Abstract
Research on the optical characteristics of water color constituents in Chagan Lake of Jilin Province, Northeast China was carried out in order to investigate the variability of the spectra absorption parameters as inputs to bio-optical models and remote sensing algorithms for converting observed spectral signals into water quality information. Samples of total particulates, non-algal particles and colored dissolved organic matter (CDOM) were first prepared by quantitative filter technique (QFT) and then absorption coefficients of these color producing agents were determined by spectrophotometry. Spectral characteristics of absorption coefficients by total particulate matter, spectral specific absorption dependency on chlorophyll concentration (Chl-a) of phytoplankton, spectral absorption slopes variation for CDOM and non-algal particles and their corresponding reasons were examined and clarified over five months of 2009 and 2010 in this study. Results suggest that total particulate spectral absorption in Chagan Lake is mainly dominated by non-algal particles in most cases, but phytoplankton could be the dominant contributor when chlorophyll concentration is high (up to 84.48 mg/m3 in autumn 2010). The specific absorption coefficients of phytoplankton particulate (a*ph(λ)) dependency on Chl-a is significantly variable due to relative contributions of package effect and accessory pigments, and the parameters of power function are clearly biased on a long time span. The sources of variability in spectral absorption slopes of CDOM and non-algal particles are mainly attributed to the changing proportions of high molecular weight humic acids and mineral suspended sediments in waters, respectively.
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Foundation item: Under the auspices of Knowledge Innovation Programs of Chinese Academy of Sciences (No. KZCX2-YW-341, KZCX2-YW-340), Key Project of Jilin Province Scientific and Technological Development Program (No. 20080425)
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Wang, Y., Liu, D., Song, K. et al. Characterization of water constituents spectra absorption in Chagan Lake of Jilin Province, Northeast China. Chin. Geogr. Sci. 21, 334–345 (2011). https://doi.org/10.1007/s11769-011-0473-1
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DOI: https://doi.org/10.1007/s11769-011-0473-1