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Studies on global gravity changes by means of absolute gravity measurements at the GGP-JAPAN superconducting gravity stations.

通过GGP-JAPAN超导重力站的绝对重力测量研究全球重力变化。

基本信息

批准号：
14340132
负责人：
FUKUDA Yoichi
金额：
$ 10.62万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340132/
关键词：
Absolute Gravimeter Superconducting Gravimeter GGP Gravity Changes Satellite Gravimetry Gravity Base Station

项目摘要

The goal of this study is to determine calibration factors of superconducting gravimeters of the GGP(Global Geodynamic project)-Japan stations, and to obtain precise gravity data sets, which can be used for the comparison with the satellite gravity data such as GRACE, by means of absolute gravity measurements.For this purpose, we conducted absolute gravity measurements by our own hand at the GGP-Japan sites of Bandung (Indonesia) in 2002, Syowa Station (Antarctica) in 2003 and Canberra (Australia) in 2004, in addition to the GGP-Japan domestic sites of Kyoto, Esashi and Matsushiro. Absolute gravity measurements at Ny-Alesund, the other GGP-Japan site in Arctic area, were also conducted in cooperation with European researchers. Moreover, we conducted additional absolute measurements in Yogyakarta and Tibinon (Indonesia), and in Perth (Australia) for future references of secular gravity changes.As the results of this study, besides the originally intended outcome, namely the determination of the calibration factors of the superconducting gravimeters at the GGP-Japan sites, we established several absolute gravity stations for detecting future gravity changes. Especially the absolute gravity measurement conducted by this research was the first one in the history of Indonesia, and it also played a big role to enhance the gravity reference network in Indonesia.On the other hand, from the viewpoint of the secular gravity changes, we detected the gravity change expected from the postglacial rebound in Syowa Station, and we also succeeded in detecting the gravity change associated with present day ice melting in Ny-Alesund.

为了确定GGP(全球地球动力学计划)-日本站的超导重力仪的定标因子，并通过绝对重力测量获得可用于与GRACE等卫星重力数据对比的精确重力数据集。为此，我们于2002年在GGP-日本站点万隆(印度尼西亚)、2003年Syowa站(南极洲)和堪培拉(2004年)以及GGP-日本国内站点京都、Esashi和Matsushiro进行了绝对重力测量。还与欧洲研究人员合作，在北极地区的另一个GGP-日本站点NY-Alesund进行了绝对重力测量。此外，我们还在印度尼西亚的日惹和提比农以及澳大利亚的珀斯进行了额外的绝对测量，作为未来长期重力变化的参考。作为这项研究的结果，除了最初预期的结果，即确定GGP-日本站点的超导重力仪的校准因子外，我们还建立了几个绝对重力站来探测未来的重力变化。特别是本研究进行的绝对重力测量是印尼历史上的第一次，也对印尼重力参考网的完善起到了很大的作用。另一方面，从长期重力变化的角度，我们探测到了西奥瓦站冰后反弹预期的重力变化，也成功地探测到了与NY-Alesund冰川融化相关的重力变化。