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Home WindSat Passive Microwave Polarimetric Signatures of the Greenland Ice Sheet

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WindSat Passive Microwave Polarimetric Signatures of the Greenland Ice Sheet

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Permanent URL	http://hdl.lib.byu.edu/1877/1137
Title	WindSat Passive Microwave Polarimetric Signatures of the Greenland Ice Sheet
BYU Creator	Long, David G.
Creator	Li, Li Gaiser, Peter Albert, Mary R. Twarog, Elizabeth M.
Keywords	Greenland ice sheet; WindSat; ice; water; polarimetric microwave radiometry; snow;
Description/Abstract	WindSat has systematically collected the first global fully polarimetric passive microwave data over both land and ocean. As the first spaceborne polarimetric microwave radiometer, it was designed to measure ocean surface wind speed and direction by including the third and fourth Stokes parameters, which are mostly related to the asymmetric structures of the ocean surface roughness. Although designed for wind vector retrieval, WindSat data are also collected over land and ice, and this new data has revealed, for the first time, significant land signals in the third and fourth Stokes parameter channels, particularly over Greenland and the Antarctic ice sheets. The third and fourth Stokes parameters show well-defined large azimuth modulations that appear to be correlated with geophysical variations, particularly snow structure, melting, and metamorphism, and have distinct seasonal variation. The polarimetric signatures are relatively weak in the summer and are strongest around spring. This corresponds well with the formation and erosion of the sastrugi in the dry snow zone and snowmelt in the soaked zone. In this paper, we present the full polarimetric signatures obtained from WindSat over Greenland, and use a simple empirical observation model to quantify the azimuthal variations of the signatures in space and time.
Source	Li, L., et al. "WindSat Passive Microwave Polarimetric Signatures of the Greenland Ice Sheet." Geoscience and Remote Sensing, IEEE Transactions on 46.9 (2008): 2622-31;
Publisher	IEEE
Date Original	2008-09
Language	English eng en
Publication Type	Peer-Reviewed Articles
Type	Text
Format	application/pdf
Owning Institution	Brigham Young University
BYU College	Ira A. Fulton College of Engineering and Technology
BYU Department	Electrical and Computer Engineering
Copyright Status	(c) 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.;
Copyright Use Information	http://www.lib.byu.edu/generic_copyright.html

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