The tidal displacement field at Earth's surface determined using global GPS observations

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题名:	The tidal displacement field at Earth's surface determined using global GPS observations
作者:	趙丰;Yuan, Linguo;Chao, Benjamin Fong;Ding, Xiaoli;Zhong, Ping
贡献者:	地球科學學院地球科學學系
关键词:	body tides;Coastal zone;Constituents;Displacement;Diurnal variations;Earth;Earth's structure;Estimates;Geodetics;Geophysics;Global positioning systems;GPS;Heterogeneity;lateral heterogeneity;Mathematical models;ocean tidal loading;Oceans;Stations;Tides
日期:	2013-05-01
上传时间:	2026-04-23 11:48:49 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： We investigate the 3‐D tidal displacement field on Earth's surface recorded globally by 456 continuous global positioning system (GPS) stations of IGS spanning 1996–2011, for eight principal diurnal and semidiurnal tidal constituents. In‐phase and quadrature amplitudes of the residual tidal displacements, after removal of an a priori body tide model, are estimated using the precise point positioning (PPP) technique on the daily GPS data; the resultant daily estimates are combined to derive final estimates for each tide at each station. The results are compared with the predictions of eight recent global ocean tide models, separately for coastal (307) and inland (149) stations. We show that GPS can provide tidal displacement estimates accurate to the level of 0.12 mm (horizontal) and 0.24 mm (vertical) for the lunar‐only constituents (M2, N2, O1, and Q1) and less favorably for solar‐related tidal constituents (S2, K2, K1, and P1), although improved by ambiguity resolution. Most recent ocean tide models fit the GPS estimates equally well on the global scale but do not agree well between them in certain coastal areas, especially for the vertical displacements, suggesting the existence of model uncertainties near shallow seas. The tidal residuals for the inland stations after removing both body tides and ocean tidal loading (OTL) furthermore show clear continental‐scale spatial coherence, implying deficiencies of the a priori body tide modeling in catching lateral heterogeneity in elastic as well as inelastic properties in the Earth's deep interior. We assert that the GPS tidal displacement estimates now achieve sufficient accuracy to potentially provide constraints on the Earth's structure. Key Points3‐D tidal displacements for eight constituents are estimated at 456 IGS stationsThe sub‐millimeter tidal residuals display continental‐scale spatial coherenceThe results can potentially constrain Earth's interior structure 其他題名： J. Geophys. Res. Solid Earth 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2013-05 出處： Journal of geophysical research. Solid earth, 2013-05, Vol.118 (5), p.2618-2632 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2013. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9313 識別號： ISSN: 2169-9356 識別號： EISSN: 2169-9356 識別號： DOI: 10.1002/jgrb.50159
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