Abstract
In this study, to meet the need for accurate tidal prediction, the accuracy of global ocean tide models was assessed in the South China Sea (0°–26°N, 99°–121°E). Seven tide models, namely, DTU10, EOT11a, FES2014, GOT4.8, HAMTIDE12, OSU12 and TPXO8, were considered. The accuracy of eight major tidal constituents (i.e., Q1, O1, P1, K1, N2, M2, S2 and K2) were assessed for the shallow water and coastal areas based on the tidal constants derived from multi-mission satellite altimetry (TOPEX and Jason series) and tide gauge observations. The root mean square values of each constituent between satellite-derived tidal constants and tide models were found in the range of 0.72–1.90 cm in the deep ocean (depth>200 m) and 1.18–5.63 cm in shallow water area (depth<200 m). Large inter-model discrepancies were noted in the Strait of Malacca and the Taiwan Strait, which could be attributable to the complicated hydrodynamic systems and the paucity of high-quality satellite altimetry data. In coastal regions, an accuracy performance was investigated using tidal results from 37 tide gauge stations. The root sum square values were in the range of 9.35–19.11 cm, with the FES2014 model exhibiting slightly superior performance.
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Acknowledgements
Satellite altimetry data used in this study were developed, validated, and distributed by the CTOH/LEGOS, France. We acknowledge the CTOH for providing the satellite-derived harmonic constants of tidal constituents, PSMSL for providing the tide gauge data, and NOAA for providing the IB correction data.
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Foundation item: The National Key Research and Development Program of China under contract Nos 2017YFC0306003 and 2016YFB0501703; the National Natural Science Foundation of China under contract Nos 41876111, 41706115 and 41806214.
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Fu, Y., Feng, Y., Zhou, D. et al. Accuracy assessment of global ocean tide models in the South China Sea using satellite altimeter and tide gauge data. Acta Oceanol. Sin. 39, 1–10 (2020). https://doi.org/10.1007/s13131-020-1685-y
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DOI: https://doi.org/10.1007/s13131-020-1685-y