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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L12502,
5 PP., 2009
doi:10.1029/2009GL038072
Recent thinning and migration of the Western Divide, central West Antarctica
Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
We report observations that show the Western Divide, between the Ross and Amundsen Sea sectors in West Antarctica, is currently thinning ∼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.
Received 6 March 2009; accepted 22 May 2009; published 23 June 2009.
Citation: (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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