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East Antarctic ice sheet
TypeIce sheet
Thickness~2.2 km (1.4 mi) (average),[1] ~4.9 km (3.0 mi) (maximum) [2]

The East Antarctic Ice Sheet (EAIS) lies between 45° west and 168° east longitudinally. It was first formed around 34 million years ago,[3] and it is the largest ice sheet on the entire planet, with far greater volume than the Greenland ice sheet or the West Antarctic Ice Sheet (WAIS), from which it is separated by the Transantarctic Mountains. The ice sheet is around 2.2 km (1.4 mi) thick on average and is 4,897 m (16,066 ft) at its thickest point.[2] It is also home to the geographic South Pole, South Magnetic Pole and the Amundsen–Scott South Pole Station.

The surface of the EAIS is the driest, windiest, and coldest place on Earth. Lack of moisture in the air, high albedo from the snow as well as the surface's consistently high elevation[4] results in the reported cold temperature records of nearly −100 °C (−148 °F).[5][6] It is the only place on Earth cold enough for atmospheric temperature inversion to occur consistently. That is, while the atmosphere is typically warmest near the surface and becomes cooler at greater elevation, atmosphere during the Antarctic winter is cooler at the surface than in its middle layers. Consequently, greenhouse gases actually trap heat in the middle atmosphere and reduce its flow towards the surface while the temperature inversion lasts.[4]

Due to these factors, East Antarctica had experienced slight cooling for decades while the rest of the world warmed as the result of climate change. Clear warming over East Antarctica only started to occur since the year 2000, and was not conclusively detected until the 2020s.[7][8] In the early 2000s, cooling over East Antarctica seemingly outweighing warming over the rest of the continent was frequently misinterpreted by the media and occasionally used as an argument for climate change denial.[9][10][11] After 2009, improvements in Antarctica's instrumental temperature record have proven that the warming over West Antarctica resulted in consistent net warming across the continent since the 1957.[12]

Because the East Antarctic ice sheet has barely warmed, it is still gaining ice on average.[13][14] for instance, GRACE satellite data indicated East Antarctica mass gain of 60 ± 13 billion tons per year between 2002 and 2010.[15] It is most likely to first see sustained losses of ice at its most vulnerable locations such as Totten Glacier and Wilkes Basin. Those areas are sometimes collectively described as East Antarctica's subglacial basins, and it is believed that once the warming reaches around 3 °C (5.4 °F), then they would start to collapse over a period of around 2,000 years,[16][17] This collapse would ultimately add between 1.4 m (4 ft 7 in) and 6.4 m (21 ft 0 in) to sea levels, depending on the ice sheet model used.[18] The EAIS as a whole holds enough ice to raise global sea levels by 53.3 m (175 ft).[2] However, it would take global warming in a range between 5 °C (9.0 °F) and 10 °C (18 °F), and a minimum of 10,000 years for the entire ice sheet to be lost.[16][17]

Description

Location and diagram of Lake Vostok, a prominent subglacial lake beneath the East Antarctic Ice Sheet.

East Antarctic Ice Sheet is located directly above the East Antarctic Shield – a craton (stable area of the Earth's crust) with the area of 10,200,000 km2 (3,900,000 sq mi), which accounts for around 73% of the entire Antarctic landmass.[19] East Antarctica is separate from West Antarctica due to the presence of Transantarctic Mountains, which span nearly 3,500 km (2,200 mi) from the Weddell Sea to the Ross Sea, and have a width of 100–300 km (62–186 mi).[1]

The ice sheet has an average thickness of around 2.2 km (1.4 mi). The thickest ice in Antarctica is located near Adélie Land close to the ice sheet's southeast coast, at the Astrolabe Subglacial Basin, where it measured 4,897 m (16,066 ft) around 2013.[1] Much of the ice sheet is already located at a high elevation: in particular, Dome Argus Plateau has an average height of around 4 km (2.5 mi), and yet it is underlain by the Gamburtsev Mountain Range, which has the average height of 2.7 km (1.7 mi) and is about equivalent in size to the European Alps.[20][21] Consequently, the ice thickness over these mountains ranges from around 1 km (0.62 mi) over their peaks to about 3 km (1.9 mi) over the valleys.[22]

South Pole research station.

