| Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data |
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| 作者姓名： | Chen Chuqun Shi Ping Magnus Larson Lennart J&#;nsson |
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| 作者单位： | Chen Chuqun，Shi Ping，Magnus Larson，Lennart Jnsson1. South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China. Email: cqchen@ scsio. ac. en2. Department of Water Resources Engineering，Lund University，P.O. Box 118 |
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| 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 Guan |
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| 摘 要： | The chlorophyll-a concentration is generally overestimated for the southern China coastalwaters 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, R_5R_6/R_3R_4, 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
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| 关 键 词： | Chlorophyll-a ocean color remote sensing algorithm coastal water |
| 收稿时间： | 2001/5/11 0:00:00 |
| 修稿时间： | 2001/8/31 0:00:00 |
Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data |
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| Chen Chuqun,Shi Ping,Magnus Larson,Lennart J&#;nsson.Estimation of chlorophyll-a concentration in the Zhujiang Estuary from SeaWiFS data[J].Acta Oceanologica Sinica,2002,21(1):55-65. |
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| Authors: | Chen Chuqun Shi Ping Magnus Larson and Lennart J&#;nsson |
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| Institution: | 1.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China2.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 coastalwaters 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, R_5R_5/R_3R_4, 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 obtained from the SeaDAS default algorithm when compared with sea truth data. The new algorithm is demonstrated 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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| Keywords: | Chlorophyll-a ocean color remote sensing algorithm coastal water |
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