Variability and trends in Southern Ocean eddy activity in 1/12° ocean model simulations.

Patara, Lavinia , Böning, Claus W. and Biastoch, Arne (2016) Variability and trends in Southern Ocean eddy activity in 1/12° ocean model simulations. Open Access Geophysical Research Letters, 43 . pp. 4517-4523. DOI 10.1002/2016GL069026.

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Abstract

The response of eddy kinetic energy (EKE) to the strengthening of Southern Hemisphere winds occurring since the 1950s is investigated with a global ocean model having a resolution of 1/12° in the Antarctic Circumpolar Current domain. The simulations expose regional differences in the relative importance of stochastic and wind-related contributions to inter-annual EKE changes. In the Pacific and Indian sectors the model captures the EKE variability observed since 1993 and confirms previous hypotheses of a lagged response to regional wind stress anomalies. Here, the multi-decadal trend in wind stress is reflected in an increase in EKE typically exceeding 5 cm2 sec-2 decade-1. In the western Atlantic EKE variability is mostly stochastic, is weakly correlated with wind fluctuations, and its multi-decadal trends are close to zero. The non-uniform distribution of wind-related changes in the eddy activity could affect the regional patterns of ocean circulation and biogeochemical responses to future climate change.

Document Type: Article
Keywords: mesoscale eddies; eddy kinetic energy;S outhern Ocean; climate change; ocean model
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > The Future Ocean - Cluster of Excellence > FO-R11
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2016GL069026
ISSN: 0094-8276
Related URLs:
Projects: Future Ocean, NEMO, DRAKKAR, Opendap
Expeditions/Models/Experiments:
Date Deposited: 03 May 2016 11:39
Last Modified: 26 Feb 2019 08:30
URI: http://oceanrep.geomar.de/id/eprint/32342

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