These high elevations are an important reason for why the ice sheet is the driest, windiest, and coldest place on Earth. Dome A in particular sets reported cold temperature records of nearly −100 °C (−148 °F).[5][6][4] The only ice-free areas of East Antarctica are where there is too little annual precipitation to form an ice layer, which is the case in the so-called McMurdo Dry Valleys of the Southern Victoria Land. Another exception are the subglacial lakes, which occur so deep beneath the ice that the pressure melting point is well below 0 °C (32 °F).[22]

Many countries have made territorial claims in Antarctica. Within EAIS, the United Kingdom, France, Norway, Australia, Chile and Argentina all claim a portion (sometimes overlapping) as their own territory.[23]

Geologic history

Polar climatic temperature changes throughout the Cenozoic, showing glaciation of Antarctica toward the end of the Eocene, thawing near the end of the Oligocene and subsequent Miocene re-glaciation.

While relatively small glaciers and ice caps are known to have been present in Antarctica since at least the time of Late Palaeocene, 60 million years ago,[24] a proper ice sheet did not begin to form until the Eocene–Oligocene extinction event about 34 million years ago, when the atmospheric CO2 levels fell to below 750 parts per million. It was initially unstable, and did not grow to consistently cover the entire continent until 32.8 million years ago, when the CO2 levels had further declined to below 600 ppm.[3]

Afterwards, the East Antarctic Ice Sheet declined substantially during the Middle Miocene Climatic Optimum 15 million years ago, yet started to recover about 13.96 million years ago.[24] Since then, it had been largely stable, experiencing "minimal" change in its surface extent over the past 8 million years.[25] While it had still thinned by at least 500 m (1,600 ft) during the Pleistocene period, and by less than 50 m (160 ft) since Last Glacial Maximum, the land area covered by ice in East Antarctica remained largely the same.[26] Contrastingly, the smaller West Antarctic ice sheet is thought to have largely collapsed as recently as during the Eemian period, about 125,000 years ago.[27][28][29][30][31]

Recent climate change

Parts of East Antarctica (marked in blue) are currently the only place on Earth to regularly experience negative greenhouse effect. At greater warming levels, this effect is likely to disappear due to increasing concentrations of water vapor over Antarctica[32]

Antarctica as a whole has low sensitivity to climate change because it is surrounded by the Southern Ocean, which is more effective at absorbing heat than any other ocean due to the currents of the Southern Ocean overturning circulation,[33][34] very low amounts of water vapor (which conducts heat through the atmosphere)[32] and because of the high albedo (reflectivity) of its icy surface and of the surrounding sea ice.[4] These factors make Antarctica the coldest continent, and East Antarctica is additionally cooler than the West Antarctica, because it is located at a substantially greater elevation.[4] Thus, it is the only place on Earth cold enough for atmospheric temperature inversion to occur every winter.[32] While the atmosphere on Earth is at its warmest near the surface and becomes cooler as elevation increases, temperature inversion during the Antarctic winter results in middle layers of the atmosphere being warmer than the surface.[32]

This leads to the negative greenhouse effect on a local scale, where greenhouse gases trap heat in the middle atmosphere and reduce its flow towards the surface and towards space, while normally, they prevent the flow of heat from the lower atmosphere and towards space.[32] This effect lasts until the end of the Antarctic winter.[4] Consequently, East Antarctica had experienced cooling in the 1980s and 1990s, even as the rest of the Earth was warming. For instance, between 1986 and 2006 there had been a cooling of 0.7 °C (1.3 °F) per decade at Lake Hoare station in the McMurdo Dry Valleys.[35] A 2002 paper by Peter Doran suggested that the cooling over East Antarctica outweighed warming of the rest of the continent.[36] While the paper estimated that about 42% of the Antarctic area had been warming, it was wrongly described by many media outlets as a proof that there was no warming in Antarctica.[9] In 2004, author Michael Crichton used that cooling as one of his arguments for denying climate change in his novel State of Fear.[37] First other scientists, and then Peter Doran himself eventually had to debunk the book's claims.[10][11]

East Antarctica had demonstrated cooling in the 1980s and 1990s, even as the West Antarctica warmed (left-hand side). Changes in atmospheric patterns had reversed the trend in 2000s and 2010s (right-hand side) [7]

