (2): 205–218. Bibcode:2008TCry....2..205S. doi:10.5194/tc-2-205-2008. ISSN 1994-0424. S2CID 16539240.
  61. ^ Shukman, David (28 July 2004). "Greenland ice-melt 'speeding up'". The BBC. Archived from the original on 22 December 2023. Retrieved 22 December 2023.
  62. ^ a b c Connor, Steve (25 July 2005). "Melting Greenland glacier may hasten rise in sea level". The Independent. Archived from the original on 27 July 2005. Retrieved 30 April 2010.
  63. ^ Thomas, Robert H.; Abdalati, Waleed; Akins, Torry L.; Csatho, Beata M.; Frederick, Earl B.; Gogineni, Siva P.; Krabill, William B.; Manizade, Serdar S.; Rignot, Eric J. (1 May 2000). "Substantial thinning of a major east Greenland outlet glacier". Geophysical Research Letters. 27 (9): 1291–1294. Bibcode:2000GeoRL..27.1291T. doi:10.1029/1999GL008473.
  64. ^ Howat, Ian M.; Ahn, Yushin; Joughin, Ian; van den Broeke, Michiel R.; Lenaerts, Jan T. M.; Smith, Ben (18 June 2011). "Mass balance of Greenland's three largest outlet glaciers, 2000–2010". Geophysical Research Letters. 27 (9). Bibcode:2000GeoRL..27.1291T. doi:10.1029/1999GL008473.
  65. ^ Barnett, Jamie; Holmes, Felicity A.; Kirchner, Nina (23 August 2022). "Modelled dynamic retreat of Kangerlussuaq Glacier, East Greenland, strongly influenced by the consecutive absence of an ice mélange in Kangerlussuaq Fjord". Journal of Glaciology. 59 (275): 433–444. doi:10.1017/jog.2022.70.
  66. ^ "Ilulissat Icefjord". UNESCO World Heritage Centre. United Nations Educational, Scientific, and Cultural Organization. Archived from the original on 24 December 2018. Retrieved 19 June 2021.
  67. ^ a b c Joughin, Ian; Abdalati, Waleed; Fahnestock, Mark (December 2004). "Large fluctuations in speed on Greenland's Jakobshavn Isbræ glacier". Nature. 432 (7017): 608–610. Bibcode:2004Natur.432..608J. doi:10.1038/nature03130. PMID 15577906. S2CID 4406447.
  68. ^ a b Pelto.M, Hughes, T, Fastook J., Brecher, H. (1989). "Equilibrium state of Jakobshavns Isbræ, West Greenland". Annals of Glaciology. 12: 781–783. Bibcode:1989AnGla..12..127P. doi:10.3189/S0260305500007084.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  69. ^ a b "Fastest Glacier doubles in Speed". NASA. Archived from the original on 19 June 2006. Retrieved 2 February 2009.
  70. ^ "Images Show Breakup of Two of Greenland's Largest Glaciers, Predict Disintegration in Near Future". NASA Earth Observatory. 20 August 2008. Archived from the original on 31 August 2008. Retrieved 31 August 2008.
  71. ^ Hickey, Hannah; Ferreira, Bárbara (3 February 2014). "Greenland's fastest glacier sets new speed record". University of Washington. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
  72. ^ Rasmussen, Carol (25 March 2019). "Cold Water Currently Slowing Fastest Greenland Glacier". NASA/JPL. Archived from the original on 22 March 2022. Retrieved 23 December 2023.
  73. ^ a b Khazendar, Ala; Fenty, Ian G.; Carroll, Dustin; Gardner, Alex; Lee, Craig M.; Fukumori, Ichiro; Wang, Ou; Zhang, Hong; Seroussi, Hélène; Moller, Delwyn; Noël, Brice P. Y.; Van Den Broeke, Michiel R.; Dinardo, Steven; Willis, Josh (25 March 2019). "Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools". Nature Geoscience. 12 (4): 277–283. Bibcode:2019NatGe..12..277K. doi:10.1038/s41561-019-0329-3. hdl:1874/379731. S2CID 135428855.
  74. ^ "Huge ice island breaks from Greenland glacier". BBC News. 7 August 2010. Archived from the original on 8 April 2018. Retrieved 21 July 2018.
  75. ^ "Iceberg twice the size of Manhattan breaks off Greenland glacier". Canadian Broadcasting Corporation. The Associated Press. 18 July 2012. Archived from the original on 31 July 2013. Retrieved 22 December 2023.
  76. ^ Åkesson, Henning; Morlighem, Mathieu; Nilsson, Johan; Stranne, Christian; Jakobsson, Martin (9 May 2022). "Petermann ice shelf may not recover after a future breakup". Nature Communications. 13: 2519. Bibcode:2022NatCo..13.2519A. doi:10.1038/s41467-022-29529-5.
  77. ^ Enderlin, Ellyn M.; Howat, Ian M.; Jeong, Seongsu; Noh, Myoung-Jong; van Angelen, Jan H.; van den Broeke, Michiel (16 January 2014). "An improved mass budget for the Greenland ice sheet". Geophysical Research Letters. 41 (3): 866–872. Bibcode:2014GeoRL..41..866E. doi:10.1002/2013GL059010.
  78. ^ Howat, I. M.; Joughin, I.; Tulaczyk, S.; Gogineni, S. (22 November 2005). "Rapid retreat and acceleration of Helheim Glacier, east Greenland". Geophysical Research Letters. 32 (22). Bibcode:2005GeoRL..3222502H. doi:10.1029/2005GL024737.
  79. ^ Nettles, Meredith; Ekström, Göran (1 April 2010). "Glacial Earthquakes in Greenland and Antarctica". Annual Review of Earth and Planetary Sciences. 38 (1): 467–491. Bibcode:2010AREPS..38..467N. doi:10.1146/annurev-earth-040809-152414. ISSN 0084-6597.
  80. ^ Kehrl, L. M.; Joughin, I.; Shean, D. E.; Floricioiu, D.; Krieger, L. (17 August 2017). "Seasonal and interannual variabilities in terminus position, glacier velocity, and surface elevation at Helheim and Kangerlussuaq Glaciers from 2008 to 2016" (PDF). Journal of Geophysical Research: Earth Surface. 122 (9): 1635–1652. Bibcode:2017JGRF..122.1635K. doi:10.1002/2016JF004133. S2CID 52086165. Archived (PDF) from the original on 17 November 2023. Retrieved 22 December 2023.
  81. ^ Williams, Joshua J.; Gourmelen, Noel; Nienow, Peter; Bunce, Charlie; Slater, Donald (24 November 2021). "Helheim Glacier Poised for Dramatic Retreat". Geophysical Research Letters. 35 (17). Bibcode:2021GeoRL..4894546W. doi:10.1029/2021GL094546.
