Mathematics – Logic
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...33j&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 1, p. 33-36
Mathematics
Logic
26
Glaciers, Glaciology, Greenland, Melting, Radar Measurement, Snow, Stratigraphy, Backscattering, Microwave Signatures, Remote Sensing, Summer, Surface Temperature
Scientific paper
Surface-based microwave radar measurements were performed at a location on the western flank of the Greenland Ice Sheet. Here, firn metamorphasis is dominated by seasonal melt, which leads to marked contrasts in the vertical structure of winter and summer firn. This snow regime is also one of the brightest radar targets on Earth with an average backscatter coefficient of 0 dB at 5.3 GHz and an incidence angle of 25 deg. By combining detailed observations of firn physical properties with ranging radar measurements we find that the glaciological mechanism associated with this strong electromagnetic response is summer ice lens formation within the previous winter's snow pack. This observation has important implications for monitoring and understanding changes in ice sheet volume using spaceborne microwave sensors.
Gogineni Prasad
Jezek Kenneth C.
Shanableh M.
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