Combined wind vector and sea state impact on ocean nadir-viewing Ku- and C-band radar cross-sections

Type Article
Date 2006-03
Language English
Author(s) Tran Ngan1, Chapron Bertrand2
Affiliation(s) 1 : Collecte Localisat Satellites, Direct Oceanog Spatiale, F-31520 Ramonville St Agne, France.
2 : IFREMER, Ctr Brest, Ctr ERS Archivage & Traietment, F-29280 Plouzane, France.
Source Sensors (1424-8220) (Molecular Diversity Preservation International), 2006-03 , Vol. 6 , N. 3 , P. 193-207
DOI 10.3390/s6030193
WOS© Times Cited 12
Keyword(s) altimeter, radar cross section, polarization, wind direction, sea state
Abstract The authors report the first results in studying the polarization anisotropy of the microwave backscatter from nadir observations provided by Jason-1 altimeter in both Ku- and C-band. A small but clear wind direction signal for wind speeds above 6 m/s is revealed. These azimuthal variations of radar cross-section increase with increasing wind speed up to 14 m/s. The signatures then level off at higher winds. These results extend, for the first time, recent theoretical improved scattering approximation, and point some similarities between scattering and emission mechanisms at nadir. The observed directional effect can thus be interpreted as a signature of the curvature anisotropy of wind-generated short-scale waves. Sensitivities to both wind speed and sea state are also reported in the present analysis.
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