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Airborne retrievals of snow and ice surface emissivity at millimeter wavelengths

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2 Author(s)
T. J. Hewison ; DERA, Meteorol. Office, Farnborough, UK ; S. J. English

Passive microwave radiometers (24-157 GHz) have been flown over Baltic Sea ice and snow sites in April 1995 and on March 15, 1997. Data from these instruments are analyzed with reference to ground measurements of snow and ice conditions, and emissivity spectra are presented for 12 classifications of surface type. A simple model based on dielectric permittivity can accurately represent the microwave spectra of sea ice, but cannot be extended to the behavior of dry snow above 100 GHz without the addition of an extra term to represent volume scattering. The parameterization presented is intended to provide a background for temperature and humidity retrievals from satellite sounders, but the results will be of interest to the snow and ice remote-sensing communities

Published in:

IEEE Transactions on Geoscience and Remote Sensing  (Volume:37 ,  Issue: 4 )