Centre de documentation
scientifique

Potential use of surface-sensitive microwave observations over land in numerical weather prediction / E. Gerard in IEEE Transactions on geoscience and remote sensing, vol 49 n° 4 (April 2011)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 49 n° 4 (April 2011) . - pp 1251 - 1262 Titre : Potential use of surface-sensitive microwave observations over land in numerical weather prediction Type de document : Article/Communication Auteurs : E. Gerard, Auteur ; Fatima Karbou, Auteur ; Florence Rabier, Auteur Année de publication : 2011 Article en page(s) : pp 1251 - 1262 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] assimilation des données [Termes IGN] intégration de données [Termes IGN] prévision météorologique [Termes IGN] Special sensor microwave imager [Termes IGN] télédétection en hyperfréquence Résumé : (Auteur) This paper describes several sensitivity studies carried out with the French global 4-D-Var system to check its ability to assimilate surface-sensitive observations over land from the Special Sensor Microwave Imager (SSM/I). As well as a sound knowledge of land-surface parameters, the assimilation of SSM/I observations requires effective rain-detection and bias-correction algorithms. Three sensitivity components are hence analyzed with a special emphasis on the land-surface emissivity at SSM/I frequencies estimated from satellite observations. Several rain algorithms were tested to reject cloudy/rainy observations over land, and the bias-correction scheme was adapted to improve its performance over land and sea surfaces. Once these problems have been outlined, a global 4-D-Var assimilation experiment which assimilates SSM/I observations over land surfaces was run and compared with a control experiment. The impact on forecast scores has been found to be globally positive. Nevertheless, the very high sensitivity of SSM/I to each of the three components presented in this study is characterized by opposite effects that, once clustered together, lead to some residual biases over land due to their combined effects. Numéro de notice : A2011-132 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2010.2075936 Date de publication en ligne : 21/10/2010 En ligne : https://doi.org/10.1109/TGRS.2010.2075936 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30911 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-2011041	RAB	Revue	Centre de documentation	En réserve L003	Disponible