Four-decade record of pervasive grounding line retreat along the Bellingshausen margin of West Antarctica

被引：48

作者：

Christie, Frazer D. W. ^{[1
]}

Bingham, Robert G. ^{[1
]}

Gourmelen, Noel ^{[1
]}

Tett, Simon F. B. ^{[1
]}

Muto, Atsuhiro ^{[2
]}

机构：

[1] Univ Edinburgh, Sch GeoSci, Edinburgh, Midlothian, Scotland

[2] Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 11期

关键词：

Landsat; InSAR; grounding line; Pine Island Glacier; Antarctica; ice-ocean interaction; PINE ISLAND GLACIER; ICE-SHEET; KOHLER GLACIERS; SHELF; ZONE; SEA; WIDESPREAD; THICKNESS; THWAITES; SURFACE;

D O I：

10.1002/2016GL068972

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Changes to the grounding line, where grounded ice starts to float, can be used as a remotely sensed measure of ice-sheet susceptibility to ocean-forced dynamic thinning. Constraining this susceptibility is vital for predicting Antarctica's contribution to rising sea levels. We use Landsat imagery to monitor grounding line movement over four decades along the Bellingshausen margin of West Antarctica, an area little monitored despite potential for future ice losses. We show that similar to 65% of the grounding line retreated from 1990 to 2015, with pervasive and accelerating retreat in regions of fast ice flow and/or thinning ice shelves. Venable Ice Shelf confounds expectations in that, despite extensive thinning, its grounding line has undergone negligible retreat. We present evidence that the ice shelf is currently pinned to a sub-ice topographic high which, if breached, could facilitate ice retreat into a significant inland basin, analogous to nearby Pine Island Glacier.

引用

页码：5741 / 5749

页数：9

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