  82. ^ Howat, Ian M.; Smith, Ben E.; Joughin, Ian; Scambos, Ted A. (9 September 2008). "Rates of southeast Greenland ice volume loss from combined ICESat and ASTER observations". Geophysical Research Letters. 35 (17). Bibcode:2008GeoRL..3517505H. doi:10.1029/2008gl034496. ISSN 0094-8276. S2CID 3468378.
  83. ^ Larocca, L. J.; Twining–Ward, M.; Axford, Y.; Schweinsberg, A. D.; Larsen, S. H.; Westergaard–Nielsen, A.; Luetzenburg, G.; Briner, J. P.; Kjeldsen, K. K.; Bjørk, A. A. (9 November 2023). "Greenland-wide accelerated retreat of peripheral glaciers in the twenty-first century". Nature Climate Change. 13 (12): 1324–1328. Bibcode:2023NatCC..13.1324L. doi:10.1038/s41558-023-01855-6.
  84. ^ Morris, Amanda (9 November 2023). "Greenland's glacier retreat rate has doubled over past two decades". Northwestern University. Archived from the original on 22 December 2023. Retrieved 22 December 2023.
  85. ^ a b Ciracì, Enrico; Rignot, Eric; Scheuchl, Bernd (8 May 2023). "Melt rates in the kilometer-size grounding zone of Petermann Glacier, Greenland, before and during a retreat". PNAS. 120 (20): e2220924120. Bibcode:2023PNAS..12020924C. doi:10.1073/pnas.2220924120. PMC 10193949. PMID 37155853.
  86. ^ Rignot, Eric; Gogineni, Sivaprasad; Joughin, Ian; Krabill, William (1 December 2001). "Contribution to the glaciology of northern Greenland from satellite radar interferometry". Journal of Geophysical Research: Atmospheres. 106 (D24): 34007–34019. Bibcode:2001JGR...10634007R. doi:10.1029/2001JD900071.
  87. ^ Rignot, E.; Braaten, D.; Gogineni, S.; Krabill, W.; McConnell, J. R. (25 May 2004). "Rapid ice discharge from southeast Greenland glaciers". Geophysical Research Letters. 31 (10). Bibcode:2004GeoRL..3110401R. doi:10.1029/2004GL019474.
  88. ^ Luckman, Adrian; Murray, Tavi; de Lange, Remko; Hanna, Edward (3 February 2006). "Rapid and synchronous ice-dynamic changes in East Greenland". Geophysical Research Letters. 33 (3). Bibcode:2006GeoRL..33.3503L. doi:10.1029/2005gl025428. ISSN 0094-8276. S2CID 55517773.
  89. ^ Hughes, T. (1986). "The Jakobshavn Effect". Geophysical Research Letters. 13 (1): 46–48. Bibcode:1986GeoRL..13...46H. doi:10.1029/GL013i001p00046.
  90. ^ Thomas, Robert H. (2004). "Force-perturbation analysis of recent thinning and acceleration of Jakobshavn Isbræ, Greenland". Journal of Glaciology. 50 (168): 57–66. Bibcode:2004JGlac..50...57T. doi:10.3189/172756504781830321. ISSN 0022-1430. S2CID 128911716.
  91. ^ Thomas, Robert H.; Abdalati, Waleed; Frederick, Earl; Krabill, William; Manizade, Serdar; Steffen, Konrad (2003). "Investigation of surface melting and dynamic thinning on Jakobshavn Isbrae, Greenland". Journal of Glaciology. 49 (165): 231–239. Bibcode:2003JGlac..49..231T. doi:10.3189/172756503781830764.
  92. ^ Straneo, Fiammetta; Heimbach, Patrick (4 December 2013). "North Atlantic warming and the retreat of Greenland's outlet glaciers". Nature. 504 (7478): 36–43. Bibcode:2013Natur.504...36S. doi:10.1038/nature12854. PMID 24305146. S2CID 205236826.
  93. ^ Holland, D M.; Younn, B. D.; Ribergaard, M. H.; Lyberth, B. (28 September 2008). "Acceleration of Jakobshavn Isbrae triggered by warm ocean waters". Nature Geoscience. 1 (10): 659–664. Bibcode:2008NatGe...1..659H. doi:10.1038/ngeo316. S2CID 131559096.
  94. ^ Rignot, E.; Xu, Y.; Menemenlis, D.; Mouginot, J.; Scheuchl, B.; Li, X.; Morlighem, M.; Seroussi, H.; van den Broeke, M.; Fenty, I.; Cai, C.; An, L.; de Fleurian, B. (30 May 2016). "Modeling of ocean-induced ice melt rates of five west Greenland glaciers over the past two decades". Geophysical Research Letters. 43 (12): 6374–6382. Bibcode:2016GeoRL..43.6374R. doi:10.1002/2016GL068784. hdl:1874/350987. S2CID 102341541.
  95. ^ Clarke, Ted S.; Echelmeyer, Keith (1996). "Seismic-reflection evidence for a deep subglacial trough beneath Jakobshavns Isbræ, West Greenland". Journal of Glaciology. 43 (141): 219–232. doi:10.3189/S0022143000004081.
  96. ^ van der Veen, C.J.; Leftwich, T.; von Frese, R.; Csatho, B.M.; Li, J. (21 June 2007). "Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet". Geophysical Research Letters. L12501. 34 (12): 5 pp. Bibcode:2007GeoRL..3412501V. doi:10.1029/2007GL030046. hdl:1808/17298. S2CID 54213033. Archived from the original on 8 September 2011. Retrieved 16 January 2011.
  97. ^ Joughin, Ian; Shean, David E.; Smith, Benjamin E.; Floricioiu, Dana (24 January 2020). "A decade of variability on Jakobshavn Isbræ: ocean temperatures pace speed through influence on mélange rigidity". The Cryosphere. 14 (1): 211–227. Bibcode:2020TCry...14..211J. doi:10.5194/tc-14-211-2020. PMID 32355554.
  98. ^ Joughin, Ian; Howat, Ian; Alley, Richard B.; Ekstrom, Goran; Fahnestock, Mark; Moon, Twila; Nettles, Meredith; Truffer, Martin; Tsai, Victor C. (26 January 2008). "Ice-front variation and tidewater behavior on Helheim and Kangerdlugssuaq Glaciers, Greenland". Journal of Geophysical Research: Earth Surface. 113 (F1). Bibcode:2008JGRF..113.1004J. doi:10.1029/2007JF000837.
  99. ^ Miller, Brandon (8 May 2023). "A major Greenland glacier is melting away with the tide, which could signal faster sea level rise, study finds". CNN. Archived from the original on 16 June 2023. Retrieved 16 June 2023.
