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Citation: Chen Chuqun, Shi Ping, Magnus Larson, Lennart Jönsson. Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data[J]. Acta Oceanologica Sinica, 2002, (1): 55-65.

Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data

  • Received Date: 2001-05-11
  • Rev Recd Date: 2001-08-31
  • The chlorophyll-a concentration is generally overestimated for the southern China coastal waters if the default algorithm of the SeaDAS is employed.An algorithm is developed for retrieval of chlorophyll-a concentration in the Zhujiang Estuary,Guangdong Province,China,by using simulated reflectance data.The simulated reflectance is calculated corresponding to the SeaWiFS wavelength bands,via a general model by inputting measured water components,i.e.,the suspended sediment,chlorophyll-a,and yellow substance (DOC) concentration data of 130 samples.Empirical relationships of the chlorophyll-a concentration to 240 different band combinations are investigated based on the simulated reflectance data,and the band combination,R5R6/R3R4,is found to be the optimum one for the development of an algorithm valid for the Zhujiang Estuary.This algorithm is then employed to determine the chlorophyll-a concentration from SeaWiFS data.The estimated concentrations have a better accuracy than those obtai obtained from the SeaDAS default algorithm when compared with sea truth data.The new algorithm is d}on_strated to work well and is used to derive a series of image maps of the chlorophyll-a concentration distribution for the Zhujiang Estuary and adjacent coastal areas.
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