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Jet jumping: low-frequency variability in the Southern Ocean

Citation

Chapman, CC and Hogg, AMCC, Jet jumping: low-frequency variability in the Southern Ocean, Journal of Physical Oceanography, 43, (5) pp. 990-1003. ISSN 0022-3670 (2013) [Refereed Article]


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DOI: doi:10.1175/JPO-D-12-0123.1

Abstract

The authors study intrinsic variability in the position of jets in a b-plane channel ocean with simple topography using a quasigeostrophic numerical model. This study links the variability in jet position with abyssal anticyclones that form as a result of interaction of mesoscale eddies and subsurface topography, reminiscent of such flows as the Zapiola anticyclone. A simple dynamical framework explaining this behavior is developed. In this framework, this study shows that the topographic anticyclones form closed regions of homogenized yet time-varying potential vorticity. Neighboring topographic anticyclones are coupled by eddy fluxes. Interaction of a baroclinic jet with these two (or more) anticyclones can drive variability in local jet strength. Predictions of the dynamical framework are then compared with the results of the numerical model, and it is demonstrated that this model has merit in explaining the observed model variability. This study argues that this simple mode of variability has relevance for the ocean.

Item Details

Item Type:Refereed Article
Keywords:channel flows, eddies, Southern Ocean, topographic effects
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Hogg, AMCC (Dr Andrew Hogg)
ID Code:119514
Year Published:2013
Web of Science® Times Cited:5
Deposited By:Centre for Oceans and Cryosphere
Deposited On:2017-08-02
Last Modified:2017-08-02
Downloads:0

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