  100. ^ Zwally, H. Jay; Abdalati, Waleed; Herring, Tom; Larson, Kristine; Saba, Jack; Steffen, Konrad (12 July 2002). "Surface Melt-Induced Acceleration of Greenland Ice-Sheet Flow". Science. 297 (5579): 218–222. Bibcode:2002Sci...297..218Z. doi:10.1126/science.1072708. PMID 12052902. S2CID 37381126.
  101. ^ Pelto, M. (2008). "Moulins, Calving Fronts and Greenland Outlet Glacier Acceleration". RealClimate. Archived from the original on 27 July 2009. Retrieved 27 September 2008.
  102. ^ Das, Sarah B.; Joughin, Ian; Behn, Mark D.; Howat, Ian M.; King, Matt A.; Lizarralde, Dan; Bhatia, Maya P. (9 May 2008). "Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage". Science. 320 (5877): 778–781. Bibcode:2008Sci...320..778D. doi:10.1126/science.1153360. hdl:1912/2506. PMID 18420900. S2CID 41582882. Archived from the original on 7 March 2022. Retrieved 7 March 2022.
  103. ^ Thomas, R.; Frederick, E.; Krabill, W.; Manizade, S.; Martin, C. (2009). "Recent changes on Greenland outlet glaciers". Journal of Glaciology. 55 (189): 147–162. Bibcode:2009JGlac..55..147T. doi:10.3189/002214309788608958.
  104. ^ a b Slater, D. A.; Straneo, F. (3 October 2022). "Submarine melting of glaciers in Greenland amplified by atmospheric warming". Nature Geoscience. 15 (10): 794–799. Bibcode:2022NatGe..15..794S. doi:10.1038/s41561-022-01035-9.
  105. ^ Chauché, N.; Hubbard, A.; Gascard, J.-C.; Box, J. E.; Bates, R.; Koppes, M.; Sole, A.; Christoffersen, P.; Patton, H. (8 August 2014). "Ice–ocean interaction and calving front morphology at two west Greenland tidewater outlet glaciers". The Cryosphere. 8 (4): 1457–1468. Bibcode:2014TCry....8.1457C. doi:10.5194/tc-8-1457-2014.
  106. ^ Morlighem, Mathieu; Wood, Michael; Seroussi, Hélène; Choi, Youngmin; Rignot, Eric (1 March 2019). "Modeling the response of northwest Greenland to enhanced ocean thermal forcing and subglacial discharge". The Cryosphere. 13 (2): 723–734. Bibcode:2019TCry...13..723M. doi:10.5194/tc-13-723-2019.
  107. ^ Fried, M. J.; Catania, G. A.; Stearns, L. A.; Sutherland, D. A.; Bartholomaus, T. C.; Shroyer, E.; Nash, J. (10 July 2018). "Reconciling Drivers of Seasonal Terminus Advance and Retreat at 13 Central West Greenland Tidewater Glaciers". Journal of Geophysical Research: Earth Surface. 123 (7): 1590–1607. Bibcode:2018JGRF..123.1590F. doi:10.1029/2018JF004628.
  108. ^ Chandler, David M.; Hubbard, Alun (19 June 2023). "Widespread partial-depth hydrofractures in ice sheets driven by supraglacial streams". Nature Geoscience. 37 (20): 605–611. Bibcode:2023NatGe..16..605C. doi:10.1038/s41561-023-01208-0.
  109. ^ Phillips, Thomas; Rajaram, Harihar; Steffen, Konrad (23 October 2010). "Cryo-hydrologic warming: A potential mechanism for rapid thermal response of ice sheets". Geophysical Research Letters. 48 (15): e2021GL092942. Bibcode:2010GeoRL..3720503P. doi:10.1029/2010GL044397. S2CID 129678617.
  110. ^ Hubbard, Alun (29 June 2023). "Meltwater is infiltrating Greenland's ice sheet through millions of hairline cracks – destabilizing its structure". The Conversation. Archived from the original on 22 December 2023. Retrieved 22 December 2023.
  111. ^ "Satellite shows Greenland's ice sheets getting thicker". The Register. 7 November 2005. Archived from the original on 1 September 2017.
  112. ^ Mooney, Chris (29 August 2022). "Greenland ice sheet set to raise sea levels by nearly a foot, study finds". The Washington Post. Archived from the original on 29 August 2022. Retrieved 29 August 2022. As it thaws, scientists think the change will manifest itself at a location called the snow line. This is the dividing line between the high altitude, bright white parts of the ice sheet that accumulate snow and mass even during the summer, and the darker, lower elevation parts that melt and contribute water to the sea. This line moves every year, depending on how warm or cool the summer is, tracking how much of Greenland melts in a given period.
  113. ^ Ryan, J. C.; Smith, L. C.; van As, D.; Cooley, S. W.; Cooper, M. G.; Pitcher, L. H.; Hubbard, A. (6 March 2019). "Greenland Ice Sheet surface melt amplified by snowline migration and bare ice exposure". Science Advances. 5 (3): 218–222. Bibcode:2019SciA....5.3738R. doi:10.1126/sciadv.aav3738. PMC 6402853. PMID 30854432.
  114. ^ "Glacier Girl: The Back Story". Air & Space Magazine. Smithsonian Institution. Archived from the original on 21 June 2020. Retrieved 21 June 2020.
  115. ^ Wattles, Jackie (14 October 2020). "How investigators found a jet engine under Greenland's ice sheet". CNN Business. Archived from the original on 26 April 2023.
  116. ^ McPherson, Rebecca Adam; Wekerle, Claudia; Kanzow, Torsten; Ionita, Monica; Heukamp, Finn Ole; Zeising, Ole; Humbert, Angelika (20 September 2024). "Atmospheric blocking slows ocean-driven melting of Greenland's largest glacier tongue". Science. 385 (6715): 1360–1366. doi:10.1126/science.ado5008.
  117. ^ a b Lewis, Gabriel; Osterberg, Erich; Hawley, Robert; Marshall, Hans Peter; Meehan, Tate; Graeter, Karina; McCarthy, Forrest; Overly, Thomas; Thundercloud, Zayta; Ferris, David (4 November 2019). "Recent precipitation decrease across the western Greenland ice sheet percolation zone". The Cryosphere. 13 (11): 2797–2815. Bibcode:2019TCry...13.2797L. doi:10.5194/tc-13-2797-2019. Archived from the original on 22 January 2022. Retrieved 7 March 2022.
