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Eddy heat flux across the Antarctic Circumpolar Current estimated from sea surface height standard deviation

Citation

Foppert, A and Donohue, KA and Watts, DR and Tracey, KL, Eddy heat flux across the Antarctic Circumpolar Current estimated from sea surface height standard deviation, Journal of Geophysical Research: Oceans, 122, (8) pp. 6947-6964. ISSN 2169-9275 (2017) [Refereed Article]


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Copyright Statement

Copyright 2017. American Geophysical Union.

DOI: doi:10.1002/2017JC012837

Abstract

Eddy heat flux (EHF) is a predominant mechanism for heat transport across the zonally unbounded mean flow of the Antarctic Circumpolar Current (ACC). Observations of dynamically relevant, divergent, 4 year mean EHF in Drake Passage from the cDrake project, as well as previous studies of atmospheric and oceanic storm tracks, motivates the use of sea surface height (SSH) standard deviation, H*, as a proxy for depth‐integrated, downgradient, time‐mean EHF in the ACC. Statistics from the Southern Ocean State Estimate corroborate this choice and validate throughout the ACC the spatial agreement between H* and EHF seen locally in Drake Passage. Eight regions of elevated EHF are identified from nearly 23.5 years of satellite altimetry data. Elevated cross‐front exchange usually does not span the full latitudinal width of the ACC in each region, implying a hand‐off of heat between ACC fronts and frontal zones as they encounter the different EHF hot spots along their circumpolar path. Integrated along circumpolar streamlines, defined by mean SSH contours, there is a convergence of EHF in the ACC: 1.06 PW enters from the north and 0.02 PW exits to the south. Temporal trends in low‐frequency [EHF] are calculated in a running‐mean sense using H* from overlapping 4 year subsets of SSH. Significant increases in downgradient [EHF] magnitude have occurred since 1993 at Kerguelen Plateau, Southeast Indian Ridge, and the Brazil‐Malvinas Confluence, whereas the other five EHF hot spots have insignificant trends of varying sign.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, eddy heat fluxes, currents, interactions with bathymetry, eddies
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Understanding climate change not elsewhere classified
UTAS Author:Foppert, A (Dr Annie Foppert)
ID Code:140516
Year Published:2017
Web of Science® Times Cited:10
Deposited By:Australian Antarctic Program Partnership
Deposited On:2020-08-25
Last Modified:2020-09-10
Downloads:5 View Download Statistics

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