The spectral absorption and distribution characteristics of CDOM in the typical waters of the East China Sea

LEI Hui; PAN De-lu; TAO Bang-yi; SHEN Liang; KANG Lin-chong; ZHANG Han-song

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LEI Hui, PAN De-lu, TAO Bang-yi, SHEN Liang, KANG Lin-chong, ZHANG Han-song. The spectral absorption and distribution characteristics of CDOM in the typical waters of the East China Sea[J]. Haiyang Xuebao, 2009, 31(2): 57-62.

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The spectral absorption and distribution characteristics of CDOM in the typical waters of the East China Sea

1.
Zhejiang University, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

Received Date: 2008-07-20
Rev Recd Date: 2009-01-05

Abstract

Abstract

It is very practical to learn the spectral absorption characteristics of chromophoric dissolved organic matter (CDOM) in the seawater which is one of the main parameters for water quality remote sensing monitoring Owing to the Changjiang River input, the seawater of the East China Sea (ECS) has a complex optical environment and thus is relative less there.Based on a large in situ survey organized on the ECS, a dat abase of CDOM spectral absorption was potten covering four seasons, and a spectral model was established including different water types in this region as well as the distribution on typical bands.The result shows that the diverse spectral characteristics between alongshore water influenced by terrigenous input heavily and the water in the open sea, e.g., the absorption coefficient values in the Hangzhou Bay are extremely high on short bands and decay sharply as the wavelength went longer, whereas the values in the open sea are always much lower.The distribution reflected the terrigenous origin characteristics of CDOM and it also had seasonal variations especially on short wavelength.The result validates that CDOM can be used as an important parameter for the nearshore water quality monitoring.A fluorescence measurement of CDOM was done, and a good linear relationship between it and the absorption was given out, which could be a valuable reference.
- East China Sea,
- CDOM,
- absorption coefficient,
- fluorescence characteristics

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