  118. ^ Bales, Roger C.; Guo, Qinghua; Shen, Dayong; McConnell, Joseph R.; Du, Guoming; Burkhart, John F.; Spikes, Vandy B.; Hanna, Edward; Cappelen, John (27 March 2009). "Annual accumulation for Greenland updated using ice core data developed during 2000–2006 and analysis of daily coastal meteorological data" (PDF). Journal of Geophysical Research: Atmospheres. 114 (D6). Bibcode:2009JGRD..114.6116B. doi:10.1029/2008JD011208. Archived (PDF) from the original on 3 December 2023. Retrieved 13 December 2023.
  119. ^ Auger, Jeffrey D.; Birkel, Sean D.; Maasch, Kirk A.; Mayewski, Paul A.; Schuenemann, Keah C. (6 June 2017). "Examination of precipitation variability in southern Greenland". Journal of Geophysical Research: Atmospheres. 122 (12): 6202–6216. Bibcode:2017JGRD..122.6202A. doi:10.1002/2016JD026377.
  120. ^ Niwano, M.; Box, J. E.; Wehrlé, A.; Vandecrux, B.; Colgan, W. T.; Cappelen, J. (3 July 2021). "Rainfall on the Greenland Ice Sheet: Present-Day Climatology From a High-Resolution Non-Hydrostatic Polar Regional Climate Model". Geophysical Research Letters. 48 (15): e2021GL092942. Bibcode:2021GeoRL..4892942N. doi:10.1029/2021GL092942.
  121. ^ Doyle, Samuel H.; Hubbard, Alun; van de Wal, Roderik S. W.; Box, Jason E.; van As, Dirk; Scharrer, Kilian; Meierbachtol, Toby W.; Smeets, Paul C. J. P.; Harper, Joel T.; Johansson, Emma; Mottram, Ruth H.; Mikkelsen, Andreas B.; Wilhelms, Frank; Patton, Henry; Christoffersen, Poul; Hubbard, Bryn (13 July 2015). "Amplified melt and flow of the Greenland ice sheet driven by late-summer cyclonic rainfall". Nature Geoscience. 8 (8): 647–653. Bibcode:2015NatGe...8..647D. doi:10.1038/ngeo2482. hdl:1874/321802. S2CID 130094002.
  122. ^ Mattingly, Kyle S.; Ramseyer, Craig A.; Rosen, Joshua J.; Mote, Thomas L.; Muthyala, Rohi (22 August 2016). "Increasing water vapor transport to the Greenland Ice Sheet revealed using self-organizing maps". Geophysical Research Letters. 43 (17): 9250–9258. Bibcode:2016GeoRL..43.9250M. doi:10.1002/2016GL070424. S2CID 132714399.
  123. ^ "Greenland enters melt mode". Science News. 23 September 2013. Archived from the original on 5 August 2012. Retrieved 14 August 2012.
  124. ^ "Arctic Report Card: Update for 2012; Greenland Ice Sheet" (PDF). 2012. Archived (PDF) from the original on 19 January 2022. Retrieved 7 March 2022.
  125. ^ Barnes, Adam (9 August 2021). "'Massive melting event' torpedoes billions of tons of ice the whole world depends on". The Hill. Archived from the original on 25 August 2021. Retrieved 24 August 2021. Ice cores show that these widespread melt events were really rare prior to the 21st century, but since then, we have had several melt seasons.
  126. ^ Van Tricht, K.; Lhermitte, S.; Lenaerts, J. T. M.; Gorodetskaya, I. V.; L'Ecuyer, T. S.; Noël, B.; van den Broeke, M. R.; Turner, D. D.; van Lipzig, N. P. M. (12 January 2016). "Clouds enhance Greenland ice sheet meltwater runoff". Nature Communications. 7: 10266. Bibcode:2016NatCo...710266V. doi:10.1038/ncomms10266. PMC 4729937. PMID 26756470.
  127. ^ Mikkelsen, Andreas Bech; Hubbard, Alun; MacFerrin, Mike; Box, Jason Eric; Doyle, Sam H.; Fitzpatrick, Andrew; Hasholt, Bent; Bailey, Hannah L.; Lindbäck, Katrin; Pettersson, Rickard (30 May 2016). "Extraordinary runoff from the Greenland ice sheet in 2012 amplified by hypsometry and depleted firn retention". The Cryosphere. 10 (3): 1147–1159. Bibcode:2016TCry...10.1147M. doi:10.5194/tc-10-1147-2016.
  128. ^ Bennartz, R.; Shupe, M. D.; Turner, D. D.; Walden, V. P.; Steffen, K.; Cox, C. J.; Kulie, M. S.; Miller, N. B.; Pettersen, C. (3 April 2013). "July 2012 Greenland melt extent enhanced by low-level liquid clouds". Nature. 496 (7443): 83–86. Bibcode:2013Natur.496...83B. doi:10.1038/nature12002. PMID 23552947. S2CID 4382849.
  129. ^ Revkin, Andrew C. (25 July 2012). "'Unprecedented' Greenland Surface Melt – Every 150 Years?". The New York Times. Archived from the original on 3 January 2022. Retrieved 23 December 2023.
  130. ^ Meese, D. A.; Gow, A. J.; Grootes, P.; Stuiver, M.; Mayewski, P. A.; Zielinski, G. A.; Ram, M.; Taylor, K. C.; Waddington, E. D. (1994). "The Accumulation Record from the GISP2 Core as an Indicator of Climate Change Throughout the Holocene". Science. 266 (5191): 1680–1682. Bibcode:1994Sci...266.1680M. doi:10.1126/science.266.5191.1680. PMID 17775628. S2CID 12059819.
  131. ^ Sasgen, Ingo; Wouters, Bert; Gardner, Alex S.; King, Michalea D.; Tedesco, Marco; Landerer, Felix W.; Dahle, Christoph; Save, Himanshu; Fettweis, Xavier (20 August 2020). "Return to rapid ice loss in Greenland and record loss in 2019 detected by the GRACE-FO satellites". Communications Earth & Environment. 1 (1): 8. Bibcode:2020ComEE...1....8S. doi:10.1038/s43247-020-0010-1. ISSN 2662-4435. S2CID 221200001. Text and images are available under a Creative Commons Attribution 4.0 International License Archived 16 October 2017 at the Wayback Machine.
  132. ^ Milman, Oliver (30 July 2021). "Greenland: enough ice melted on single day to cover Florida in two inches of water". The Guardian. Archived from the original on 23 August 2021. Retrieved 24 August 2021. Greenland's vast ice sheet is undergoing a surge in melting...The deluge of melting has reached deep into Greenland's enormous icy interior, with data from the Danish government showing that the ice sheet lost 8.5bn tons of surface mass on Tuesday alone.
