TY - JOUR T1 - Effect of long waves on Ku-band ocean radar backscatter at low incidence angles using TRMM and altimeter data A1 - Tran,Ngan A1 - Chapron,Bertrand A1 - Vandemark,D AD - Collecte Localisat Satellites, Space Oceanog Div, F-31520 St Agne, France. AD - IFREMER, Ctr Brest, F-29280 Plouzane, France. AD - Univ New Hampshire, Ocean Proc Analy Lab, Durham, NH 03824 USA. UR - https://archimer.ifremer.fr/doc/00000/3299/ DO - 10.1109/LGRS.2007.896329 KW - Space borne radar KW - Scattering KW - Radar cross section KW - Altimetry N2 - This letter uses a large ocean satellite data set to document relationships between Ku-band radar backscatter (sigma-0) of the sea surface, near-surface wind speed (U), and ocean wave height (SWH). The observations come from satellite crossovers of the Tropical Rainfall Mapping Mission (TRMM) Precipitation Radar (PR) and two satellite altimeters, namely: 1) Jason-1 and 2) ENVISAT. At these nodes, we obtain TRMM clear-air normalized radar cross-section data along with coincident altimeter-derived significant wave height. Wind speed estimates come from the European Centre for Medium-Range Weather Forecast. TRMM PR is the first satellite to measure low incidence Ku-band ocean backscatter at a continuum of incidence angles from 0 degrees to 18 degrees. This letter utilizes these global ocean data to assess hypotheses developed in past theoretical and field studies. Y1 - 2007/10 PB - IEEE Geoscience and Remote Sensing Society JF - IEEE Geoscience and Remote Sensing Letters SN - 1545-598X VL - 4 IS - 4 SP - 542 EP - 546 ID - 3299 ER -