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Wind stress measurements from the open ocean corrected for air flow distortion by the ship

Yelland, M.J. and Taylor, P.K. (1996) Wind stress measurements from the open ocean corrected for air flow distortion by the ship Journal of Physical Oceanography, 26, (4), pp. 541-558. (doi:10.1175/1520-0485(1996)026<0541:WSMFTO>2.0.CO;2).

Record type: Article


An automatic inertial dissipation system was used during three cruises of the RRS Discovery in the Southern Ocean to obtain a large dataset of open ocean wind stress estimates. The wind speed varied from near calm to 26 m s?1, and the sea-air temperature differences ranged from ?15° to +7°C. The data showed that the assumption of a balance between local production and dissipation of turbulent kinetic energy is false and that the sign and magnitude of the imbalance depends critically on both stability and wind speed. The wide range of stability conditions allowed a new formulation for the nondimensional dissipation function under diabatic conditions.
A minimum in the 10-m neutral value of the drag coefficient occurred at 6 m s?1. At lower wind speeds the data were fitted by the relationship
where U10n. is the 10-m neutral wind speed (m s?1). At higher wind speeds
which gives drag coefficients that are about 10% higher than those from previous open ocean studies (which assumed a balance between production and dissipation). Wave measurement suggested that the sea state was not, on average, fully developed at wind speeds above 15 m s?1. However, contrary to findings from other studies, no large anomalies in the drag coefficient were detected despite the range of conditions and sea states encountered. It is believed that the ideal conditions (such as the absence of swell) needed to defect the effects of sea state on the wind stress may occur rather infrequently over the open ocean.

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Published date: April 1996
Organisations: National Oceanography Centre,Southampton


Local EPrints ID: 55294
ISSN: 0022-3670
PURE UUID: 1b70c751-7d7d-4e28-8b74-47eefd2b4ce3

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Date deposited: 28 Jul 2008
Last modified: 17 Jul 2017 14:33

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Author: M.J. Yelland
Author: P.K. Taylor

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