Major Ice Sheet Change in the Weddell Sea Sector of West Antarctica Over the Last 5,000 Years

Major Ice Sheet Change in the Weddell Sea Sector of West Antarctica Over the Last 5,000 Years
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过去 5000 年来南极洲西部威德尔海区冰盖的主要变化

DOI:
10.1029/2019rg000651
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发表时间:
2019
影响因子:
25.2
通讯作者:
Siegert M
Siegert M
中科院分区:
地球科学1区
文献类型:
--
作者:
Siegert M

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直到最近,人们对南极西部冰盖的威德尔海部分知之甚少。在过去10年中,各种考察和数值模拟实验增进了对其冰川学、冰川地质学和构造背景的了解。该地区最大的两条冰流位于陡峭的反向斜坡床上,尽管容易受到变化的影响,但卫星观测显示当代稳定性。然而,有明确的证据表明,在过去的几千年里,冰盖发生了重大的重新配置。准确地了解冰盖在过去是如何以及何时发生变化的,将使我们更好地了解它现在是否处于危险之中。对于这段冰川历史,有两种相互竞争的假说。在一个,冰盖退缩,并逐渐变薄,从末次冰期最大的位置。撤退停止在,或非常接近,在晚全新世的现在的位置。另外,在晚全新世,冰盖退缩显着的上游,其目前的接地线,然后提前到今天的位置,由于冰川均衡调整和冰架和冰升扶壁。这两种假设都有数据和理论支持,但都没有被明确地检验或证伪。在这里,我们回顾地球物理证据,以确定每个假设是如何形成的,在各自的冰川历史中存在不一致的地方,如何测试或调和它们,以及需要什么新的证据来达到西南极洲威德尔海地区晚全新世冰盖历史的共同模型。
Until recently, little was known about the Weddell Sea sector of the West Antarctic Ice Sheet. In the last 10 years, a variety of expeditions and numerical modelling experiments have improved knowledge of its glaciology, glacial geology and tectonic setting. Two of the sector's largest ice streams rest on a steep reverse‐sloping bed yet, despite being vulnerable to change, satellite observations show contemporary stability. There is clear evidence for major ice sheet reconfiguration in the last few thousand years, however. Knowing precisely how and when the ice sheet has changed in the past would allow us to better understand whether it is now at risk. Two competing hypotheses have been established for this glacial history. In one, the ice sheet retreated and thinned progressively from its Last Glacial Maximum position. Retreat stopped at, or very near, the present position in the Late Holocene. Alternatively, in the Late Holocene, the ice sheet retreated significantly upstream of its present grounding line and then advanced to today's location due to glacial isostatic adjustment and ice shelf and ice rise buttressing. Both hypotheses point to data and theory in their support yet neither has been unequivocally tested or falsified. Here we review geophysical evidence to determine how each hypothesis has been formed, where there are inconsistencies in the respective glacial histories, how they may be tested or reconciled, and what new evidence is required to reach a common model for the Late Holocene ice sheet history of the Weddell Sea sector of West Antarctica.
DOI: --
发表时间: 2001
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发表时间: 2017
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DOI: 10.1038/s41598-018-35182-0
发表时间: 2018-11-14
期刊: Scientific reports
影响因子: 4.6
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Jordan TA;Martin C;Ferraccioli F;Matsuoka K;Corr H;Forsberg R;Olesen A;Siegert M
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影响因子: 5.8
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DOI: 10.1130/g31920.1
发表时间: 2011
期刊: Geology
影响因子: 5.8
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