  133. ^ Turner, Ben (2 August 2021). "'Massive melting event' strikes Greenland after record heat wave". LiveScience.com. Archived from the original on 25 August 2021. Retrieved 24 August 2021. High temperatures on 28 July caused the third-largest single-day loss of ice in Greenland since 1950; the second and first biggest single-day losses occurred in 2012 and 2019. Greenland's yearly ice loss began in 1990. In recent years it has accelerated to roughly four times the levels before 2000.
  134. ^ Carrington, Damian (20 August 2021). "Rain falls on peak of Greenland ice cap for first time on record". The Guardian. Archived from the original on 21 December 2021. Retrieved 24 August 2021. Rain has fallen on the summit of Greenland's huge ice cap for the first time on record. Temperatures are normally well below freezing on the 3,216-metre (10,551ft) peak...Scientists at the US National Science Foundation's summit station saw rain falling throughout 14 August but had no gauges to measure the fall because the precipitation was so unexpected.
  135. ^ Patel, Kasha (19 August 2021). "Rain falls at the summit of Greenland Ice Sheet for first time on record". Washington Post. Archived from the original on 19 August 2021. Retrieved 24 August 2021. Rain fell on and off for 13 hours at the station, but staff are not certain exactly how much rain fell...there are no rain gauges at the summit because no one expected it to rain at this altitude.
  136. ^ "Sea level rise from ice sheets track worst-case climate change scenario". phys.org. Archived from the original on 6 June 2023. Retrieved 8 September 2020.
  137. ^ "Ice sheet melt on track with 'worst-case climate scenario'". www.esa.int. Archived from the original on 9 June 2023. Retrieved 8 September 2020.
  138. ^ Slater, Thomas; Hogg, Anna E.; Mottram, Ruth (31 August 2020). "Ice-sheet losses track high-end sea-level rise projections". Nature Climate Change. 10 (10): 879–881. Bibcode:2020NatCC..10..879S. doi:10.1038/s41558-020-0893-y. ISSN 1758-6798. S2CID 221381924. Archived from the original on 22 January 2021. Retrieved 8 September 2020.
  139. ^ a b c Box, Jason E.; Hubbard, Alun; Bahr, David B.; Colgan, William T.; Fettweis, Xavier; Mankoff, Kenneth D.; Wehrlé, Adrien; Noël, Brice; van den Broeke, Michiel R.; Wouters, Bert; Bjørk, Anders A.; Fausto, Robert S. (29 August 2022). "Greenland ice sheet climate disequilibrium and committed sea-level rise". Nature Climate Change. 12 (9): 808–813. Bibcode:2022NatCC..12..808B. doi:10.1038/s41558-022-01441-2. S2CID 251912711.
  140. ^ a b c Beckmann, Johanna; Winkelmann, Ricarda (27 July 2023). "Effects of extreme melt events on ice flow and sea level rise of the Greenland Ice Sheet". The Cryosphere. 17 (7): 3083–3099. Bibcode:2023TCry...17.3083B. doi:10.5194/tc-17-3083-2023.
  141. ^ "WMO verifies −69.6°C Greenland temperature as Northern hemisphere record". World Meteorological Organization. 22 September 2020. Archived from the original on 18 December 2023.
  142. ^ Wunderling, Nico; Willeit, Matteo; Donges, Jonathan F.; Winkelmann, Ricarda (27 October 2020). "Global warming due to loss of large ice masses and Arctic summer sea ice". Nature Communications. 10 (1): 5177. Bibcode:2020NatCo..11.5177W. doi:10.1038/s41467-020-18934-3. PMC 7591863. PMID 33110092.
  143. ^ Shukman, David (7 August 2010). "Sea level fears as Greenland darkens". BBC News. Archived from the original on 30 July 2023.
  144. ^ Berwyn, Bob (19 April 2018). "What's Eating Away at the Greenland Ice Sheet?". Inside Climate News. Archived from the original on 25 April 2020. Retrieved 13 January 2023.
  145. ^ Cook, Joseph M.; Tedstone, Andrew J.; Williamson, Christopher; McCutcheon, Jenine; Hodson, Andrew J.; Dayal, Archana; Skiles, McKenzie; Hofer, Stefan; Bryant, Robert; McAree, Owen; McGonigle, Andrew; Ryan, Jonathan; Anesio, Alexandre M.; Irvine-Fynn, Tristram D. L.; Hubbard, Alun; Hanna, Edward; Flanner, Mark; Mayanna, Sathish; Benning, Liane G.; van As, Dirk; Yallop, Marian; McQuaid, James B.; Gribbin, Thomas; Tranter, Martyn (29 January 2020). "Glacier algae accelerate melt rates on the south-western Greenland Ice Sheet". The Cryosphere. 14 (1): 309–330. Bibcode:2020TCry...14..309C. doi:10.5194/tc-14-309-2020.
  146. ^ a b Gertner, Jon (12 November 2015). "The Secrets in Greenland's Ice Sheet". The New York Times. Archived from the original on 30 July 2023.
  147. ^ Roe, Gerard H. (2002). "Modelling Precipitation over ice sheets: an assessment using Greenland". Journal of Glaciology. 48 (160): 70–80. Bibcode:2002JGlac..48...70R. doi:10.3189/172756502781831593.
  148. ^ a b Hopwood, M. J.; Carroll, D.; Browning, T. J.; Meire, L.; Mortensen, J.; Krisch, S.; Achterberg, E. P. (14 August 2018). "Non-linear response of summertime marine productivity to increased meltwater discharge around Greenland". Nature Communications. 9 (1): 3256. Bibcode:2018NatCo...9.3256H. doi:10.1038/s41467-018-05488-8. PMC 6092443. PMID 30108210.
  149. ^ Statham, Peter J.; Skidmore, Mark; Tranter, Martyn (1 September 2008). "Inputs of glacially derived dissolved and colloidal iron to the coastal ocean and implications for primary productivity". Global Biogeochemical Cycles. 22 (3): GB3013. Bibcode:2008GBioC..22.3013S. doi:10.1029/2007GB003106. ISSN 1944-9224.
  150. ^ Bhatia, Maya P.; Kujawinski, Elizabeth B.; Das, Sarah B.; Breier, Crystaline F.; Henderson, Paul B.; Charette, Matthew A. (2013). "Greenland meltwater as a significant and potentially bioavailable source of iron to the ocean". Nature Geoscience. 6 (4): 274–278. Bibcode:2013NatGe...6..274B. doi:10.1038/ngeo1746. ISSN 1752-0894.
  151. ^ Arendt, Kristine Engel; Nielsen, Torkel Gissel; Rysgaard, Sren; Tnnesson, Kajsa (22 February 2010). "Differences in plankton community structure along the Godthåbsfjord, from the Greenland Ice Sheet to offshore waters". Marine Ecology Progress Series. 401: 49–62. Bibcode:2010MEPS..401...49E. doi:10.3354/meps08368.
