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

Earth, Planets and Space volume 61, pages 807–813 (2009)Cite this article

Abstract

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.

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  1. Geographical Survey Institute, 1 Kitasato, Tsukuba, Ibaraki, 305-0811, Japan

    Yuki Kuroishi

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  1. Yuki Kuroishi
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Correspondence to Yuki Kuroishi.

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Kuroishi, Y. Improved geoid model determination for Japan from GRACE and a regional gravity field model. Earth Planet Sp 61, 807–813 (2009). https://doi.org/10.1186/BF03353191

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