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Statistical comparisons of observed and ECMWF modelled open ocean surface drag

Statistical comparisons of observed and ECMWF modelled open ocean surface drag
Statistical comparisons of observed and ECMWF modelled open ocean surface drag
The surface-drag coefficients of two versions of the ECMWF's atmosphere–wave model are compared with those of uncoupled model versions and with those of inertial-dissipation measurements in the open ocean made by the RRS Discovery. It is found that the mean drag resulting from the latest coupled version is on average equal to that of the uncoupled version. However, both have a positive bias when compared with the RRS Discovery observations. This bias is discussed, also in the light of other observational open ocean data. In the second part of the paper, bulk parameterizations with and without parameters of collocated sea-state data are validated against the Discovery observations. Using published estimates of the error in friction velocity and the neutral 10-m winds, all bulk parameterizations score low on goodness-of-fit tests. The lowest scores are obtained for the constant Charnock parameter case, whereas the highest scores are obtained for a wave-age-dependent parameterization. On–off experiments are made for the corrections to the inertial-dissipation data that have been proposed in previous studies. These corrections concern the measurement height and the direct wave-induced turbulence in the lower atmosphere. The first correction results in a slightly better agreement, but the second reduces the goodness-of-fit of the bulk parameterizations.
0022-3670
1010-1027
Bonekamp, H.
98af184c-6ad8-429f-ab86-aa2ba66de0a7
Komen, G.J.
f2a46ee2-5b8c-4c9c-8870-222a285d80de
Sterl, A.
edc19096-737b-44f2-8d49-95203d6b9b17
Janssen, P.A.E.M.
b8f40cd3-711f-4184-9536-34d25e2c735d
Taylor, P.K.
3ef27388-c14e-4f4b-85fc-97bb17d089d2
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07
Bonekamp, H.
98af184c-6ad8-429f-ab86-aa2ba66de0a7
Komen, G.J.
f2a46ee2-5b8c-4c9c-8870-222a285d80de
Sterl, A.
edc19096-737b-44f2-8d49-95203d6b9b17
Janssen, P.A.E.M.
b8f40cd3-711f-4184-9536-34d25e2c735d
Taylor, P.K.
3ef27388-c14e-4f4b-85fc-97bb17d089d2
Yelland, M.J.
3b2e2a38-334f-430f-b110-253a0a835a07

Bonekamp, H., Komen, G.J., Sterl, A., Janssen, P.A.E.M., Taylor, P.K. and Yelland, M.J. (2002) Statistical comparisons of observed and ECMWF modelled open ocean surface drag. Journal of Physical Oceanography, 32 (3), 1010-1027. (doi:10.1175/1520-0485(2002)032<1010:SCOOAE>2.0.CO;2).

Record type: Article

Abstract

The surface-drag coefficients of two versions of the ECMWF's atmosphere–wave model are compared with those of uncoupled model versions and with those of inertial-dissipation measurements in the open ocean made by the RRS Discovery. It is found that the mean drag resulting from the latest coupled version is on average equal to that of the uncoupled version. However, both have a positive bias when compared with the RRS Discovery observations. This bias is discussed, also in the light of other observational open ocean data. In the second part of the paper, bulk parameterizations with and without parameters of collocated sea-state data are validated against the Discovery observations. Using published estimates of the error in friction velocity and the neutral 10-m winds, all bulk parameterizations score low on goodness-of-fit tests. The lowest scores are obtained for the constant Charnock parameter case, whereas the highest scores are obtained for a wave-age-dependent parameterization. On–off experiments are made for the corrections to the inertial-dissipation data that have been proposed in previous studies. These corrections concern the measurement height and the direct wave-induced turbulence in the lower atmosphere. The first correction results in a slightly better agreement, but the second reduces the goodness-of-fit of the bulk parameterizations.

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Published date: March 2002

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Local EPrints ID: 55203
URI: http://eprints.soton.ac.uk/id/eprint/55203
ISSN: 0022-3670
PURE UUID: d31519cc-a822-4f2e-84c9-0638508f0a19

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Date deposited: 24 Jul 2008
Last modified: 25 Nov 2019 19:17

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Contributors

Author: H. Bonekamp
Author: G.J. Komen
Author: A. Sterl
Author: P.A.E.M. Janssen
Author: P.K. Taylor
Author: M.J. Yelland

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