Topographic Control of Southern Ocean Gyres and the Antarctic Circumpolar Current: A Barotropic Perspective

Patmore, Ryan D., Holland, Paul R., Munday, David R., Naveira Garabato, Alberto C., Stevens, David P. and Meredith, Michael P. (2019) Topographic Control of Southern Ocean Gyres and the Antarctic Circumpolar Current: A Barotropic Perspective. Journal of Physical Oceanography, 49 (12). 3221–3244. ISSN 0022-3670

[img]
Preview
PDF (Accepted_Manuscript) - Submitted Version
Download (13MB) | Preview

Abstract

In the Southern Ocean the Antarctic Circumpolar Current is significantly steered by large topographic features, and sub-polar gyres form in their lee. The geometry of topographic features in the Southern Ocean is highly variable, but the influence of this variation on the large-scale flow is poorly understood. Using idealised barotropic simulations of a zonal channel with a meridional ridge, it is found that the ridge geometry is important for determining the net zonal volume transport. A relationship is observed between ridge width and volume transport that is determined by the form stress generated by the ridge. Gyre formation is also highly reliant on the ridge geometry. A steep ridge allows gyres to form within regions of unblocked geostophic ( f /H) contours, with an increase in gyre strength as the ridge width is reduced. These relationships between ridge width, gyre strength, and net zonal volume transport emerge in order to simultaneously satisfy the conservation of momentum and vorticity.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 27 Nov 2019 01:58
Last Modified: 15 Oct 2020 23:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/73072
DOI: 10.1175/JPO-D-19-0083.1

Actions (login required)

View Item View Item