Accession Number:

ADA128205

Title:

K-Band Radiometric Mapping of Sea Ice

Descriptive Note:

Final rept.

Corporate Author:

NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY STENNIS SPACE CENTER MS

Report Date:

1983-01-01

Pagination or Media Count:

23.0

Abstract:

The Ka-band radiometric mapping system KRMS, an airborne 33.6 GHz passive microwave imager, was flown over sea ice in the Bering, Chukchi and Beaufort Seas and in the Canadian Archipelago. The data discussed was obtained on 14 and 16 May 1982. The system, as flown, measures the relative brightness temperature T sub B of the objects radiating toward the rotating antennae. Differences in T sub B appear to be related to variation in ice thickness, surface moisture, deformation processes and melting and refreezing processes. A snowice interface development is hypothesized to relate to decreasing T sub B as ice increases in age. The T sub B of undisturbed new ice is warmer than open water. The T sub B of first-year ice appears to decrease with increasing age and seems to be less variable than the thinner ice types. Multi-year ice appears colder than first-year ice but warmer than open water. Two different categories of multi-year ice floes were observed. Arctic basin multi-year floes were distinguished by the rounded shapes, colder T sub B and irregular distribution of frozen melt ponds warmer T sub B. Archipelago multi-year floes were less rounded, had warmer T sub B and displayed a more regular homogeneous distribution of frozen melt ponds. Both categories of multi-year floes were radiometrically colder than the warmer higher T sub B first-year ice types surrounding them and thus were readily identified.

Subject Categories:

  • Snow, Ice and Permafrost

Distribution Statement:

APPROVED FOR PUBLIC RELEASE