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Improved geoid model determination for Japan from GRACE and a regional gravity field model

机译：利用GRACE和区域重力场模型改进了日本的大地水准面模型确定

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摘要

A highly improved gravimetric geoid model for Japan, JGEOID2008, is developed on a 1×1.5 arc-minute grid by combining a GRACE (the Gravity Recovery And Climate Experiment)-based global geopotential model, GGM02C, surface (land and ship-borne) gravity measurements, and an altimetry-derived marine gravity model, KMS2002. In the combination, a semidiscrete two-dimensional wavelet analysis/reconstruction method is employed, selecting the spatial wavelength signals of the highest quality out of the respective data sets. Intercomparison with GPS/leveling geoid undulations shows substantial improvement of JGEOID2008 over the previous model, JGEOID2004, and reveals that the systematic errors at long wavelengths contained in JGEOID2004 have been effectively removed. Deviations of JGEOID2008 from the mean sea surface height at tidal stations on isolated islands were comparable to the differences in the sea surface dynamic heights (SSDH) in the Japan Sea, the Nansei Islands and the Izu Island chain from that in Tokyo Bay. The deviations show good agreement with SSDH features estimated from oceanographic observation, indicating that JGEOID2008 has an accuracy within 10 cm. The geoid model is strongly expected to serve as a reference in ocean dynamics studies.
机译：通过结合基于GRACE（重力恢复和气候实验）的全球大地势模型GGM02C，地表（陆运和船载），在1×1.5弧分钟网格上开发了日本的高度改进的重力大地水准面模型JGEOID2008。重力测量，以及来自测高仪的海洋重力模型KMS2002。在该组合中，采用半离散二维小波分析/重建方法，从各个数据集中选择质量最高的空间波长信号。与GPS /水准大地水准面波动的比对表明，JGEOID2008比以前的模型JGEOID2004有了显着改进，并且揭示了JGEOID2004中包含的长波长系统误差已被有效消除。 JGEOID2008与孤立岛屿的潮汐站平均海面高度的偏差可与日本海，南塞群岛和伊豆岛链与东京湾的海面动态高度（SSDH）的差异相比较。偏差表明与海洋观测估计的SSDH特征吻合良好，表明JGEOID2008的准确度在10 cm以内。大地水准面模型有望在海洋动力学研究中作为参考。

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