DocumentCode :
2137837
Title :
Comparison of AMSR-E and SSM/I snow parameter retrievals over the Ob river basin
Author :
Mognard, N.M. ; Grippa, M. ; LeToan, T. ; Kelly, R.E.J. ; Chang, A.T.C. ; Josberger, E.G.
Author_Institution :
Lab. d´´Etudes en Geophysique et Oceanographie Spatiale, LEGOS-CNES-OMP, Toulouse, France
Volume :
6
fYear :
2004
fDate :
20-24 Sept. 2004
Abstract :
Summary only given. Passive microwave observations from the Advanced Microwave Scanning Radiometer-EOS (AMSR-E) and from the Special Sensor Microwave Imager (SSM/I) are used to analyse the evolution of the snow pack in the Ob river basin during the snow season of 2002-03. The Ob river is the biggest Russian river with respect to its watershed area (2975000 km2). The Ob originates in the Altai mountains and flows northward across the vast West Siberian lowland towards the Arctic Ocean. The majority of snow cover is contained in the lowlands rather than in mountainous regions and persists for six months or more. During the snow season, surface air temperatures are very cold. Therefore, the combination of cold dry snow and large areas of uniform topography is ideal for snowpack extent and water equivalent retrievals from passive microwave observations. The thermal gradient through the snow pack is estimated and used to model the growth of the snow grain size and to compute the evolution of the passive microwave derived snow depth over the region. A comparison between the AMSR-E and SSM/I estimates is performed and the differences between the snow parameters from the two satellite instruments are analysed.
Keywords :
hydrological techniques; microwave measurement; radiometry; rivers; snow; terrain mapping; AD 2002 to 2003; AMSR-E; Advanced Microwave Scanning Radiometer-EOS; Altai mountains; Arctic Ocean; Ob river basin; Russia; Russian river; SSM/I; Special Sensor Microwave Imager; West Siberian lowland; cold dry snow; passive microwave observations; remote sensing; satellite instruments; snow cover; snow extent; snow grain size growth modeling; snow pack evolution; snow parameter retrievals; snow season; snow water equivalent; snowpack extent; surface air temperatures; thermal gradient estimation; topography; water equivalent retrievals; watershed area; Arctic; Image analysis; Image sensors; Microwave radiometry; Microwave sensors; Ocean temperature; Rivers; Sea surface; Snow; Surface topography;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International
Print_ISBN :
0-7803-8742-2
Type :
conf
DOI :
10.1109/IGARSS.2004.1369927
Filename :
1369927
Link To Document :
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