Accession Number : ADP007294

Title :   The Surface Condition on the Antarctic Ice Sheet,

Corporate Author : NAGOYA UNIV (JAPAN)

Personal Author(s) : Seko, Katsumoto ; Furukawa, Teruo ; Watanabe, Okitsugu

Report Date : MAR 1992

Pagination or Media Count : 5

Abstract : NOAA AVHRR data reveal clear images of meso-scale (spatial scale on the order of tens of kilometers) undulating topography, surface properties and katabatic wind field on the Antarctic ice sheet. Katabatic wind is visualized as fluctuations of brightness temperature which align parallel to the wind direction. The temperature fluctuation is probably caused by the fluctuation of wind velocity. Two typical patterns of undulations on the ice sheet were detected. One of them appears on the slope region where katabatic wind prevails. The band-shaped undulations develop normal to the prevailing wind with a spacing of a few tens of kilometers and an amplitude of a few tens of meters. A few percent of albedo change associated with the variation of accumulation co-exists with the undulation. The eolian process can be considered a dominant force in making this pattern. Another undulating pattern can be seen further inland on the plateau. This undulation has a different orientation with an approximate spacing of 50 km and an amplitude of a few tens of meters.

Descriptors :   *SURFACE PROPERTIES, *PACK ICE, *DATA ACQUISITION, ACCUMULATION, ALBEDO, AMPLITUDE, IMAGES, PATTERNS, PLATEAUS, SLOPE, TEMPERATURE, TOPOGRAPHY, VARIATIONS, VELOCITY, WIND DIRECTION, WIND VELOCITY, ANTARCTIC REGIONS.

Subject Categories : Meteorology
      Information Science
      Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE