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Onto a Skewness Approach to the Generalized Curvature Ocean Surface Scattering Model ArchiMer
Said, Faozi; Johnsen, Harald; Nouguier, Frederic; Chapron, Bertrand; Engen, Geir.
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...
Tipo: Text Palavras-chave: Geophysical measurements; Radar cross section; Remote sensing; Sea surface; Surface waves.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00409/52013/52725.pdf
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Geophysical Model Function for the AMSR2 C-Band Wind Excess Emissivity at High Winds ArchiMer
Zabolotskikh, Elizaveta V.; Reul, Nicolas; Chapron, Bertrand.
Measurements of the Advanced Microwave Scanning Radiometer 2 (AMSR2) onboard GCOM-W1 satellite at 6.925 and 7.3 GHz and both linear polarizations over tropical cyclones (TCs) during 2012 – 2014 are used to derive a new geophysical function relating the brightness temperature to the sea surface wind speed (SWS) in extreme conditions. . Similar sensitivity to SWS at close C-band frequencies allowed to correct for the atmospheric contributions to the microwave radiance and estimate the brightness temperature (TB) at the surface under the TCs, combining theoretical modeling and measured TB analyses. Estimated oceanic TBs were regressed against the wind speeds from the Best Track Archive to derive the new geophysical model function (GMF) for the wind speed...
Tipo: Text Palavras-chave: Atmosphere; Geophysical measurements; Oceans; Passive microwave remote sensing; Tropical cyclones (TCs).
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00300/41094/40267.pdf
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