光谱学与光谱分析 |
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Near Ultraviolet Absorption Spectral Properties of Chromophoric Dissolved Organic Matter in the North Area of Yellow Sea |
WANG Lin, ZHAO Dong-zhi*, YANG Jian-hong, CHEN Yan-long |
National Marine Environmental Monitoring Center, Dalian 116023, China |
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Abstract Chromophoric dissolved organic matter (CDOM) near ultraviolet absorption spectra contains CDOM molecular structure, composition and other important physical and chemical information. Based on the measured data of CDOM absorption coefficient in March 2009 in the north area of Yellow Sea, the present paper analyzed near ultraviolet absorption spectral properties of CDOM. The results showed that due to the impact of near-shore terrigenous input, the composition of CDOM is quite different in the north area of Yellow Sea, and this area is a typical case Ⅱ water; fitted slope with specific range of spectral band and absorption coefficient at specific band can indicate the relative size of CDOM molecular weight, correlation between spectral slope of the Sg,275-300, Sg,300-350, Sg,350-400 and Sg,250-275 and the relative size of CDOM molecular weight indicative parameter M increases in turn and the highest is up to 0.95. Correlation between ag(λ) and M value increases gradually with the increase in wavelength, and the highest is up to 0.92 at 400 nm; being correlated or not between spectral slope and absorption coefficient is decided by the fitting-band wavelength range for the spectra slope and the wavelength for absorption coefficient. Correlation between Sg,275-300 and ag(400) is the largest, up to 0.87.
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Received: 2010-02-22
Accepted: 2010-05-26
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Corresponding Authors:
ZHAO Dong-zhi
E-mail: dzzhao@nmemc.gov.cn
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