In 2009, it was demonstrated that the West Antarctic Ice Sheet has warmed by more than 0.1 °C/decade since the 1950s, resulting in a statistically significant warming trend across Antarctica of >0.05 °C/decade since 1957.[12] Later research found that after 2000, the warming of West Antarctica locations slowed or partially reversed between 2000 and 2020, while the East Antarctica interior had demonstrated clear warming. This happened due to the local changes in Southern Annular Mode the dominant climate variability pattern over the Antarctica. Some of those changes were caused by the ozone layer beginning to recover following the Montreal Protocol.[7][8]

Aerial view of ice flows at Denman Glacier, one of the relatively few glaciers in the East Antarctica known to be losing mass.[38]

The limited warming and already low temperatures over East Antarctica mean that as of early 2020s, the majority of observational evidence shows it continuing to gain mass.[15][39][13][14] Some analyses have suggested it already began to lose mass in 2000s,[40][41] but they over-extrapolated some observed losses onto the poorly-observed areas, and a more complete observational record shows continued mass gain.[13] Because it is currently gaining mass, East Antarctic Ice Sheet is not expected to play a role in the 21st century sea level rise. However, it is still subject to adverse change, such as the retreat of Denman Glacier,[38][42] or the flow of warmer ocean current into ice cavities beneath the stabilizing ice shelves like the Fimbulisen ice shelf in the Queen Maud Land.[43]

Long-term future

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).[44] If the emissions accelerate rapidly (top trace), sea levels could rise 5 m (16+1⁄2 ft) by 2300. This would involve ice loss from the EAIS.[44]

If global warming were to reach higher levels, then the EAIS would play an increasingly larger role in sea level rise occurring after 2100. According to the most recent reports of the Intergovernmental Panel on Climate Change (SROCC and the IPCC Sixth Assessment Report), the most intense climate change scenario, where the anthropogenic emissions increase continuously, RCP8.5, would result in Antarctica alone losing a median of 1.46 m (4 ft 9 in) (confidence interval between 60 cm (2.0 ft) and 2.89 m (9 ft 6 in)) by 2300, which would involve some loss from the EAIS in addition to the erosion of the WAIS. This Antarctica-only sea level rise would be in addition to ice losses from the Greenland ice sheet and mountain glaciers, as well as the thermal expansion of ocean water.[45] If the warming were to remain at elevated levels for a long time, then the East Antarctic Ice Sheet would eventually become the dominant contributor to sea level rise, simply because it contains the largest amount of ice.[45][16]

Sustained ice loss from the EAIS would begin with the significant erosion of the so-called subglacial basins, such as Totten Glacier and Wilkes Basin, which are located in vulnerable locations below the sea level. Evidence from the Pleistocene shows that Wilkes Basin had likely lost enough ice to add 0.5 m (1 ft 8 in) to sea levels between 115,000 and 129,000 years ago, during the Eemian, and about 0.9 m (2 ft 11 in) between 318,000 and 339,000 years ago, during the Marine Isotope Stage 9.[46] Neither Wilkes nor the other subglacial basins were lost entirely, but estimates suggest that they would be committed to disappearance once the global warming reaches 3 °C (5.4 °F) - the plausible temperature range is between 2 °C (3.6 °F) and 6 °C (11 °F).[16][17] Then, the subglacial basins would gradually collapse over a period of around 2,000 years, although it may be as fast as 500 years or as slow as 10,000 years.[16][17] Their loss would ultimately add between 1.4 m (4 ft 7 in) and 6.4 m (21 ft 0 in) to sea levels, depending on the ice sheet model used. Isostatic rebound of the newly ice-free land would also add 8 cm (3.1 in) and 57 cm (1 ft 10 in), respectively.[18]

Retreat of Cook Glacier – a key part of the Wilkes Basin – during the Eemian ~120,000 years ago and an earlier Pleistocene interglacial ~330,000 years ago. These retreats would have added about 0.5 m (1 ft 8 in) and 0.9 m (2 ft 11 in) to sea level rise.[46]

The entire East Antarctic Ice Sheet holds enough ice to raise global sea levels by 53.3 m (175 ft).[2] Its complete melting is also possible, but it would require very high warming and a lot of time: In 2022, an extensive assessment of tipping points in the climate system published in Science Magazine concluded that the ice sheet would take a minimum of 10,000 years to fully melt. It would most likely be committed to complete disappearance only once the global warming reaches about 7.5 °C (13.5 °F), with the minimum and the maximum range between 5 °C (9.0 °F) and 10 °C (18 °F).[16][17] Another estimate suggested that at least 6 °C (11 °F) would be needed to melt two thirds of its volume.[47]