  152. ^ Arrigo, Kevin R.; van Dijken, Gert L.; Castelao, Renato M.; Luo, Hao; Rennermalm, Åsa K.; Tedesco, Marco; Mote, Thomas L.; Oliver, Hilde; Yager, Patricia L. (31 May 2017). "Melting glaciers stimulate large summer phytoplankton blooms in southwest Greenland waters". Geophysical Research Letters. 44 (12): 6278–6285. Bibcode:2017GeoRL..44.6278A. doi:10.1002/2017GL073583.
  153. ^ Simon, Margit H.; Muschitiello, Francesco; Tisserand, Amandine A.; Olsen, Are; Moros, Matthias; Perner, Kerstin; Bårdsnes, Siv Tone; Dokken, Trond M.; Jansen, Eystein (29 September 2020). "A multi-decadal record of oceanographic changes of the past ~165 years (1850-2015 AD) from Northwest of Iceland". PLOS ONE. 15 (9): e0239373. Bibcode:2020PLoSO..1539373S. doi:10.1371/journal.pone.0239373. PMC 7523958. PMID 32991577.
  154. ^ Oksman, Mimmi; Kvorning, Anna Bang; Larsen, Signe Hillerup; Kjeldsen, Kristian Kjellerup; Mankoff, Kenneth David; Colgan, William; Andersen, Thorbjørn Joest; Nørgaard-Pedersen, Niels; Seidenkrantz, Marit-Solveig; Mikkelsen, Naja; Ribeiro, Sofia (24 June 2022). "Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century". The Cryosphere. 16 (6): 2471–2491. Bibcode:2022TCry...16.2471O. doi:10.5194/tc-16-2471-2022.
  155. ^ a b Christiansen, Jesper Riis; Jørgensen, Christian Juncher (9 November 2018). "First observation of direct methane emission to the atmosphere from the subglacial domain of the Greenland Ice Sheet". Scientific Reports. 8 (1): 16623. Bibcode:2018NatSR...816623C. doi:10.1038/s41598-018-35054-7. PMC 6226494. PMID 30413774.
  156. ^ Bhatia, Maya P.; Das, Sarah B.; Longnecker, Krista; Charette, Matthew A.; Kujawinski, Elizabeth B. (1 July 2010). "Molecular characterization of dissolved organic matter associated with the Greenland ice sheet". Geochimica et Cosmochimica Acta. 74 (13): 3768–3784. Bibcode:2010GeCoA..74.3768B. doi:10.1016/j.gca.2010.03.035. hdl:1912/3729. ISSN 0016-7037.
  157. ^ Wadham, J. L.; Hawkings, J. R.; Tarasov, L.; Gregoire, L. J.; Spencer, R. G. M.; Gutjahr, M.; Ridgwell, A.; Kohfeld, K. E. (15 August 2019). "Ice sheets matter for the global carbon cycle". Nature Communications. 10: 3567. Bibcode:2019NatCo..10.3567W. doi:10.1038/s41467-019-11394-4. PMID 31417076.
  158. ^ Tarnocai, C.; Canadell, J.G.; Schuur, E.A.G.; Kuhry, P.; Mazhitova, G.; Zimov, S. (June 2009). "Soil organic carbon pools in the northern circumpolar permafrost region". Global Biogeochemical Cycles. 23 (2): GB2023. Bibcode:2009GBioC..23.2023T. doi:10.1029/2008gb003327.
  159. ^ Ryu, Jong-Sik; Jacobson, Andrew D. (6 August 2012). "CO2 evasion from the Greenland Ice Sheet: A new carbon-climate feedback". Chemical Geology. 320 (13): 80–95. Bibcode:2012ChGeo.320...80R. doi:10.1016/j.chemgeo.2012.05.024.
  160. ^ Dieser, Markus; Broemsen, Erik L J E; Cameron, Karen A; King, Gary M; Achberger, Amanda; Choquette, Kyla; Hagedorn, Birgit; Sletten, Ron; Junge, Karen; Christner, Brent C (17 April 2014). "Molecular and biogeochemical evidence for methane cycling beneath the western margin of the Greenland Ice Sheet". The ISME Journal. 8 (11): 2305–2316. Bibcode:2014ISMEJ...8.2305D. doi:10.1038/ismej.2014.59. PMC 4992074. PMID 24739624.
  161. ^ Znamínko, Matěj; Falteisek, Lukáš; Vrbická, Kristýna; Klímová, Petra; Christiansen, Jesper R.; Jørgensen, Christian J.; Stibal, Marek (16 October 2023). "Methylotrophic Communities Associated with a Greenland Ice Sheet Methane Release Hotspot". Microbial Ecology. 86 (4): 3057–3067. Bibcode:2023MicEc..86.3057Z. doi:10.1007/s00248-023-02302-x. PMC 10640400. PMID 37843656.
  162. ^ Hawkings, Jon R.; Linhoff, Benjamin S.; Wadham, Jemma L.; Stibal, Marek; Lamborg, Carl H.; Carling, Gregory T.; Lamarche-Gagnon, Guillaume; Kohler, Tyler J.; Ward, Rachael; Hendry, Katharine R.; Falteisek, Lukáš; Kellerman, Anne M.; Cameron, Karen A.; Hatton, Jade E.; Tingey, Sarah; Holt, Amy D.; Vinšová, Petra; Hofer, Stefan; Bulínová, Marie; Větrovský, Tomáš; Meire, Lorenz; Spencer, Robert G. M. (24 May 2021). "Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet". Nature Geoscience. 14 (5): 496–502. Bibcode:2021NatGe..14..496H. doi:10.1038/s41561-021-00753-w.
  163. ^ Walther, Kelcie (15 July 2021). "As the Greenland Ice Sheet Retreats, Mercury is Being Released From the Bedrock Below". Columbia Climate School. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
  164. ^ Jørgensen, Christian Juncher; Søndergaard, Jens; Larsen, Martin Mørk; Kjeldsen, Kristian Kjellerup; Rosa, Diogo; Sapper, Sarah Elise; Heimbürger-Boavida, Lars-Eric; Kohler, Stephen G.; Wang, Feiyue; Gao, Zhiyuan; Armstrong, Debbie; Albers, Christian Nyrop (26 January 2024). "Large mercury release from the Greenland Ice Sheet invalidated". Science Advances. 10 (4). doi:10.1126/sciadv.adi7760.
  165. ^ Colgan, William; Machguth, Horst; MacFerrin, Mike; Colgan, Jeff D.; van As, Dirk; MacGregor, Joseph A. (4 August 2016). "The abandoned ice sheet base at Camp Century, Greenland, in a warming climate". Geophysical Research Letters. 43 (15): 8091–8096. Bibcode:2016GeoRL..43.8091C. doi:10.1002/2016GL069688.
