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Proceedings Paper

Azimuthal variations in polarimetric microwave measurements observed over Dome C, Antarctica
Author(s): Parag S. Narvekar; Georg Heygster; Thomas J. Jackson; Rajat Bindlish; Li Li
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Paper Abstract

WindSat is the first spaceborne fully polarimetric radiometer. It measures all four Stokes components; Tv (vertically polarized), Th (horizontally), U (difference between polarizations at +45° and -45°) and V (difference right hand minus left hand circular polarized) and is primarily developed to retrieve wind speed and direction over ocean. Here we investigate the WindSat observations over Dome C, Antarctica, consisting of nearly flat terrain at about 3200 m above sea level. The seasonal cycles of Tv and Th reflect the surface temperature cycle and the penetration depth decreasing with increasing frequency (6 to 37 GHz), while the difference Tv - Th is nearly constant. The U and V signals are most pronounced in Austral winter (July-August). The differences between ascending and descending overpasses, corresponding to different azimuth observing directions, take values up to 1.2 K (U) and 3 K (V). Fitting the data of for and aft swath to a second order harmonic function of the azimuth angle reveals a consistent orientation of the structures at the used frequencies 10 and 37 GHz and Stokes components U and V in the direction of about 153° with respect to north, consistent with the small overall slope direction of the terrain (145°) and ERS scatterometer observations.

Paper Details

Date Published: 8 December 2006
PDF: 10 pages
Proc. SPIE 6410, Microwave Remote Sensing of the Atmosphere and Environment V, 64100J (8 December 2006); doi: 10.1117/12.693503
Show Author Affiliations
Parag S. Narvekar, Bremen Univ. (Germany)
Georg Heygster, Bremen Univ. (Germany)
Thomas J. Jackson, USDA (United States)
Rajat Bindlish, USDA (United States)
Li Li, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 6410:
Microwave Remote Sensing of the Atmosphere and Environment V
Azita Valinia; Seiho Uratsuka; Tapan Misra, Editor(s)

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