If the entire ice sheet were to disappear, then the change in ice-albedo feedback would increase the global temperature by 0.6 °C (1.1 °F), while the regional temperatures would increase by around 2 °C (3.6 °F). The loss of the subglacial basins alone would only add about 0.05 °C (0.090 °F) to global temperatures due to their relatively limited area, and a correspondingly low impact on global albedo.[16][17]

See also

References

  1. ^ a b c Torsvik, T. H.; Gaina, C.; Redfield, T. F. (2008). "Antarctica and Global Paleogeography: From Rodinia, Through Gondwanaland and Pangea, to the Birth of the Southern Ocean and the Opening of Gateways". Antarctica: A Keystone in a Changing World. pp. 125–140. doi:10.17226/12168. ISBN 978-0-309-11854-5.
  2. ^ a b c d Fretwell, P.; Pritchard, H. D.; Vaughan, D. G.; Bamber, J. L.; Barrand, N. E.; Bell, R.; Bianchi, C.; Bingham, R. G.; Blankenship, D. D. (2013-02-28). "Bedmap2: improved ice bed, surface and thickness datasets for Antarctica". The Cryosphere. 7 (1): 375–393. Bibcode:2013TCry....7..375F. doi:10.5194/tc-7-375-2013. hdl:1808/18763. ISSN 1994-0424.
  3. ^ a b Galeotti, Simone; DeConto, Robert; Naish, Timothy; Stocchi, Paolo; Florindo, Fabio; Pagani, Mark; Barrett, Peter; Bohaty, Steven M.; Lanci, Luca; Pollard, David; Sandroni, Sonia; Talarico, Franco M.; Zachos, James C. (10 March 2016). "Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition". Science. 352 (6281): 76–80. doi:10.1126/science.aab066.
  4. ^ a b c d e f Singh, Hansi A.; Polvani, Lorenzo M. (10 January 2020). "Low Antarctic continental climate sensitivity due to high ice sheet orography". npj Climate and Atmospheric Science. 3. doi:10.1038/s41612-020-00143-w. S2CID 222179485.
  5. ^ a b Scambos, T. A.; Campbell, G. G.; Pope, A.; Haran, T.; Muto, A.; Lazzara, M.; Reijmer, C. H.; Van Den Broeke, M. R. (25 June 2018). "Ultralow Surface Temperatures in East Antarctica From Satellite Thermal Infrared Mapping: The Coldest Places on Earth". Geophysical Research Letters. 45 (12): 6124–6133. Bibcode:2018GeoRL..45.6124S. doi:10.1029/2018GL078133. hdl:1874/367883.
  6. ^ a b Vizcarra, Natasha (25 June 2018). "New study explains Antarctica's coldest temperatures". National Snow and Ice Data Center. Retrieved 10 January 2024.
  7. ^ a b c Xin, Meijiao; Clem, Kyle R; Turner, John; Stammerjohn, Sharon E; Zhu, Jiang; Cai, Wenju; Li, Xichen (2 June 2023). "West-warming East-cooling trend over Antarctica reversed since early 21st century driven by large-scale circulation variation". Environmental Research Letters. 18 (6): 064034. doi:10.1088/1748-9326/acd8d4.
  8. ^ a b Xin, Meijiao; Li, Xichen; Stammerjohn, Sharon E; Cai, Wenju; Zhu, Jiang; Turner, John; Clem, Kyle R; Song, Chentao; Wang, Wenzhu; Hou, Yurong (17 May 2023). "A broadscale shift in antarctic temperature trends". Climate Dynamics. 61: 4623–4641. doi:10.1007/s00382-023-06825-4.
  9. ^ a b Davidson, Keay (2002-02-04). "Media goofed on Antarctic data / Global warming interpretation irks scientists". San Francisco Chronicle. Retrieved 2013-04-13.
