K-Band Radiometric Mapping of Sea Ice.

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...

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Bibliographic Details
Main Authors: Ketchum,R D , Jr, Farmer,L D, Welsh,J P , Jr
Other Authors: NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS
Format: Text
Language:English
Published: 1983
Subjects:
Snow
Ice and Permafrost
*RADIOMETRY
*SEA ICE
AERIAL RECONNAISSANCE
THICKNESS
FRACTURE(MECHANICS)
MAPPING
MOISTURE
ARCTIC OCEAN
K BAND
*KRMS(Ka Band Radiometric Mapping System)
Brightness temperature
PE61153N
Arctic
Arctic Ocean
Arctic Basin
Canadian Archipelago
Chukchi
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA128205
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA128205
Description
Summary: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 snow/ice 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.

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