Effect of long waves on Ku-band ocean radar backscatter at low incidence angles using TRMM and altimeter data

Type Article
Date 2007-10
Language English
Author(s) Tran Ngan1, Chapron Bertrand2, Vandemark D3
Affiliation(s) 1 : Collecte Localisat Satellites, Space Oceanog Div, F-31520 St Agne, France.
2 : IFREMER, Ctr Brest, F-29280 Plouzane, France.
3 : Univ New Hampshire, Ocean Proc Analy Lab, Durham, NH 03824 USA.
Source IEEE Geoscience and Remote Sensing Letters (1545-598X) (IEEE Geoscience and Remote Sensing Society), 2007-10 , Vol. 4 , N. 4 , P. 542-546
DOI 10.1109/LGRS.2007.896329
WOS© Times Cited 47
Keyword(s) Space borne radar, Scattering, Radar cross section, Altimetry
Abstract 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.
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