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

Citation

Guo, G and Shi, J and Gao, L and Tamura, T and Williams, GD, Reduced sea ice production due to upwelled oceanic heat flux in Prydz Bay, East Antarctica, Geophysical Research Letters, 46, (9) pp. 4782-4789. ISSN 0094-8276 (2019) [Refereed Article]


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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/

DOI: doi:10.1029/2018GL081463

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 Details

Item Type:Refereed Article
Keywords:sensible heat, mCDW, upwell, convection, sea ice production, East Antarctica
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Tamura, T (Dr Takeshi Tamura)
UTAS Author:Williams, GD (Associate Professor Guy Williams)
ID Code:139600
Year Published:2019
Web of Science® Times Cited:6
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2020-06-23
Last Modified:2020-07-22
Downloads:3 View Download Statistics

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