Explaining the Weddell Polynya - A large ocean eddy shed at Maud Rise

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Abstract

Satellite observations have shown the occasional occurrence of a large opening in the sea-ice cover of the Weddell Sea, Antarctica, a phenomenon known as the Weddell Polynya. The transient appearance, position, size, and shape of the polynya is explained here by a mechanism by which modest variations in the large-scale oceanic flow past the Maud Rise seamount cause a horizontal cyclonic eddy to be shed from its northeast flank. The shed eddy transmits a divergent Ekman stress into the sea ice, leading to a crescent-shaped opening in the pack. Atmospheric thermodynamical interaction further enhances the opening by inducing oceanic convection. A sea-ice - ocean computer model simulation vividly demonstrates how this mechanism fully accounts for the characteristics that mark Weddell Polynya events.

Original languageEnglish (US)
Pages (from-to)1697-1700
Number of pages4
JournalScience
Volume292
Issue number5522
DOIs
StatePublished - Jun 1 2001

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ASJC Scopus subject areas

  • General

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