氷河・氷床のリモートセンシング

抄録

Glaciological investigations by radio echo sounding and satellite remote sensing technique have been carried out in the area of glaciers, Greenland and Antarctic ice sheets.
Airborne radio echo sounder is a sophisticated instrument to measure ice thickness of glacier and ice sheet in the polar region. The radio echo sounder newly designed at 179 MHz indicated that the maximum ice thickness observed was about 2, 800 m in depth and the Z-scope data showed the fine multiple internal layers in the ice sheet. In addition, an estimation methods were proposed for radio scattering characteristics of the bottom of ice sheet along Shirase glacier with the subglacial water and also proposed for the accurate location of the grounding line in Roi Baudouin Ice Shelf.
To gain the perspective that includes the dynamic features of the ice sheet, it is neccessary to view the ice sheet from rpace with enhanced digtal imagery. Many of the most significant dynamic features of ice sheets can be identified by a careful examination of AVHRR imagery. The relatively low resolution of this instrument makes it ideal for obtaining a broad view of the ice sheets, while its wide swath allows coverage of areas beyond the reach of highresolution imagers either currently in planned orbit.