Reduction of near-inertial energy through the dependence of wind stress on the ocean-surface velocity

Rath, Willi, Greatbatch, Richard J. and Zhai, Xiaoming (2013) Reduction of near-inertial energy through the dependence of wind stress on the ocean-surface velocity. Journal of Geophysical Research - Oceans, 118 (6). pp. 2761-2773. ISSN 2169-9275

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Abstract

A realistic primitive-equation model of the Southern Ocean at eddying spatial resolution is used to examine the effect of ocean-surface-velocity dependence of the wind stress on the strength of near-inertial oscillations. Accounting for the ocean-surface-velocity dependence of the wind stress leads to a large reduction of wind-induced near-inertial energy of approximately 40% and of wind power input into the near-inertial frequency band of approximately 20%. A large part of this reduction can be explained by the leading-order modification to the wind stress if the ocean-surface velocity is included. The strength of the reduction is shown to be modulated by the inverse of the ocean-surface-mixed-layer depth. We conclude that the effect of surface-velocity dependence of the wind stress should be taken into account when estimating the wind-power input into the near-inertial frequency band and when estimating near-inertial energy levels in the ocean due to wind forcing.

Item Type: Article
Uncontrolled Keywords: near-inertial oscillations,wind-stress parameterization,southern ocean,ocean-modeling
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Pure Connector
Date Deposited: 23 Oct 2013 21:50
Last Modified: 21 Apr 2020 22:02
URI: https://ueaeprints.uea.ac.uk/id/eprint/43798
DOI: 10.1002/jgrc.20198

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