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Phased Response of the Subpolar Southern Ocean to Changes in Circumpolar Winds

Naveira Garabato, AC; Dotto, TS; Hooley, J; Bacon, S; Tsamados, M; Ridout, A; Frajka-Williams, EE; ... Meredith, MP; + view all (2019) Phased Response of the Subpolar Southern Ocean to Changes in Circumpolar Winds. Geophysical Research Letters , 46 (11) pp. 6024-6033. 10.1029/2019GL082850. Green open access

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Abstract

The response of the subpolar Southern Ocean (sSO) to wind forcing is assessed using satellite radar altimetry. sSO sea level exhibits a phased, zonally coherent, bimodal adjustment to circumpolar wind changes, involving comparable seasonal and interannual variations. The adjustment is effected via a quasi‐instantaneous exchange of mass between the Antarctic continental shelf and the sSO to the north, and a 2‐month‐delayed transfer of mass between the wider Southern Ocean and the subtropics. Both adjustment modes are consistent with an Ekman‐mediated response to variations in surface stress. Only the fast mode projects significantly onto the surface geostrophic flow of the sSO; thus, the regional circulation varies in phase with the leading edge of sSO sea level variability. The surface forcing of changes in the sSO system is partly associated with variations of surface winds linked to the Southern Annular Mode and is modulated by sea ice cover near Antarctica.

Type: Article
Title: Phased Response of the Subpolar Southern Ocean to Changes in Circumpolar Winds
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2019GL082850
Publisher version: https://doi.org/10.1029/2019GL082850
Language: English
Additional information: © 2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10077678
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