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Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea
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Explaining the Weddell Polynya--a large ocean eddy shed at Maud Rise.

D M Holland1

  • 1Center for Atmosphere-Ocean Science, Courant Institute of Mathematical Sciences and Faculty of Arts and Science, New York University, New York, NY 10012, USA. holland@cims.nyu.edu

Science (New York, N.Y.)
|June 2, 2001
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The Weddell Polynya, a large opening in Antarctic sea ice, is caused by ocean currents interacting with the Maud Rise seamount. This interaction creates an eddy that opens the ice, with atmospheric changes enhancing the effect.

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Area of Science:

  • Oceanography
  • Sea Ice Physics
  • Antarctic Climate Dynamics

Background:

  • The Weddell Polynya is a recurring large opening in Antarctic sea ice observed via satellite.
  • Its transient nature and specific characteristics have not been fully explained by previous mechanisms.

Purpose of the Study:

  • To elucidate the physical mechanism responsible for the formation, location, size, and shape of the Weddell Polynya.
  • To validate the proposed mechanism using a coupled sea-ice-ocean computer model.

Main Methods:

  • Analysis of satellite observations of the Weddell Polynya.
  • Theoretical explanation involving oceanic flow past the Maud Rise seamount.
  • Numerical simulation using a coupled sea-ice-ocean model.

Main Results:

  • Modest variations in large-scale oceanic flow past Maud Rise generate a cyclonic eddy.
  • The shed eddy induces divergent Ekman stress, creating a crescent-shaped opening in the sea ice.
  • Atmospheric interactions enhance the polynya by triggering oceanic convection.

Conclusions:

  • The proposed mechanism, driven by oceanic eddies shed from Maud Rise, fully explains Weddell Polynya events.
  • The interplay between ocean dynamics, sea ice, and atmosphere is crucial for polynya formation.