GPS Height and Gravity Variations Due to Ocean Tidal Loading Around Taiwan |
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| Authors: | Ta-Kang Yeh Cheinway Huang Guochang Xu |
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| Institution: | (1) Institute of Geomatics and Disaster Prevention Technology, Ching Yun University, No. 229, Jiansing Rd., Jhongli, 320, Taiwan, ROC;(2) Department of Civil Engineering, National Chiao Tung University, No. 1001, Tahsueh Rd., Hsinchu, 300, Taiwan, ROC;(3) Department of Geodesy and Remote Sensing, GeoForschungsZentrum Potsdam, Telegrafenberg A17, 14473 Potsdam, Germany |
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| Abstract: | This study presents predicts ocean tidal loading (OTL) effects using a Green’s function approach and validates a novel tidal
model for Taiwan. Numerical integration of OTL is performed using the Gauss quadrature method and a local tidal model for
the inner zone and a global model for the outer zone. Observed time series of GPS-derived vertical displacements and gravity
variations (3–7 days) at five co-located GPS-gravimeter stations along the South East China and Taiwan coasts were utilized
to assess the accuracy of the proposed models and two other models. The OTL-induced gravity variations are 3–16 μgal and the
vertical site displacements are 13–27 mm. Generally, an OTL model using a mixed global and local tidal model generates better
agreement with the observations than an OTL model using a global tidal model only. However, containing a local model inside
a global model does not always produce a good agreement with the observations. The relatively large discrepancies between
modeled and observed OTL values at some stations indicate that there is a need for an improved local tidal model in the study
area.
An erratum to this article can be found at |
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| Keywords: | GPS Gravimeter Ocean tidal loading Taiwan |
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