CHARACTERISTICS OF RADIO ATTENUATION COEFFICIENT ON THE SØR RONDARNE ICE SHEET, ANTARCTICA

• Main Authors: マエノ ヒデオ, ウラツカ セイホ, Hideo MAENO, Seiho URATSUKA
• Format: Report
• Language: English
• Published: ABSTRACT 1997
• Subjects: Sør Rondane Mountains; Sør-Rondane; Antarc*; Antarctica; Ice Sheet; Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3997; http://id.nii.ac.jp/1291/00003997/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3997&item_no=1&attribute_id=18&file_no=1

The depth-averaged attenuation coefficients are calculated from the echo pattern measurements from internal ice. The attenuation coefficients around the Sør Rondane Mountains, Antarctica were mapped from the 179MHz airborne radio-echo sounder, which made observations during 1986. The map shows a tendency of decreasing attenuation as the surface altitude of the ice sheet increases. This result is interpreted by using the relationship between attenuation coefficients and ice temperature. In addition, a cosine relationship was found between attenuation coefficients and the angle of the radar polarization from the topographic contour. The dynamic range of the variety of the attenuation coefficients is 1.2dB/100m. If the ice flow is perpendicular to the topographic contour, the ice flow direction will be derived from the polarimetric radar observation.