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	Provedor de dados ArchiMer (3) Autor Chapron, Bertrand (3) Chen, G (1) Ezraty, Robert (1) Mitnik, Leonid (1) Reul, Nicolas (1) Vandemark, D (1) Zabolotskikh, E.v. (1) Zabolotskikh, Elizaveta (1) Mais... Palavra-chave Sea surface wind speed (3) AMSR2 (2) Altimeter (1) Arctic (1) Brightness temperature modeling (1) Brightness temperatures (1) Dual frequency (1) Geophysical model functions (1) Hurricanes (1) Microwave radiation (1) Physical modeling (1) Rain rate (1) Retrieval (1) Satellite microwave radiometers (1) Satellite passive microwave (1) TOPEX (1) Mais... Tipo do documento Text (3) Ano 2019 (1) 2015 (1) 2002 (1) País France (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última A dual-frequency approach for retrieving sea surface wind speed from TOPEX altimetry ArchiMer Chen, G; Chapron, Bertrand; Ezraty, Robert; Vandemark, D. More than a dozen of wind speed (U) algorithms have been proposed during the past 2 decades, as a result of a continuing effort to improve altimeter wind measurement. The progress in terms of accuracy, however, is seen to be rather slow. The reported root mean square (RMS) error of prevailing algorithms varies mostly between 1.6 and 2.0 m/s for the dominant wind regime. As far as the TOPEX altimeter is concerned, three measured quantities, namely, the radar cross sections from Ku and C band (sigma(Ku) and sigma(C)), as well as the significant wave height (H-s), have been used in previous algorithm developments, resulting in a variety of single-, dual-, and three-parameter model functions. On the basis of the finding of a banded dependency of the... Tipo: Text Palavras-chave: Sea surface wind speed; Retrieval; TOPEX; Altimeter; Dual frequency. Ano: 2002 URL: https://archimer.ifremer.fr/doc/00000/10224/9579.pdf New Possibilities for Geophysical Parameter Retrievals Opened by GCOM-W1 AMSR2 ArchiMer Zabolotskikh, Elizaveta; Mitnik, Leonid; Reul, Nicolas; Chapron, Bertrand. A new approach to retrieve sea surface wind speed (SWS) in tropical cyclones (TCs) from the Advanced Microwave Scanning Radiometer 2 (AMSR2) data is presented. Analysis of all six AMSR2 C- and X-band channel measurements over TCs is shown to efficiently help to separate the rain contribution. Corrected measurements at 6.9 and 10.65 GHz are then used to retrieve the SWS. Spatial and temporal collocation of AMSR2 and tropical rain measurement mission (TRMM) microwave instrument (TMI) data is then further used to empirically relate TMI rain rate (RR) product to RR estimates from AMSR2 in hurricanes. SWS estimates are validated with measurements from the stepped frequency microwave radiometer (SFMR). As further tested, more than 100 North Atlantic and North... Tipo: Text Palavras-chave: Satellite passive microwave; AMSR2; Rain rate; Sea surface wind speed; Hurricanes; Brightness temperature modeling. Ano: 2015 URL: https://archimer.ifremer.fr/doc/00270/38104/36255.pdf Geophysical model functions for cold water microwave radiation dependency on wind speed in K and Ka range at an incidence angle of 55° ArchiMer Zabolotskikh, E.v.; Chapron, Bertrand. Geophysical model functions (GMFs) of the ocean microwave radiation dependence on wind speed at the frequencies of K and Ka range for an incidence angle of 55° are derived using the measurements of the satellite microwave radiometer Advanced Microwave Scanning Radiometer 2 (AMSR2) over open Arctic ocean at the sea surface temperatures (SST), not exceeding 10 °C. To estimate ocean radiation coefficients, surface microwave radiation was calculated using physical modeling of the ocean – atmosphere system brightness temperature. The simulation results made it possible to estimate surface radiation at 18.7, 23.8 and 36.5 GHz on the vertical and horizontal polarization with known atmospheric parameters, based on the ERA-Interim reanalysis data. These estimates... Tipo: Text Palavras-chave: Microwave radiation; Geophysical model functions; Sea surface wind speed; Arctic; Satellite microwave radiometers; Brightness temperatures; AMSR2; Physical modeling. Ano: 2019 URL: https://archimer.ifremer.fr/doc/00660/77193/78614.pdf Registros recuperados: 3 Primeira ... 1 ... Última

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