Microwave Emission from Polar Surfaces I.
Final rept. Oct 88-Mar 96,
WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES
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The goal of the work performed on this grant was to investigate the passive microwave signatures of arctic sea ice concentrating on new, young, and mature first-year ice types to determine the extent to which passive microwave remote sensing of the polar regions can be used to determine sea ice concentration and ice type. A series of surface based observational studies was carried out in the Arctic and at the Cold Regions Research and Engineering Laboratory in Hanover NH. These studies involved the acquisition of microwave and infrared brightness temperatures and emissivities of sea ice during various stages of development, in particular those of importance for the energy balance of the polar regions. We determined that it is possible to distinguish between growing congelation ice laminar growth and frazil pancake ice growth in a wave field. The following categories have distinct microwave signatures identifiable under favorable conditions from satellite-open water, new congelation ice, frazil ice, young congelation ice, pancake ice, and first-year ice. Concurrent theoretical modeling to relate the ice emissivities to the physical properties of the ice was successful in reproducing the signature development of these ice types consistent with the measured physical properties.
- Snow, Ice and Permafrost
- Atomic and Molecular Physics and Spectroscopy