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Wind work on the geostrophic ocean circulation: An observational study of the effect of small scales in the wind stress

Hughes, C. W.; Wilson, C. 2008 Wind work on the geostrophic ocean circulation: An observational study of the effect of small scales in the wind stress. Journal of Geophysical Research, 113 (2), C02016. 10, pp. 10.1029/2007JC004371

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Abstract/Summary

We use QuikSCAT scatterometer data, together with geostrophic surface currents calculated from a combination of satellite altimetry, gravity and drifter data, to investigate the rate of work done on the geostrophic circulation by wind stress. In particular, we test the suggestion that accounting for ocean currents in the calculation of stress from 10 m winds can result in a reduction of 20–35% in the wind work, compared with an approximate calculation in which currents are not accounted for. We calculate the predicted effect of accounting for ocean currents to be a reduction in power of about 0.19 TW, and find a total power input from observations which include this effect to be 0.76 TW, smaller than earlier estimates by about the right amount. By recalculating the power input using smoothed wind stresses or currents, we demonstrate that the effect of ocean currents is visible in the midlatitude data, and close to the predicted value. Proof that the data are adequate to resolve the effect in the tropics, however, is lacking, suggesting that additional processes may also be important in this region.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2007JC004371
Programmes: Oceans 2025 > Climate, ocean circulation and sea level
POL Programmes > Sea-level, bottom pressure and space geodesy > Continuous ocean monitoring methods
ISSN: 0148-0227
Additional Information. Not used in RCUK Gateway to Research.: An edited version of this paper was published by AGU 2008 American Geophysical Union. Not subject to US Copyright
Additional Keywords: Energy; Wind Stress;General Circulation Model; Surface Velocity Model; Topex/Poseidon Input; Curl
NORA Subject Terms: Marine Sciences
Date made live: 18 Dec 2008 14:35
URI: http://nora.nerc.ac.uk/id/eprint/5013

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