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漩涡与凹坑：南极冰架多波束成像揭示的冰基融化现象

Swirls and scoops: Ice base melt revealed by multibeam imagery of an Antarctic ice shelf.

作者信息

Wåhlin Anna, Alley Karen E, Begeman Carolyn, Hegrenæs Øyvind, Yuan Xiaohan, Graham Alastair G C, Hogan Kelly, Davis Peter E D, Dotto Tiago S, Eayrs Clare, Hall Robert A, Holland David M, Kim Tae Wan, Larter Robert D, Ling Li, Muto Atsuhiro, Pettit Erin C, Schmidt Britney E, Snow Tasha, Stedt Filip, Washam Peter M, Wahlgren Stina, Wild Christian, Wellner Julia, Zheng Yixi, Heywood Karen J

机构信息

Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden.

Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada.

出版信息

Sci Adv. 2024 Aug 2;10(31):eadn9188. doi: 10.1126/sciadv.adn9188. Epub 2024 Jul 31.

DOI:10.1126/sciadv.adn9188
PMID:39083596
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11290488/
Abstract

Knowledge gaps about how the ocean melts Antarctica's ice shelves, borne from a lack of observations, lead to large uncertainties in sea level predictions. Using high-resolution maps of the underside of Dotson Ice Shelf, West Antarctica, we reveal the imprint that ice shelf basal melting leaves on the ice. Convection and intermittent warm water intrusions form widespread terraced features through slow melting in quiescent areas, while shear-driven turbulence rapidly melts smooth, eroded topographies in outflow areas, as well as enigmatic teardrop-shaped indentations that result from boundary-layer flow rotation. Full-thickness ice fractures, with bases modified by basal melting and convective processes, are observed throughout the area. This new wealth of processes, all active under a single ice shelf, must be considered to accurately predict future Antarctic ice shelf melt.

摘要

由于缺乏观测数据，人们对海洋如何融化南极洲冰架的了解存在知识空白，这导致海平面预测存在很大的不确定性。利用南极洲西部多森冰架底部的高分辨率地图，我们揭示了冰架底部融化在冰面上留下的印记。对流和间歇性暖水侵入通过在静止区域缓慢融化形成了广泛的梯田状特征，而剪切驱动的湍流则在流出区域迅速融化光滑的侵蚀地形，以及由边界层流旋转形成的神秘泪滴状凹痕。在整个区域都观察到了全厚度的冰裂缝，其底部因底部融化和对流过程而发生了改变。要准确预测未来南极冰架的融化，必须考虑在单个冰架下所有这些活跃的新过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/a59945b374ae/sciadv.adn9188-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/68d3093a9c57/sciadv.adn9188-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/623f3259709b/sciadv.adn9188-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/9245bbe98d0f/sciadv.adn9188-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/67bd3c33825d/sciadv.adn9188-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/0e4d91c33003/sciadv.adn9188-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/a59945b374ae/sciadv.adn9188-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/68d3093a9c57/sciadv.adn9188-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/c4aa475f7d9e/sciadv.adn9188-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/623f3259709b/sciadv.adn9188-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/9245bbe98d0f/sciadv.adn9188-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/67bd3c33825d/sciadv.adn9188-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/0e4d91c33003/sciadv.adn9188-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/074e/11290488/a59945b374ae/sciadv.adn9188-f9.jpg

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本文引用的文献

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Direct observations of melting, freezing, and ocean circulation in an ice shelf basal crevasse.对冰架底部裂缝中的融化、冻结和海洋环流的直接观测。
Sci Adv. 2023 Oct 27;9(43):eadi7638. doi: 10.1126/sciadv.adi7638.
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Proc Natl Acad Sci U S A. 2021 Feb 9;118(6). doi: 10.1073/pnas.2007541118.
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Interannual variations in meltwater input to the Southern Ocean from Antarctic ice shelves.南极冰架对南大洋融水输入的年际变化。
Nat Geosci. 2020 Sep;13(9):616-620. doi: 10.1038/s41561-020-0616-z. Epub 2020 Aug 10.
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Ice front blocking of ocean heat transport to an Antarctic ice shelf.海冰前沿阻断海洋热量向南极冰架输送。
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Troughs developed in ice-stream shear margins precondition ice shelves for ocean-driven breakup.海流在冰流剪切边缘形成的深槽使冰架易于在海洋作用下断裂。
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