FN Archimer Export Format PT J TI Combined wind vector and sea state impact on ocean nadir-viewing Ku- and C-band radar cross-sections BT AF TRAN, Ngan CHAPRON, Bertrand AS 1:1;2:2; FF 1:;2:PDG-DOP-DCB-OPS-LOS; C1 Collecte Localisat Satellites, Direct Oceanog Spatiale, F-31520 Ramonville St Agne, France. IFREMER, Ctr Brest, Ctr ERS Archivage & Traietment, F-29280 Plouzane, France. C2 CLS, FRANCE IFREMER, FRANCE SI BREST SE PDG-DOP-DCB-OPS-LOS IN WOS Ifremer jusqu'en 2018 copubli-france IF 1.373 TC 12 UR https://archimer.ifremer.fr/doc/00004/11557/8150.pdf LA English DT Article DE ;altimeter;radar cross section;polarization;wind direction;sea state AB 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. PY 2006 PD MAR SO Sensors SN 1424-8220 PU Molecular Diversity Preservation International VL 6 IS 3 UT 000237609200005 BP 193 EP 207 DI 10.3390/s6030193 ID 11557 ER EF