Distribution, sources, and seasonal variation of colored dissolved organic matter along salinity gradients in the Changjiang Estuary

Xu Yahong; Yao Peng; Su Rongguo; Zhao Bin

doi:10.3969/j.issn.0253-4193.2017.06.003

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Xu Yahong, Yao Peng, Su Rongguo, Zhao Bin. Distribution, sources, and seasonal variation of colored dissolved organic matter along salinity gradients in the Changjiang Estuary[J]. Haiyang Xuebao, 2017, 39(6): 21-32. doi: 10.3969/j.issn.0253-4193.2017.06.003

Citation:

Xu Yahong, Yao Peng, Su Rongguo, Zhao Bin. Distribution, sources, and seasonal variation of colored dissolved organic matter along salinity gradients in the Changjiang Estuary[J]. Haiyang Xuebao, 2017, 39(6): 21-32. doi: 10.3969/j.issn.0253-4193.2017.06.003

Citation:

Xu Yahong, Yao Peng, Su Rongguo, Zhao Bin. Distribution, sources, and seasonal variation of colored dissolved organic matter along salinity gradients in the Changjiang Estuary[J]. Haiyang Xuebao, 2017, 39(6): 21-32. doi: 10.3969/j.issn.0253-4193.2017.06.003

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Distribution, sources, and seasonal variation of colored dissolved organic matter along salinity gradients in the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2017.06.003

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
3.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2016-10-08
Rev Recd Date: 2016-12-15

Abstract

Abstract

Absorption and fluorescence spectroscopies were used to examine the distribution, composition, sources and mixing behavior of colored dissolved organic matter (CDOM) in the Changjiang estuary in March and July 2015. The characteristics of fluorescent components of CDOM in the Changjiang Estuary were determined by fluorescence excitation emission matrix spectroscopy (EEMs) combined with parallel factor analysis (PARAFAC).Three humic-like components, i.e., C1(260,375/490 nm), C2(365/440 nm) and C3(330/400 nm) and one protein-like component C4 (295/345 nm) were identified by EEMs-PARAFAC. The distribution and non-conservative mixing behavior of these four components were consistent with the total fluorescence intensity (TFI) both in March and July 2015, first increasing and then gradually decreasing from the inner estuary to outside the estuary, with the additional behavior and highest value observed at Turbidity Maximum Zone and removal process outside the estuary. Ranging from 1.12 to 7.19 in March and 0.87 to 6.71 in July, the humification index (HIX) values showed that CDOM in March had a higher degree of humification than that in July. The biological index (BIX) values ranged from 0.76 to 1.11 and 0.62 to 1.15 in March and July respectively, suggesting a greater contribution of biological activities to CDOM in July. In March, The average value of α(355) was 0.55 m^-1, lower than that in July (0.61 m^-1), reflecting higher content of CDOM in summer. The seasonal variation of S_R was not obvious, increasing along the salinity in both seasons, which indicated that the average molecular weight of CDOM increased from the inside to the outside of the Changjiang Estuary.
- Changjiang Estuary,
- turbidity maximum zone,
- CDOM,
- EEMs-PARAFAC,
- absorption spectroscopy,
- seasonal variation

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References

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