Recent thinning and migration of the Western Divide, central West Antarctica

被引：36

作者：

Conway, H. ^{[1
]}

Rasmussen, L. A. ^{[1
]}

机构：

[1] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

基金：

美国国家科学基金会;

关键词：

Earth sciences;

D O I：

10.1029/2009GL038072

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report observations that show the Western Divide, between the Ross and Amundsen Sea sectors in West Antarctica, is currently thinning similar to 0.08 m a(-1) and migrating toward the Ross Sea at 10 m a(-1). The asymmetric pattern of thickness change across the divide is not caused by changes in the accumulation gradient, but rather by dynamical thinning that is stronger in the Amundsen Sea sector than in the Ross Sea sector. Available geological and glaciological data indicate that this pattern of thinning has persisted for at least two millennia, with increased asymmetry likely over the past few centuries. Our data however, are not sufficient to determine whether the present-day migration of the Western Divide is a response to long-term (millennial) forcing, shorter-term (centennial) forcing, or both. Citation: Conway, H., and L. A. Rasmussen (2009), Recent thinning and migration of the Western Divide, central West Antarctica, Geophys. Res. Lett., 36, L12502, doi: 10.1029/2009GL038072.

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