Does direct impact of SST on short wind waves matter for scatterometry?

Type Article
Date 2012-06
Language English
Author(s) Grodsky Semyon A.1, Kudryavtsev Vladimir N.2, Bentamy Abderrahim3, Carton James A.1, Chapron Bertrand2, 3
Affiliation(s) 1 : Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA.
2 : Russian State Hydrometeorol Univ, Nansen Int Environm & Remote Sensing Ctr, St Petersburg, Russia.
3 : Inst Francais Rech Exploitat Mer, Plouzane, France.
Source Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2012-06 , Vol. 39 , N. L12602 , P. 6 pp
DOI 10.1029/2012GL052091
WOS© Times Cited 18
Abstract Scatterometer radar backscatter depends on the relationship linking surface stress and surface roughness. SST can alter the growth rate of centimeter-scale waves through its impact on air and water density and water viscosity. This SST-dependency has not been included in the standard Geophysical Model Functions. This study uses a radar imaging model to evaluate this SST-dependence and compares the results to observations from QuikScat Ku-band and ASCAT C-band scatterometers. A SST correction could raise wind speeds by up to 0.2 ms(-1) in the storm track region of the Southern Ocean for C-band scatterometers. For the higher frequency Ku-band scatterometers, a SST-induced reduction up to 0.4 ms(-1) is predicted south of 60(-S), where SST is cold and winds are moderate. Citation: Grodsky, S. A., V. N. Kudryavtsev, A. Bentamy, J. A. Carton, and B. Chapron (2012), Does direct impact of SST on short wind waves matter for scatterometry?, Geophys. Res. Lett., 39, L12602, doi: 10.1029/2012GL052091.
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