An Experiment of Precise Gravity Measurements on Ice Sheet, Antarctica
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Aiming at the future applications of the precise gravity measurements for glaciological studies and the CAL/VAL (Calibration/ Validation) purpose of satellite gravity mission data, we conducted several experiments of precise gravity measurements on ice sheet near Syowa Station, Antarctica, during the 45th Japanese Antarctic Research Expedition (JARE-45). We established a test site where a set of 5 by 5 gravity points with a 10-m interval and the other set of 4 by 4 points between the 5 by 5 points are installed, and conducted gravity measurements as well as RTK (Real Time Kinematic) GPS surveys on the gravity points. Since the positions of the gravity points are moving due to the ice sheet flow with the speed of about 5 m/yr at the site, we simulated the gravity measurements on the moving ice sheet by evaluating how well the gravity values of the second set (4 by 4 points) could be estimated from the gravity values of the first sets (5 by 5 points). The result suggests that the measurements with an appropriate data processing enable 10 μGal accuracy even on the moving ice sheet.
KeywordsTemporal gravity changes Ice sheet Antarctica Precise gravity measurements Absolute gravity measurement Kinematic GPS
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