  166. ^ Rosen, Julia (4 August 2016). "Mysterious, ice-buried Cold War military base may be unearthed by climate change". Science Magazine. Archived from the original on 15 January 2024. Retrieved 23 December 2023.
  167. ^ Brown, Dwayne; Cabbage, Michael; McCarthy, Leslie; Norton, Karen (20 January 2016). "NASA, NOAA Analyses Reveal Record-Shattering Global Warm Temperatures in 2015". NASA. Archived from the original on 20 January 2016. Retrieved 21 January 2016.
  168. ^ Stefan Rahmstorf; Jason E. Box; Georg Feulner; Michael E. Mann; Alexander Robinson; Scott Rutherford; Erik J. Schaffernicht (May 2015). "Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation" (PDF). Nature. 5 (5): 475–480. Bibcode:2015NatCC...5..475R. doi:10.1038/nclimate2554. Archived (PDF) from the original on 9 September 2016. Retrieved 23 September 2019.
  169. ^ "Melting Greenland ice sheet may affect global ocean circulation, future climate". Phys.org. 22 January 2016. Archived from the original on 19 August 2023. Retrieved 25 January 2016.
  170. ^ Yang, Qian; Dixon, Timothy H.; Myers, Paul G.; Bonin, Jennifer; Chambers, Don; van den Broeke, M. R.; Ribergaard, Mads H.; Mortensen, John (22 January 2016). "Recent increases in Arctic freshwater flux affects Labrador Sea convection and Atlantic overturning circulation". Nature Communications. 7: 10525. Bibcode:2016NatCo...710525Y. doi:10.1038/ncomms10525. PMC 4736158. PMID 26796579.
  171. ^ Greene, Chad A.; Gardner, Alex S.; Wood, Michael; Cuzzone, Joshua K. (18 January 2024). "Ubiquitous acceleration in Greenland Ice Sheet calving from 1985 to 2022". Nature. 625 (7995): 523–528. doi:10.1038/s41586-023-06863-2. ISSN 0028-0836. Archived from the original on 18 January 2024. Retrieved 18 January 2024.
  172. ^ a b Schuur, Edward A.G.; Abbott, Benjamin W.; Commane, Roisin; Ernakovich, Jessica; Euskirchen, Eugenie; Hugelius, Gustaf; Grosse, Guido; Jones, Miriam; Koven, Charlie; Leshyk, Victor; Lawrence, David; Loranty, Michael M.; Mauritz, Marguerite; Olefeldt, David; Natali, Susan; Rodenhizer, Heidi; Salmon, Verity; Schädel, Christina; Strauss, Jens; Treat, Claire; Turetsky, Merritt (2022). "Permafrost and Climate Change: Carbon Cycle Feedbacks From the Warming Arctic". Annual Review of Environment and Resources. 47: 343–371. doi:10.1146/annurev-environ-012220-011847. Medium-range estimates of Arctic carbon emissions could result from moderate climate emission mitigation policies that keep global warming below 3°C (e.g., RCP4.5). This global warming level most closely matches country emissions reduction pledges made for the Paris Climate Agreement...
  173. ^ a b Phiddian, Ellen (5 April 2022). "Explainer: IPCC Scenarios". Cosmos. Archived from the original on 20 September 2023. Retrieved 30 September 2023. "The IPCC doesn't make projections about which of these scenarios is more likely, but other researchers and modellers can. The Australian Academy of Science, for instance, released a report last year stating that our current emissions trajectory had us headed for a 3°C warmer world, roughly in line with the middle scenario. Climate Action Tracker predicts 2.5 to 2.9°C of warming based on current policies and action, with pledges and government agreements taking this to 2.1°C.
  174. ^ Bakker, P; Schmittner, A; Lenaerts, JT; Abe-Ouchi, A; Bi, D; van den Broeke, MR; Chan, WL; Hu, A; Beadling, RL; Marsland, SJ; Mernild, SH; Saenko, OA; Swingedouw, D; Sullivan, A; Yin, J (11 November 2016). "Fate of the Atlantic Meridional Overturning Circulation: Strong decline under continued warming and Greenland melting". Geophysical Research Letters. 43 (23): 12, 252–12, 260. Bibcode:2016GeoRL..4312252B. doi:10.1002/2016GL070457. hdl:10150/622754. S2CID 133069692.
  175. ^ Hausfather, Zeke; Peters, Glen (29 January 2020). "Emissions – the 'business as usual' story is misleading". Nature. 577 (7792): 618–20. Bibcode:2020Natur.577..618H. doi:10.1038/d41586-020-00177-3. PMID 31996825.
  176. ^ a b "Anticipating Future Sea Levels". EarthObservatory.NASA.gov. National Aeronautics and Space Administration (NASA). 2021. Archived from the original on 7 July 2021.
  177. ^ Hansen, James; Sato, Makiko; Kharecha, Pushker; Russell, Gary; Lea, David W.; Siddall, Mark (18 May 2007). "Climate change and trace gases". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 365 (1856): 1925–1954. Bibcode:2007RSPTA.365.1925H. doi:10.1098/rsta.2007.2052. PMID 17513270. S2CID 8785953.
  178. ^ Hansen, James; Sato, Makiko; Hearty, Paul; Ruedy, Reto; Kelley, Maxwell; Masson-Delmotte, Valerie; Russell, Gary; Tselioudis, George; Cao, Junji; Rignot, Eric; Velicogna, Isabella; Tormey, Blair; Donovan, Bailey; Kandiano, Evgeniya; von Schuckmann, Karina; Kharecha, Pushker; Legrande, Allegra N.; Bauer, Michael; Lo, Kwok-Wai (22 March 2016). "Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 °C global warming could be dangerous". Atmospheric Chemistry and Physics. 16 (6): 3761–3812. arXiv:1602.01393. Bibcode:2016ACP....16.3761H. doi:10.5194/acp-16-3761-2016. S2CID 9410444. Ice melt cooling is advanced as global ice melt reaches 1 m of sea level in 2060, 1/3 from Greenland and 2/3 from Antarctica
  179. ^ Mooney, Chris (23 July 2015). "James Hansen's controversial sea level rise paper has now been published online". The Washington Post. Archived from the original on 26 November 2019. Retrieved 11 December 2023.
  180. ^ Khan, Shfaqat A.; Choi, Youngmin; Morlighem, Mathieu; Rignot, Eric; Helm, Veit; Humbert, Angelika; Mouginot, Jérémie; Millan, Romain; Kjær, Kurt H.; Bjørk, Anders A. (9 November 2022). "Extensive inland thinning and speed-up of Northeast Greenland Ice Stream". Nature. 611 (7937): 727–732. Bibcode:2022NatCC..12..808B. doi:10.1038/s41558-022-01441-2. PMC 9684075. PMID 36352226.
