日本沿岸における平均海面位の重力ポテンシャル値の推定

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タイトル別名
  • Estimation of Geopotential Values of Mean Sea Level along Japanese Coast
  • ニホン エンガン ニ オケル ヘイキン カイメンイ ノ ジュウリョク ポテンシャルチ ノ スイテイ

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説明

The smoothing method proposed by Kuroishi (2012) is applied to tidal records at 35 tidal stations along the Japanese coast and resulting time series of smoothed tidal heights are combined with GNSS observation at continuous GNSS sites installed adjacent to the tidal stations, yielding the three-dimensional geocentric positions of mean sea level at the tidal stations. Then a high-resolution global geopotential model is used to compute the geopotential values of MSL at the tidal stations. The average deviation of the geopotential values at 32 stations, all of which are referred uniquely to the origin of the Japanese vertical control network, from the potential of the geoid defined by IERS Conventions (2010) is -3.83±1.35 m2/s2, corresponding to +39.1±13.8 cm in height. We compare the height deviations to leveled heights of MSL and the differences between them show the mean bias of about +26.9 cm with the standard deviation of 7.3 cm. It indicates that the Japanese vertical datum is about 27 cm above the global geoid and that the two results of MSL heights are consistent at a level better than 10 cm. Comparison of mean dynamic ocean topography between the estimated MSLs at the tidal stations and an altimetry-derived global model shows some spatial features in their discrepancy that match qualitatively with tilts induced by geostrophic currents: the Kuroshio, the Tsushima Current, the Tsugaru Warm Current, and the Oyashio.

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