Onto a Skewness Approach to the Generalized Curvature Ocean Surface Scattering Model
Type | Article | ||||||||||||
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Date | 2017-10 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Said Faozi1, Johnsen Harald2, Nouguier Frederic3, Chapron Bertrand3, Engen Geir2 | ||||||||||||
Affiliation(s) | 1 : NOAA, Ctr Satellite Applicat & Res, College Pk, MD 20740 USA. 2 : Norut, Earth Observat Dept, N-9294 Tromso, Norway. 3 : IFREMER, Lab Oceanog Spatiale, F-29280 Plouzane, France. |
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Source | Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Ieee-inst Electrical Electronics Engineers Inc), 2017-10 , Vol. 55 , N. 10 , P. 5843-5853 | ||||||||||||
DOI | 10.1109/TGRS.2017.2715986 | ||||||||||||
Keyword(s) | Geophysical measurements, radar cross section, remote sensing, sea surface, surface waves | ||||||||||||
Abstract | The generalized curvature ocean surface scattering model [general curvature model (GCM)] is extended and revisited. Two key steps are addressed in this paper, namely, a necessary sea surface spectrum undressing procedure and the inclusion of a skewness phase-related component. Normalized radar cross-section (NRCS) simulations are generated at C-band for various wind conditions, polarizations, and incidence angles. Results are compared with CMOD5.n. Although the sea surface spectrum undressing procedure is a necessary step, the overall NRCS dynamic is notably affected only in low wind conditions (<= 5 m/s). The inclusion of the skewness phase-related component makes the most impact to the NRCS dynamic where the upwind/downwind asymmetry is clearly detectable. A good agreement between the upwind/downwind asymmetry of the extended GCM and CMOD5.n is achieved for moderate winds (approximate to 5-10 m/s) and moderate incidence angles (approximate to 32 degrees -40 degrees). For low incidence angles (<26 degrees), the GCM tends to overestimate the upwind/downwind asymmetry compared with CMOD5.n. |
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