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Scatterometer azimuthal response and wind wave directionalityAzimuthal response of a scatterometer to radiation scattered by the sea surface was studied in a wind-wave tank. The variation of the normalized radar cross section with the azimuth angle is fitted by a three-term series. Results show that the upwind-downwind asymmetry decreases as the wind speed increases. The crosswind modulation depends on the wind velocity. The results show that the evolution of the long-wind-crosswind ratio evolves with wind speed in a manner similar to the evolution of the isotropy of short capillary-gravity waves. The maximum of the isotropy of the short wind waves is obtained for wind velocities close to 4 m/s. For the same value of the velocity, the variations of radar response between long-wind and crosswind directions is minimum. For lower or higher values of wind velocities the directional accuracy of the radar increases, since the wind-wave field tends to align in the wind direction.
Document ID
19910031144
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Giovanangeli, J. P.
(Aix-Marseilles Univ. France)
Le Calve, O.
(Institut de Mecanique Statistique de la Turbulence Marseille, France)
Bliven, L.
(NASA Wallops Flight Center Wallops Island, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
Meteorology And Climatology
Accession Number
91A15767
Distribution Limits
Public
Copyright
Other

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