  10. ^ a b Eric Steig; Gavin Schmidt (2004-12-03). "Antarctic cooling, global warming?". Real Climate. Retrieved 2008-08-14. At first glance this seems to contradict the idea of "global" warming, but one needs to be careful before jumping to this conclusion. A rise in the global mean temperature does not imply universal warming. Dynamical effects (changes in the winds and ocean circulation) can have just as large an impact, locally as the radiative forcing from greenhouse gases. The temperature change in any particular region will in fact be a combination of radiation-related changes (through greenhouse gases, aerosols, ozone and the like) and dynamical effects. Since the winds tend to only move heat from one place to another, their impact will tend to cancel out in the global mean.
  11. ^ a b Peter Doran (2006-07-27). "Cold, Hard Facts". The New York Times. Archived from the original on April 11, 2009. Retrieved 2008-08-14.
  12. ^ a b Steig, E. J.; Schneider, D. P.; Rutherford, S. D.; Mann, M. E.; Comiso, J. C.; Shindell, D. T. (2009). "Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year". Nature. 457 (7228): 459–462. Bibcode:2009Natur.457..459S. doi:10.1038/nature07669. PMID 19158794. S2CID 4410477.
  13. ^ a b c Zwally, H. Jay; Robbins, John W.; Luthcke, Scott B.; Loomis, Bryant D.; Rémy, Frédérique (29 March 2021). "Mass balance of the Antarctic ice sheet 1992–2016: reconciling results from GRACE gravimetry with ICESat, ERS1/2 and Envisat altimetry". Journal of Glaciology. 67 (263): 533–559. doi:10.1017/jog.2021.8. Although their methods of interpolation or extrapolation for areas with unobserved output velocities have an insufficient description for the evaluation of associated errors, such errors in previous results (Rignot and others, 2008) caused large overestimates of the mass losses as detailed in Zwally and Giovinetto (Zwally and Giovinetto, 2011).
  14. ^ a b NASA (7 July 2023). "Antarctic Ice Mass Loss 2002–2023".
  15. ^ a b King, M. A.; Bingham, R. J.; Moore, P.; Whitehouse, P. L.; Bentley, M. J.; Milne, G. A. (2012). "Lower satellite-gravimetry estimates of Antarctic sea-level contribution". Nature. 491 (7425): 586–589. Bibcode:2012Natur.491..586K. doi:10.1038/nature11621. PMID 23086145. S2CID 4414976.
  16. ^ a b c d e f g 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). doi:10.1126/science.abn7950. hdl:10871/131584. ISSN 0036-8075. S2CID 252161375.
  17. ^ a b c d e f Armstrong McKay, David (9 September 2022). "Exceeding 1.5°C global warming could trigger multiple climate tipping points – paper explainer". climatetippingpoints.info. Retrieved 2 October 2022.
  18. ^ a b Pan, Linda; Powell, Evelyn M.; Latychev, Konstantin; Mitrovica, Jerry X.; Creveling, Jessica R.; Gomez, Natalya; Hoggard, Mark J.; Clark, Peter U. (30 April 2021). "Rapid postglacial rebound amplifies global sea level rise following West Antarctic Ice Sheet collapse". Science Advances. 7 (18). doi:10.1126/sciadv.abf7787.
  19. ^ Drewry, David J. (November 1976). "Sedimentary basins of the east antarctic craton from geophysical evidence". Tectonophysics. 36 (1–3): 301–314. Bibcode:1976Tectp..36..301J. doi:10.1016/0040-1951(76)90023-8.
  20. ^ Sara E. Pratt (6 February 2012). "Unearthing Antarctica's mysterious mountains". Earth Magazine. Retrieved 15 January 2024.
  21. ^ Robin Bell (12 November 2008). "Dispatches from the Bottom of the Earth: An Antarctic Expedition in Search of Large Mountains Encased in Ice". Scientific American. Retrieved 15 January 2024.
  22. ^ a b Davies, Bethan (22 June 2020). "East Antarctic Ice Sheet". AntarcticGlaciers.org.
  23. ^ Bush, W. M. (October 1989). "Antarctica and international law: a collection of inter-state and national documents". American Journal of International Law. 83 (4): 959–964. doi:10.2307/2203393. ISBN 978-0-379-20321-9.
