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Reduced sea ice production due to upwelled oceanic heat flux in Prydz Bay, East Antarctica

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Guo, G, Shi, Jiuxin, Gao, L, Tamura, T and Williams, GD ORCID: 0000-0003-1769-8356 2019 , 'Reduced sea ice production due to upwelled oceanic heat flux in Prydz Bay, East Antarctica' , Geophysical Research Letters, vol. 46, no. 9 , pp. 4782-4789 , doi: 10.1029/2018GL081463.

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Abstract

The coastal shelf region of East Antarctica is hypothesized to be shielded from the offshore heat of Circumpolar Deep Water (CDW) due to the dynamic barrier of the Antarctic Slope Front. Yet modified CDW (mCDW) intrudes into the coastal environment in key locations, with impacts on dense shelf water formation and ocean/ice shelf interaction that remain largely unquantified. Using moored measurements and conductivity‐temperature‐depth‐instrumented seal hydrographic data collected in Prydz Bay, East Antarctica, we find buoyancy‐driven upwelling of mCDW into the subsurface (~50 m) layer of the southeastern embayment. Wintertime convection extends as deep as 300 m, entraining heat of the upwelled mCDW to the surface. Accumulated sensible heat supply to the surface through deep convection during June–July reduces the potential sea ice production by 45% in the Davis Polynya, demonstrating that stronger/warmer mCDW intrusions onto the shelf will likely reduce the shelf water density and threaten Antarctic Bottom Water formation.

Item Type: Article
Authors/Creators:Guo, G and Shi, Jiuxin and Gao, L and Tamura, T and Williams, GD
Keywords: sensible heat, mCDW, upwell, convection, sea ice production, East Antarctica
Journal or Publication Title: Geophysical Research Letters
Publisher: Amer Geophysical Union
ISSN: 0094-8276
DOI / ID Number: 10.1029/2018GL081463
Copyright Information:

Copyright 2019 the authors. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/

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