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United States Department of Agriculture

Agricultural Research Service

Research Project: USING REMOTE SENSING & MODELING FOR EVALUATING HYDROLOGIC FLUXES, STATES, & CONSTITUENT TRANSPORT PROCESSES WITHIN AGRICULTURAL LANDSCAPES Title: Analysis of WindSat Data over Arctic Sea Ice

Authors
item Narvekar, P - UNIVERSITY BREMEN
item Heygster, G - UNIVERSITY BREMEN
item Tonboe, R - DANISH MET INSTITUTE
item Jackson, Thomas

Submitted to: International Geoscience and Remote Sensing Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: July 4, 2008
Publication Date: December 22, 2008
Citation: Narvekar, P.S., Heygster, G., Tonboe, R., Jackson, T.J. 2008. Analysis of WindSat data over Arctic Sea ice. In: Proceedings of the International Geoscience and Remote Sensing Symposium, July 7-11, 2008, Boston, Massachusetts. p. V369-V372.

Technical Abstract: The radiation of the 3rd and 4th Stokes components emitted by Arctic sea ice and observed by the spaceborne fully polarimetric radiometer WindSat is investigated. Two types of analysis are carried out, spatial (maps of different quadrants of azimuth look angles) and temporal (time series of daily averages over small selected ranges of azimuth angles). The 3rd Stokes component at 37 GHz has shown the highest signal during early summer (>2 K). The next highest signals were observed at the 10.7 GHz 3rd and 4th Stokes components during the summer months (>1 K). The 37 GHz 4th Stokes component has shown the least variability (<1 K). The 10.7 GHz 4th Stokes component has higher signal at the ice edge, confirmed from the sea ice concentration maps derived from Advanced Microwave Scanning Radiometer (AMSR-E) data, and similar to signals observed over global coastlines. From the comparison with near surface air temperature of the European Center for Medium-Range Weather Forecasts (ECMWF) model data and Scanning Multichannel Microwave/ Imager (SSM/I) NASA Team ice concentrations it was concluded that the microphysical processes during early melting in the topmost sea ice layers are responsible for the high 37 GHz 3rd Stokes signal.

Last Modified: 8/22/2014
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