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Circum-Antarctic shoreward heat transport derived from an eddy- and tide-resolving simulation

Citation

Stewart, AL and Klocker, A and Menemenlis, D, Circum-Antarctic shoreward heat transport derived from an eddy- and tide-resolving simulation, Geophysical Research Letters, 45, (2) pp. 834-845. ISSN 0094-8276 (2018) [Refereed Article]


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Copyright Statement

Copyright 2018 American Geophysical Union

DOI: doi:10.1002/2017GL075677

Abstract

Almost all heat reaching the bases of Antarctica's ice shelves originates from warm Circumpolar Deep Water in the open Southern Ocean. This study quantifies the roles of mean and transient flows in transporting heat across almost the entire Antarctic continental slope and shelf using an ocean/sea ice model run at eddy- and tide-resolving (1/48░) horizontal resolution. Heat transfer by transient flows is approximately attributed to eddies and tides via a decomposition into time scales shorter than and longer than 1áday, respectively. It is shown that eddies transfer heat across the continental slope (ocean depths greater than 1,500ám), but tides produce a stronger shoreward heat flux across the shelf break (ocean depths between 500ám and 1,000ám). However, the tidal heat fluxes are approximately compensated by mean flows, leaving the eddy heat flux to balance the net shoreward heat transport. The eddy-driven cross-slope overturning circulation is too weak to account for the eddy heat flux. This suggests that isopycnal eddy stirring is the principal mechanism of shoreward heat transport around Antarctica, though likely modulated by tides and surface forcing.

Item Details

Item Type:Refereed Article
Keywords:Antarrctic margins, tides, eddies, heat transport
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
UTAS Author:Klocker, A (Dr Andreas Klocker)
ID Code:123890
Year Published:2018
Web of Science® Times Cited:15
Deposited By:Oceans and Cryosphere
Deposited On:2018-01-31
Last Modified:2018-11-26
Downloads:27 View Download Statistics

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