光谱学与光谱分析 |
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Quantitative Analysis of Chlorophyll-a Reflectance Spectrum in Red Spectral Region of Water |
MA Wan-dong1, 2, 3, XING Qian-guo1, 4*, ZHANG Yuan-zhi5, SHI Ping1, LIU Ya-long1 |
1. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China 2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4. CNRS UMR 8187 LOG, 28 avenue Foch, BP 80, F-62930, Wimereux, France 5. Institute of Space and Earth Information Science, the Chinese University of Hong Kong, Hong Kong, China |
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Abstract The chlorophyll-a concentration in waters is one of the main parameters of water color remote sensing in case Ⅱ waters. There is a reflectance peak in red band region because of inherent optical properties. Based on the coefficients of absorption and backscattering of waters, colored dissolved organic matter (CDOM), tripton and chlorophyll-a, the reflectance of remote sensing was simulated according to the forward radiation transfer model without the consideration of fluorescence peak. The reflectance peak intensity and reflectance peak position at different wavelengths in red band region were analyzed with different chlorophyll-a concentration. There is a good linear relationship between the red reflectance peak intensity and chlorophyll-a concentration when the chlorophyll-a concentration is 1-50 μg·L-1. But the linear relationship between the reflectance peak intensity and chlorophyll-a concentration will decrease with the increasing chlorophyll-a concentration. When chlorophyll-a concentration is up to 1 000 μg·L-1, the logarithm relationship between the reflectance peak intensity and chlorophyll-a concentration is better than linear relationship. The wavelength position of reflectance peak in red band region will shift towards larger wavelength at logarithmic growth rate with increasing chlorophyll-a concentration, and the logarithm relationship will be more apparent with the inoreasing chlorophyll-a concentration. The same trend happens to the reflectance peak intensity and the wavelength position of peak in red region with different in-water constituents, such as CDOM, tripton and so on. Furthermore, according to the comparison with fluorescence peak, the authors also found that the reflectance peak intensity and the wavelength position of peak in red region are different from those of the fluorescence peak.
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Received: 2009-01-16
Accepted: 2009-04-20
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Corresponding Authors:
XING Qian-guo
E-mail: qgxing@yic.ac.cn
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