Subglacial discharge weakens the stability of the Ross Ice Shelf around the grounding line

IF 1.9 4区地球科学 Q3 ECOLOGY

Polar Research Pub Date : 2021-01-22 DOI:10.33265/POLAR.V40.3377

Yan Li, Hongling Shi, Yang Lu, Zizhan Zhang, Hui Xi

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引用次数: 2

Abstract

In this paper, we examine potential impact of discharge in Subglacial Lake Engelhardt, West Antarctica, on the stability of the Ross Ice Shelf around the grounding line by combining satellite altimetry and remote sensing images. According to satellite altimetry data from the Ice, Cloud and Land Elevation Satellite (ICESat; 2003–06), Subglacial Lake Engelhardt (SLE) discharged ca. 1.91 ± 0.04 km3 of water into the downstream region. The ice-surface record derived from ICESat (2006–09) and CryoSat-2 (2011–17) data shows that the lake gained ca. 2.09 ± 0.05 km3 of water during the refilling event following the drainage event, taking three times as much time to reach the previous water level before the discharge; the calculation demonstrates that water input from an upstream lake is unable to sustain water increase in SLE, indicating that the subglacial, hydrologic system and groundwater flow could have contributed to water increase in SLE via hydrologic networks. Satellite images captured surface depressions and crevasses at the drainage outlet point of hydrologic networks around the grounding line; satellite altimetry data show that the ice surface there is still depressing even though the subglacial discharge has finished, potentially reflecting the long-term impact of subglacial discharge on the stability of the immediate Ross Ice Shelf around the grounding line.

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冰下流量削弱了罗斯冰架在接地线附近的稳定性

在本文中，我们通过结合卫星测高和遥感图像，研究了南极洲西部恩格尔哈特冰川下湖的流量对接地线周围罗斯冰架稳定性的潜在影响。根据冰、云和陆地高程卫星（ICESat；2003-06）的卫星测高数据，冰川下恩格尔哈特湖（SLE）向下游地区排放了约1.91±0.04 km3的水。根据ICESat（2006–09）和CryoSat-2（2011–17）数据得出的冰面记录显示，在排水事件后的补给事件中，湖泊增加了约2.09±0.05 km3的水，需要三倍的时间才能达到排水前的水位；计算表明，上游湖泊的入水无法维持SLE的增水，表明冰下、水文系统和地下水流量可能通过水文网络对SLE的增水量做出了贡献。卫星图像捕捉到了接地线周围水文网络排水口处的地表洼地和决口；卫星测高数据显示，尽管冰下放电已经结束，但那里的冰面仍然令人沮丧，这可能反映了冰下放电对接地线附近罗斯冰架稳定性的长期影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polar Research 地学-地球科学综合

CiteScore

3.20

自引率

5.30%

发文量

审稿时长

>12 weeks

期刊介绍： Since 1982, Polar Research has been the international, peer-reviewed journal of the Norwegian Polar Institute, Norway''s central institution for research, environmental monitoring and mapping of the polar regions. Aiming to promote the exchange of scientific knowledge about the Arctic and Antarctic across disciplinary boundaries, Polar Research serves an international community of researchers and managers. As an open-access journal, Polar Research makes its contents freely available to the general public. Original primary research papers comprise the mainstay of Polar Research. Review articles, brief research notes, letters to the editor and book reviews are also included. Special issues are published from time to time. The scope of Polar Research encompasses research in all scientific disciplines relevant to the polar regions. These include, but are not limited to, the subfields of biology, ecology, geology, oceanography, glaciology and atmospheric science. Submissions from the social sciences and those focusing on polar management and policy issues are welcome. Contributions about Antarctica are particularly encouraged.