| Chen Chuqun,Shi Ping,Magnus Larson,Lennart Jönsson. 2002. Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data. Acta Oceanologica Sinica, (1):55－65 |
| Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data |
| Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data |
| Received:May 11, 2001 Revised:August 31, 2001 |
| DOI： |
| Key words:Chlorophyll-a ocean color remote sensing algorithm coastal water |
| 中文关键词: Chlorophyll-a ocean color remote sensing algorithm coastal water |
| 基金项目:This research was supported by the project of the Chinese Academy of Sciences (CAS) under the contract No. KZCX2-202; the International Cooperation Program of Guangdong Province under the contract No. 99M05004Z; the Scienc Foundation Program of Guangdong Province under the contract No.990311. |
| Author Name | Affiliation | | Chen Chuqun | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | Shi Ping | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | Magnus Larson | Department of Water Resources Engineering, Lund University, P. O. Box 118 | | Lennart Jönsson | Department of Water Resources Engineering, Lund University, P. O. Box 118 |
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| Abstract: |
| 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. |
| 中文摘要: |
| 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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