  24. ^ a b Barr, Iestyn D.; Spagnolo, Matteo; Rea, Brice R.; Bingham, Robert G.; Oien, Rachel P.; Adamson, Kathryn; Ely, Jeremy C.; Mullan, Donal J.; Pellitero, Ramón; Tomkins, Matt D. (21 September 2022). "60 million years of glaciation in the Transantarctic Mountains". Nature Communications. 13 (1): 5526. doi:10.1038/s41467-022-33310-z. hdl:2164/19437. ISSN 2041-1723.
  25. ^ Shakun, Jeremy D.; et al. (2018). "Minimal East Antarctic Ice Sheet retreat onto land during the past eight million years". Nature. 558 (7709): 284–287. Bibcode:2018Natur.558..284S. doi:10.1038/s41586-018-0155-6. OSTI 1905199. PMID 29899483. S2CID 49185845.
  26. ^ Yusuke Suganuma; Hideki Miura; Albert Zondervan; Jun'ichi Okuno (August 2014). "East Antarctic deglaciation and the link to global cooling during the Quaternary: evidence from glacial geomorphology and 10Be surface exposure dating of the Sør Rondane Mountains, Dronning Maud Land". Quaternary Science Reviews. 97: 102–120. Bibcode:2014QSRv...97..102S. doi:10.1016/j.quascirev.2014.05.007.
  27. ^ Voosen, Paul (2018-12-18). "Discovery of recent Antarctic ice sheet collapse raises fears of a new global flood". Science. Retrieved 2018-12-28.
  28. ^ Turney, Chris S. M.; Fogwill, Christopher J.; Golledge, Nicholas R.; McKay, Nicholas P.; Sebille, Erik van; Jones, Richard T.; Etheridge, David; Rubino, Mauro; Thornton, David P.; Davies, Siwan M.; Ramsey, Christopher Bronk (2020-02-11). "Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica". Proceedings of the National Academy of Sciences. 117 (8): 3996–4006. Bibcode:2020PNAS..117.3996T. doi:10.1073/pnas.1902469117. ISSN 0027-8424. PMC 7049167. PMID 32047039.
  29. ^ Carlson, Anders E; Walczak, Maureen H; Beard, Brian L; Laffin, Matthew K; Stoner, Joseph S; Hatfield, Robert G (10 December 2018). Absence of the West Antarctic ice sheet during the last interglaciation. American Geophysical Union Fall Meeting.
  30. ^ Lau, Sally C. Y.; Wilson, Nerida G.; Golledge, Nicholas R.; Naish, Tim R.; Watts, Phillip C.; Silva, Catarina N. S.; Cooke, Ira R.; Allcock, A. Louise; Mark, Felix C.; Linse, Katrin (21 December 2023). "Genomic evidence for West Antarctic Ice Sheet collapse during the Last Interglacial". Science. 382 (6677): 1384–1389. doi:10.1126/science.ade0664.
  31. ^ AHMED, Issam. "Antarctic octopus DNA reveals ice sheet collapse closer than thought". phys.org. Retrieved 2023-12-23.
  32. ^ a b c d e Sejas, Sergio A.; Taylor, Patrick C.; Cai, Ming (11 July 2018). "Unmasking the negative greenhouse effect over the Antarctic Plateau". npj Climate and Atmospheric Science. 1. doi:10.1038/s41612-018-0031-y. PMC 7580794.
  33. ^ Bourgeois, Timothée; Goris, Nadine; Schwinger, Jörg; Tjiputra, Jerry F. (17 January 2022). "Stratification constrains future heat and carbon uptake in the Southern Ocean between 30°S and 55°S". Nature Communications. 13 (1): 340. Bibcode:2022NatCo..13..340B. doi:10.1038/s41467-022-27979-5. PMC 8764023. PMID 35039511.
  34. ^ Lenton, T. M.; Armstrong McKay, D.I.; Loriani, S.; Abrams, J.F.; Lade, S.J.; Donges, J.F.; Milkoreit, M.; Powell, T.; Smith, S.R.; Zimm, C.; Buxton, J.E.; Daube, Bruce C.; Krummel, Paul B.; Loh, Zoë; Luijkx, Ingrid T. (2023). The Global Tipping Points Report 2023 (Report). University of Exeter.
  35. ^ Obryk, M. K.; Doran, P. T.; Fountain, A. G.; Myers, M.; McKay, C. P. (16 July 2020). "Climate From the McMurdo Dry Valleys, Antarctica, 1986–2017: Surface Air Temperature Trends and Redefined Summer Season". Journal of Geophysical Research: Atmospheres. 125 (13). Bibcode:2020JGRD..12532180O. doi:10.1029/2019JD032180. ISSN 2169-897X. S2CID 219738421.
