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Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends

Citation

Doddridge, EW and Marshall, J and Song, H and Campin, J-M and Kelley, M and Nazarenko, L, Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends, Geophysical Research Letters, 46, (8) pp. 4365-4377. ISSN 0094-8276 (2019) [Refereed Article]


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Copyright Statement

2019. American Geophysical Union.

DOI: doi:10.1029/2019GL082758

Abstract

Anthropogenic influences have led to a strengthening and poleward shift of westerly winds over the Southern Ocean, especially during austral summer. We use observations, an idealized eddy-resolving ocean sea ice channel model, and a global coupled model to explore the Southern Ocean response to a step change in westerly winds. Previous work hypothesized a two time scale response for sea surface temperature. Initially, Ekman transport cools the surface before sustained upwelling causes warming on decadal time scales. The fast response is robust across our models and the observations: We find Ekman-driven cooling in the mixed layer, mixing-driven warming below the mixed layer, and a small upwelling-driven warming at the temperature inversion. The long-term response is inaccessible from observations. Neither of our models shows a persistent upwelling anomaly, or long-term, upwelling-driven subsurface warming. Mesoscale eddies act to oppose the anomalous wind-driven upwelling, through a process known as eddy compensation, thereby preventing long-term warming.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, ozone
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Doddridge, EW (Dr Edward Doddridge)
ID Code:148782
Year Published:2019
Web of Science® Times Cited:18
Deposited By:Oceans and Cryosphere
Deposited On:2022-02-09
Last Modified:2022-03-04
Downloads:5 View Download Statistics

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