An Experiment of Precise Gravity Measurements on Ice Sheet, Antarctica
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
Unable to display preview. Download preview PDF.
- Amalvict, M., Mäkinen, J., Shibuya, K. and Fukuda Y. (2005): Absolute Gravimetry in Antarctica: Status and Prospects, submitted to J. Geodynamics.Google Scholar
- Fukuda, Y., Aoki, S. and Doi, K. (2002): Impact of satellite gravity missions on Glaciology and Antarctic Earth sciences, Polar Meteorol. Glaciol., 16, 32–41.Google Scholar
- Fukuda, Y., Shibuya, K., Doi, K. and Aoki, S. (2003): A Challenge to the Detection of Regional to Local Scale Ice Sheet Movements in Antarctica by the Combination of In-situ Gravity Measurements and Gravity Satellite Data, 3rd Meeting of the International Gravity and Geoid Commission (IGGC), Tziavos (ed.), GG2002, 243–248.Google Scholar
- Fukuda, Y., Higashi, T., Takemoto, S., Iwano, S., Doi, K., Shibuya, K., Hiraoka, Y., Kimura, I., McQeen, H., Govind, R. (2004) Absolute Gravity Measurements in Australia and Syowa Station, Antarctica, IAG, International Symposium, Gravity, Geoid and Space Mission GGSM2004, C. Jekili, L. Bastos, J. Fernandes (Eds.), IAG Symposia, 129, Springer, 280–285.Google Scholar
- National Institute of Polar Research (1989): Antarctica: East Queen Maud Land Enderby Land Glaciological Folio, 8 sheets and explanatory text, National Institute of Polar Research, Tokyo, Japan (ISBN 4-906651-00-3 Folio).Google Scholar
- Shibuya, K., Doi, K. and Aoki, S. (2003): Ten years’ progress of Syowa Station, Antarctica, as a global geodesy network site, Polar Geoscience, 16, 29–52.Google Scholar
- Shum, C.K., Jekeli, C., Keynon, S. and Roman, D. (2001): Validation of GOCE and GOCE/GRACE Data Products, Prelaunch Support and Science Studies, presented at the International GOCE User Workshop, April 23–24th, 2001, ESTEC, Noordwijk, NL, 1–5.Google Scholar