Preprints
https://doi.org/10.5194/egusphere-2023-2878
https://doi.org/10.5194/egusphere-2023-2878
19 Dec 2023
 | 19 Dec 2023

Linear Variation of M2 Tide in the East and South China Seas

Hao Ke, Yixin Lu, Jian Wang, Weifeng Hao, and Tianhao Ding

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.

Hao Ke, Yixin Lu, Jian Wang, Weifeng Hao, and Tianhao Ding

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2878', Philip Woodworth, 03 Jan 2024
  • RC2: 'Comment on egusphere-2023-2878', Anonymous Referee #2, 05 Jan 2024
Hao Ke, Yixin Lu, Jian Wang, Weifeng Hao, and Tianhao Ding
Hao Ke, Yixin Lu, Jian Wang, Weifeng Hao, and Tianhao Ding

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Short summary
A harmonic analysis method combined with an additional time-varying mode has been proposed for capture the linear variation of tide constituent. The results show that the annual amplitude and phase lag variations of M2 are roughly 2.0~4.0 mm/yr and 0.8~2.0°/yr in the East and South China Seas, and the peak regions of variations are mainly located in the estuary areas of inland river basins, due to the rapid changes in water depth and coastline.