Geosynchronous Satellite GF-4 Observations of Chlorophyll-a Distribution Details in the Bohai Sea, China.

摘要: We analyzed the distribution of chlorophyll-a (Chla) in Bohai Sea area based on data from geosynchronous orbit optical satellite Gaofen-4 (GF-4), which was launched 2015, carrying a panchromatic multispectral sensor (PMS). This is first time GF-4 remote-sensing has been used China to detect Chla change details Sea. A new retrieved model established relationship between situ value and reflectance combination 2 4 bands, with R2 0.9685 total average relative error 37.42%. Twenty PMS images obtained 2017 2019 were applied analyze sea. The results show that: (1) built inversion PMS-1 for can extract well. high content mainly located coastal areas, such as top Laizhou Bay, Bay Liaodong being around 13 µg/L. concentration Strait northern Yellow relatively low 5 (2). Taking full advantage continuous observation geostationary satellite, high-resolution 50 m effectively short-term (changes within 10 min) concentration. changes appear at southwest northeast costal well center 3 (3) sea related environmental factors seawater temperature, salinity, illumination nutrient salts, dynamic wind, flow field tidal current.