  181. ^ Nick, Faezeh M.; Vieli, Andreas; Langer Andersen, Morten; Joughin, Ian; Payne, Antony; Edwards, Tamsin L.; Pattyn, Frank; van de Wal, Roderik S. W. (8 May 2013). "Future sea-level rise from Greenland's main outlet glaciers in a warming climate" (PDF). Nature. 497 (1): 235–238. Bibcode:2013Natur.497..235N. doi:10.1038/nature12068. PMID 23657350. S2CID 4400824. Archived (PDF) from the original on 22 September 2023. Retrieved 13 December 2023.
  182. ^ Meyssignac, B.; Fettweis, X.; Chevrier, R.; Spada, G. (15 March 2017). "Regional Sea Level Changes for the Twentieth and the Twenty-First Centuries Induced by the Regional Variability in Greenland Ice Sheet Surface Mass Loss". Journal of Climate. 30 (6): 2011–2028. Bibcode:2017JCli...30.2011M. doi:10.1175/JCLI-D-16-0337.1.
  183. ^ Turrin, Margie (5 February 2020). "Greenland Rising: The Future of Greenland's Waterfront". Columbia Climate School. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
  184. ^ Borreggine, Marisa; Latychev, Konstantin; Coulson, Sophie; Alley, Richard B. (17 April 2023). "Sea-level rise in Southwest Greenland as a contributor to Viking abandonment". Proceedings of the National Academy of Sciences. 120 (17): e2209615120. Bibcode:2023PNAS..12009615B. doi:10.1073/pnas.2209615120. PMID 37068242.
  185. ^ "Vikings Abandoned Greenland Centuries Ago in Face of Rising Seas, Says New Study". Columbia Climate School. 1 May 2023. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
  186. ^ a b King, Michalea D.; Howat, Ian M.; Candela, Salvatore G.; Noh, Myoung J.; Jeong, Seongsu; Noël, Brice P. Y.; van den Broeke, Michiel R.; Wouters, Bert; Negrete, Adelaide (13 August 2020). "Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat". Communications Earth & Environment. 1 (1): 1–7. Bibcode:2020ComEE...1....1K. doi:10.1038/s43247-020-0001-2. ISSN 2662-4435. Text and images are available under a Creative Commons Attribution 4.0 International License.
  187. ^ "Arctic warming three times faster than the planet, report warns". Phys.org. 20 May 2021. Archived from the original on 26 July 2023. Retrieved 6 October 2022.
  188. ^ Rantanen, Mika; Karpechko, Alexey Yu; Lipponen, Antti; Nordling, Kalle; Hyvärinen, Otto; Ruosteenoja, Kimmo; Vihma, Timo; Laaksonen, Ari (11 August 2022). "The Arctic has warmed nearly four times faster than the globe since 1979". Communications Earth & Environment. 3 (1): 168. Bibcode:2022ComEE...3..168R. doi:10.1038/s43247-022-00498-3. ISSN 2662-4435. S2CID 251498876.
  189. ^ "The Arctic is warming four times faster than the rest of the world". 14 December 2021. Archived from the original on 8 November 2023. Retrieved 6 October 2022.
  190. ^ NEEM community members; Dahl-Jensen, D.; Albert, M. R.; Aldahan, A.; Azuma, N.; Balslev-Clausen, D.; Baumgartner, M.; Berggren, A. -M.; Bigler, M.; Binder, T.; Blunier, T.; Bourgeois, J. C.; Brook, E. J.; Buchardt, S. L.; Buizert, C.; Capron, E.; Chappellaz, J.; Chung, J.; Clausen, H. B.; Cvijanovic, I.; Davies, S. M.; Ditlevsen, P.; Eicher, O.; Fischer, H.; Fisher, D. A.; Fleet, L. G.; Gfeller, G.; Gkinis, V.; Gogineni, S.; et al. (24 January 2013). "Eemian interglacial reconstructed from a Greenland folded ice core" (PDF). Nature. 493 (7433): 489–494. Bibcode:2013Natur.493..489N. doi:10.1038/nature11789. PMID 23344358. S2CID 4420908. Archived (PDF) from the original on 29 September 2019. Retrieved 25 September 2019.
  191. ^ Landais, Amaelle; Masson-Delmotte, Valérie; Capron, Emilie; Langebroek, Petra M.; Bakker, Pepijn; Stone, Emma J.; Merz, Niklaus; Raible, Christoph C.; Fischer, Hubertus; Orsi, Anaïs; Prié, Frédéric; Vinther, Bo; Dahl-Jensen, Dorthe (29 September 2016). "How warm was Greenland during the last interglacial period?". Climate of the Past. 12 (3): 369–381. Bibcode:2016CliPa..12.1933L. doi:10.5194/cp-12-1933-2016.
  192. ^ "Warming Greenland ice sheet passes point of no return". Ohio State University. 13 August 2020. Archived from the original on 5 September 2023. Retrieved 15 August 2020.
  193. ^ Noël, B.; van de Berg, W. J; Lhermitte, S.; Wouters, B.; Machguth, H.; Howat, I.; Citterio, M.; Moholdt, G.; Lenaerts, J. T. M.; van den Broeke, M. R. (31 March 2017). "A tipping point in refreezing accelerates mass loss of Greenland's glaciers and ice caps". Nature Communications. 8 (1): 14730. Bibcode:2017NatCo...814730N. doi:10.1038/ncomms14730. PMC 5380968. PMID 28361871.
  194. ^ Gregory, J. M; Huybrechts, P (25 May 2006). "Ice-sheet contributions to future sea-level change" (PDF). Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 364 (1844): 1709–1732. Bibcode:2006RSPTA.364.1709G. doi:10.1098/rsta.2006.1796. PMID 16782607. S2CID 447843. Archived (PDF) from the original on 10 December 2023. Retrieved 13 December 2023.
  195. ^ Robinson, Alexander; Calov, Reinhard; Ganopolski, Andrey (11 March 2012). "Multistability and critical thresholds of the Greenland ice sheet". Nature Climate Change. 2 (6): 429–432. Bibcode:2012NatCC...2..429R. doi:10.1038/nclimate1449.
  196. ^ Nordhaus, William (4 June 2019). "Economics of the disintegration of the Greenland ice sheet". Proceedings of the National Academy of Sciences. 116 (25): 12261–12269. Bibcode:2019PNAS..11612261N. doi:10.1073/pnas.1814990116. PMC 7056935. PMID 31164425.
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