Linear Variation of M2 Tide in the East and South China Seas
Abstract. Considering the time-varying tidal parameters in offshore China, we proposed a harmonic analysis method combined with an additional time-varying mode. Tidal analysis was performed on nearly 20 years of sea surface altimetry data from the Jason 1-3, Envisat, and ERS-2 satellites, and 13 tide stations located along the coast of the southeast China Sea. The results show that there are several peak regions for the amplitude and phase lag change rate of the M2 tide in the East China Sea and the South China Sea, which are mainly located in the estuary areas of inland river basins, such as the Yangtze Estuary, the Pearl River Estuary, and the Nanliu Estuary, and the variation ranges are roughly 2.0–4.0 mm/yr and 0.8–2.0°/yr. The variations in tidal parameters were attributed to the changes in water depth and coastline in the estuaries.
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