  36. ^ Doran, Peter T.; Priscu, JC; Lyons, WB; et al. (January 2002). "Antarctic climate cooling and terrestrial ecosystem response" (PDF). Nature. 415 (6871): 517–20. doi:10.1038/nature710. PMID 11793010. S2CID 387284. Archived from the original (PDF) on 11 December 2004.
  37. ^ Crichton, Michael (2004). State of Fear. HarperCollins, New York. p. 109. ISBN 978-0-06-621413-9. The data show that one relatively small area called the Antarctic Peninsula is melting and calving huge icebergs. That's what gets reported year after year. But the continent as a whole is getting colder, and the ice is getting thicker. First Edition
  38. ^ a b Brancato, V.; Rignot, E.; Milillo, P.; Morlighem, M.; Mouginot, J.; An, L.; Scheuchl, B.; Jeong, S.; Rizzoli, P.; Bueso Bello, J.L.; Prats-Iraola, P. (2020). "Grounding line retreat of Denman Glacier, East Antarctica, measured with COSMO-SkyMed radar interferometry data". Geophysical Research Letters. 47 (7): e2019GL086291. Bibcode:2020GeoRL..4786291B. doi:10.1029/2019GL086291. ISSN 0094-8276.
  39. ^ IMBIE team (13 June 2018). "Mass balance of the Antarctic Ice Sheet from 1992 to 2017". Nature. 558 (7709): 219–222. Bibcode:2018Natur.558..219I. doi:10.1038/s41586-018-0179-y. hdl:2268/225208. PMID 29899482. S2CID 49188002.
  40. ^ Chen, J. L.; Wilson, C. R.; Blankenship, D.; Tapley, B. D. (2009). "Accelerated Antarctic ice loss from satellite gravity measurements". Nature Geoscience. 2 (12): 859. Bibcode:2009NatGe...2..859C. doi:10.1038/ngeo694. S2CID 130927366.
  41. ^ Rignot, Eric; Mouginot, Jérémie; Scheuchl, Bernd; van den Broeke, Michiel; van Wessem, Melchior J.; Morlighem, Mathieu (22 January 2019). "Four decades of Antarctic Ice Sheet mass balance from 1979–2017". Proceedings of the National Academy of Sciences. 116 (4): 1095–1103. Bibcode:2019PNAS..116.1095R. doi:10.1073/pnas.1812883116. PMC 6347714. PMID 30642972.
  42. ^ Amos, Jonathan (2020-03-23). "Climate change: Earth's deepest ice canyon vulnerable to melting". BBC.
  43. ^ Lauber, Julius; Hattermann, Torr; de Steur, Laura; Darelius, Elin; Auger, Matthis; Anders Nost, Ole; Moholdt, Geir (21 September 2023). "Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice". Nature Geoscience. 16: 877–885.
  44. ^ a b "Anticipating Future Sea Levels". EarthObservatory.NASA.gov. National Aeronautics and Space Administration (NASA). 2021. Archived from the original on 7 July 2021.
  45. ^ a b 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, USA: 1270–1272.
  46. ^ a b Crotti, Ilaria; Quiquet, Aurélien; Landais, Amaelle; Stenni, Barbara; Wilson, David J.; Severi, Mirko; Mulvaney, Robert; Wilhelms, Frank; Barbante, Carlo; Frezzotti, Massimo (10 September 2022). "Wilkes subglacial basin ice sheet response to Southern Ocean warming during late Pleistocene interglacials". Nature Communications. 13: 5328. doi:10.1038/s41467-022-32847-3. hdl:10278/5003813.
  47. ^ Garbe, Julius; Albrecht, Torsten; Levermann, Anders; Donges, Jonathan F.; Winkelmann, Ricarda (2020). "The hysteresis of the Antarctic Ice Sheet". Nature. 585 (7826): 538–544. Bibcode:2020Natur.585..538G. doi:10.1038/s41586-020-2727-5. PMID 32968257. S2CID 221885420.
source: https://en.wikipedia.org/wiki/East_Antarctic_Ice_Sheet

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