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Gill's model of the Antarctic Circumpolar Current, revisited: the role of latitudinal variations in wind stress

Marshall, David P.; Munday, David R.; Allison, Lesley C.; Hay, Russell J.; Johnson, Helen L.. 2016 Gill's model of the Antarctic Circumpolar Current, revisited: the role of latitudinal variations in wind stress. Ocean Modelling, 97. 37-51. 10.1016/j.ocemod.2015.11.010

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This article has been accepted for publication and will appear in a revised form in Ocean Modelling, published by Elsevier. Copyright Elsevier.
Gill’s model of the Antarctic Circumpolar Current AAM.pdf

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Abstract/Summary

Adrian Gill’s (1968) model of the Antarctic Circumpolar Current (ACC) is reinterpreted for a stratified, reduced-gravity ocean, where the barotropic streamfunction is replaced by the pycnocline depth, and the bottom drag coefficient by the Gent and McWilliams eddy diffusivity. The resultant model gives a simple description of the lateral structure of the ACC that is consistent with contemporary descriptions of ACC dynamics. The model is used to investigate and interpret the sensitivity of the ACC to the latitudinal profile of the surface wind stress. A substantial ACC remains when the wind jet is shifted north of the model Drake Passage, even by several thousand kilometers. The integral of the wind stress over the circumpolar streamlines is found to be a useful predictor of the magnitude of the volume transport through the model Drake Passage, although it is necessary to correct for basin-wide zonal pressure gradients in order to obtain good quantitative agreement.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.ocemod.2015.11.010
Programmes: BAS Programmes > BAS Programmes 2015 > Polar Oceans
ISSN: 14635003
Additional Keywords: Antarctic Circumpolar Current, ocean circulation, geostrophic eddies, wind stress, Drake Passage
Date made live: 30 Nov 2015 09:32 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/512332

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