日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 S (固体地球科学) » S-GD 測地学

[S-GD01] 重力・ジオイド

2019年5月28日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:兒玉 篤郎(国土交通省国土地理院)、岡 大輔(地方独立行政法人北海道立総合研究機構環境・地質研究本部地質研究所)

[SGD01-P01] An Improved GRACE time-varying gravity field model and its application in China and Antarctica

*Yunlong Wu1Yi Zhang1Zhengbo Zou1Minzhang Hu1 (1.Institute of Seismology, China Earthquake Administration)

キーワード:GRACE, Time-varying gravity field, Combined model, Forward modeling, Equivalent water height

A cross correlation analysis is carried out on the time-varying gravity field models derived from GRACE observations and provided by CSR, GFZ, JPL and ITSG. This is used to propose an improved weight determination method for producing a combined time-varying gravity field model. Taking the Antarctic region as a test area, the reliability and accuracy of the combined model is verified by comparing the changes of Antarctic ice sheet mass inferred from it and the other gravity field solutions considered. The results show that the minimum difference in mass changes (expressed as equivalent water height) between the combined model and the ITSG inversion is concentrated between -0.2 cm to 0.4 cm. To further verify the new method, China’s Three Gorges region, the North China Plain region, and the Tianshan region are assessed. The results indicate that the new combined time-varying gravity field model is consistent with those models published by CSR, GFZ and JPL, and conforms best to ITSG. The combined time-varying gravity field model proposed in this paper provides a reference for the application of such models and the optimization of time-varying gravity field for future gravity satellite missions.