Determination of the precise gravity fields around the Japanese Antarctic station, Syowa, using GOCE satellite gravity data

2014 Fiscal Year Final Research Report

• Project/Area Number: 23540494
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kyoto University
• Principal Investigator: FUKUDA Yoichi 京都大学, 理学(系)研究科(研究院), 教授 (30133854)
• Co-Investigator(Kenkyū-buntansha): NOGI Yoshifumi 国立極地研究所, 研究教育系, 教授 (90280536)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: GOCE / 衛星重力 / 航空重力 / 重力異常 / 重力ジオイド / 南極昭和基地 / 重力偏差計 / LSC法

Outline of Final Research Achievements

Using the in-situ gravity data obtained by JARE (the Japanese Antarctic Research Expedition) and GOCE (Gravity field and steady-state Ocean Circulation Explorer) EGMs (Earth Gravity Models), the precise gravity fields around the Japanese Antarctic station, Syowa, have been newly determined. The in-situ data sets employed were the land gravity data since 1967, the surface ship data since 1985 and the airborne gravity data in 2006. Combining these data sets by means of LSC (Least Squares Collocation), the gravity anomalies and the geoid heights have been estimated with the formal errors of a few mGals and a few cm, respectively. A locally determined geoid height at the GPS point in Syowa was compared with the obtained geoid to estimate the sea surface dynamic height. Moreover, GOCE EGMs were evaluated using the airborne gravity data, and the importance of reliable in-situ data has been demonstrated for the purposes.

Free Research Field

測地学