Variability of terrigenous dissolved organic matter as a response to coastal plume in Zhoushan area of the East China Sea

HUANG Qing-hui; WU Jia-xue; JIANG Yu-lin; LI Jian-hua

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HUANG Qing-hui, WU Jia-xue, JIANG Yu-lin, LI Jian-hua. Variability of terrigenous dissolved organic matter as a response to coastal plume in Zhoushan area of the East China Sea[J]. Haiyang Xuebao, 2011, 33(1): 66-73.

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Variability of terrigenous dissolved organic matter as a response to coastal plume in Zhoushan area of the East China Sea

1.
Key Laboratory of Yangtze River Water Environment(Ministry of Education), College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Yangtze River Water Environment(Ministry of Education), College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangz

Received Date: 2010-01-28

Abstract

Abstract

In the summer of 2007, one cruise survey on terrigenous chromophoric dissolved organic matter (CDOM) was carried out in the Zhoushan sea area of the East China Sea.Fluorescence intensities at the excitation wavelength 370 nm /the emission wavelength 460 nm and absorption coefficients at the wavelength 355 nm were determined, which represented terrigenous CDOM concentrations. Fluorescence indices were also measured as the indicator of CDOM sources. The results show that CDOM concentrations roughly tend to decrease in the direction from the land to the sea, but there is some phenomenon of vertical jump. High concentrations of CDOM in the surface water were observed at some sites of the northeast of the Zhoushan sea area from time to time, but they showed a great variability, which suggesting that the waters might be subject to the impact of estuarine plume of the Changjiang River. It is found at a continuous observation station that the concentrations of CDOM at the low tide are often higher than those at the high tide. During the mixing process between river water and seawater, the CDOM concentrations and light absorption coefficients at 355 nm have a significant negative linear relationship with the salinity. That is to say, CDOM takes on the conservative behavior in general. However, CDOM concentrations are significantly lower than the theoretical dilution values in the low salinity zone, indicating a non-conservative removal behavior of CDOM in the suspended sediment front.The fluorescence indices are almost fixed at 1.50 in most of water samples with the salinity between 24 and 31, indicating that CDOM can be dominated with terrigenous sources. However, the fluorescence indices vary from 1.70 to 1.90 and above in low salinity (<24) zone, indicating that CDOM can be dominated with marine sources; it is related to the significant removal of terrigenous fractions of CDOM in this zone with low salinity and high turbidity.These results prove that terrigenous organic matter can be used as a good tracer and indicate the variability of water quality in the coastal plume.
- terrigenous dissolved organic matter,
- absorption coefficient,
- fluorescence index,
- water mass,
- estuarine front,
- East China Sea

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