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Effects of atmospheric stability and wind fetch on microwave sea echoes / Yunhua Wang in IEEE Transactions on geoscience and remote sensing, vol 52 n° 2 (February 2014)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 52 n° 2 (February 2014) . - pp 929 - 935 Titre : Effects of atmospheric stability and wind fetch on microwave sea echoes Type de document : Article/Communication Auteurs : Yunhua Wang, Auteur ; Yanmin Zhang, Auteur ; Haihu Chen, Auteur ; Lixin Guo, Auteur Année de publication : 2014 Article en page(s) : pp 929 - 935 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] écho radar [Termes IGN] stabilité [Termes IGN] surface de la mer [Termes IGN] vent Résumé : (Auteur) The influences of atmospheric stability and wind fetch on microwave scattering from sea surfaces are presented. The equivalent neutral wind speed (ENWS) and the friction velocity (FV) above sea surface are evaluated by the similarity theory of Monin and Obukhov in combination with the Charnock relation. The numerical simulations show that atmospheric stability and wind fetch would make effects on ENWS and, therefore, further on the scattering coefficients (NRCS). And the NRCS decreases with increasing air-sea temperature difference (ÄT=Ta-Ts) because the ENWS is lower than actual wind speed in stable atmospheric condition, and vice versa. Moreover, the ENWS/FV and the NRCS decrease with increasing wind fetch under unstable atmospheric condition. However, in stable atmospheres, the ENWS/FV and the NRCS are almost insensitive to wind fetch. In this paper, the response of NRCS to ÄT is also discussed. Compared with FV, the variations of the angle spread function with ÄT can be neglected because of its minor contribution. Numéro de notice : A2014-071 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2245673 En ligne : https://doi.org/10.1109/TGRS.2013.2245673 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32976 [article]

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