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Microwave radiometric observations of snowpacksModels for the microwave emission from snowpacks were generated on the basis of radiometric observations made at 10.7 GHz, 37 HGz, and 94 GHz at a test site near Steamboat Springs, Colorado. In addition to conducting measurements on an approximately daily basis over a six week observation period, measurements were made over several diurnal cycles during which the change in snow wetness was tracked by the microwave radiometers. Also, the variation in emissivity with snow water equivalent was examined, as was the sensitivity to changes in snow surface geometry. The microwave emissivity was observed to (1) decrease exponentially with snow water equivalent and (2) increase with snow wetness. Thus, the emission behavior is the reverse of the backscattering behavior observed by the radar. By fitting the models to the measured data, the variation of the optical depth with snow wetness was estimated.
Document ID
19810010995
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ulaby, F. T.
(Kansas Univ. Center for Research, Inc. Lawrence, KS, United States)
Stiles, W. H.
(Kansas Univ. Center for Research, Inc. Lawrence, KS, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Publication Information
Publication: NASA. Goddard Space Flight Center Microwave Remote Sensing of Snowpack Properties
Subject Category
Earth Resources And Remote Sensing
Accession Number
81N19522
Funding Number(s)
CONTRACT_GRANT: NAS5-23777
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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