Evaluating the Spring-Neap Tidal Effects on Chlorophyll-a Variations Based on the Geostationary Satellite

• DOI: 10.3389/fmars.2021.758538
• Publication Date: 2021-12-23T10:24:41Z
• Authors: Qinwang Xing; Huaming Yu; Haiqing Yu; Hui Wang; Shin-ichi Ito; Chunxin Yuan
• Keywords: Biogeochemical Cycle

Tides are the dominant hydrodynamic processes in most continental shelf seas and have been proven to a significant impact on both marine ecosystem dynamics biogeochemical cycles. In situ satellite observations suggested that spring-neap tide results fluctuations of chlorophyll- concentrations (Chl- ) with fortnightly period some waters. However, large number missing values low observation frequency satellite-observed Chl- recognized as major obstacle investigating regional pattern showing where what extent effects seasonal variations within relatively region. Taking Himawari-8 an example, simple algorithm appropriate for geostationary satellites was proposed this study purpose obtaining tide-related daily climatological dataset (TDCD) quantitatively estimate variations. Based time series from TDCD, signals high contribution together explanations were found specific inshore waters, especially East China Sea, Bay Bengal, South northern Australian The able induce spatio-temporal annual amplitude 12–33% mean these areas. Significant fluctuation observed temperate regions, while levels remained stable tropical Further analysis implied closely associated tidal current differences between spring neap tides. Seasonal be key driving factor regions. This provides better understanding cycles is helpful improving physical–biogeochemical models.