Sources,distribution and preservation of size-fractionated particulate organic carbon in the turbidity maximum zone of the Changjiang Estuary based on water elutriation

Pan Huihui; Yao Peng; Zhao Bin; Meng Jia; Li Dong; Wang Jinpeng

doi:10.3969/j.issn.0253-4193.2015.04.001

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Pan Huihui, Yao Peng, Zhao Bin, Meng Jia, Li Dong, Wang Jinpeng. Sources,distribution and preservation of size-fractionated particulate organic carbon in the turbidity maximum zone of the Changjiang Estuary based on water elutriation[J]. Haiyang Xuebao, 2015, 37(4): 1-15. doi: 10.3969/j.issn.0253-4193.2015.04.001

Citation:

Pan Huihui, Yao Peng, Zhao Bin, Meng Jia, Li Dong, Wang Jinpeng. Sources,distribution and preservation of size-fractionated particulate organic carbon in the turbidity maximum zone of the Changjiang Estuary based on water elutriation[J]. Haiyang Xuebao, 2015, 37(4): 1-15. doi: 10.3969/j.issn.0253-4193.2015.04.001

Citation:

Pan Huihui, Yao Peng, Zhao Bin, Meng Jia, Li Dong, Wang Jinpeng. Sources,distribution and preservation of size-fractionated particulate organic carbon in the turbidity maximum zone of the Changjiang Estuary based on water elutriation[J]. Haiyang Xuebao, 2015, 37(4): 1-15. doi: 10.3969/j.issn.0253-4193.2015.04.001

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Sources,distribution and preservation of size-fractionated particulate organic carbon in the turbidity maximum zone of the Changjiang Estuary based on water elutriation

doi: 10.3969/j.issn.0253-4193.2015.04.001

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, 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, Qingdao 266100, China;Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao 266100, China

Received Date: 2014-03-31
Rev Recd Date: 2014-12-17

Abstract

Abstract

Knowledge of the transport of particulate organic carbon in large-river estuaries from the perspective of size-fractionation is key to better understand the biogeochemical processes of organic carbon during the mixing of freshwater and seawater. Suspended particulate matters (SPM) in surface water were collected along a salinity gradient in the turbidity maximum zone of the Changjiang Estuary in June 2011,and then were separated into different size fractions using the water elutriation method. Organic carbon (OC) and nitrogen,stable carbon isotopic composition and specific surface area (SSA) of these size-fractionated particles were analyzed to discuss the variation of sources,distribution and preservation of OC with the increasing salinity and their impact factors. The results showed that with the increase of salinity and particle size,the size-fractionated particulate OC (POC) gradually reduced and mainly concentrated in less than 32 μm fractions. The POC in the estuary was lower than those in the main stream,perhaps due to the special biogeochemical processes around the maximum turbidity zone,such as flocculating and settling of fine particles,microbial decomposition,etc. The results of the three end-member mixing model based on Monte-Carlo simulation indicated that the POC was mainly from riverine and deltaic sources,whereas the contribution from marine end-member was relatively small,and the average fractions of these three end-members were 40%,35% and 25%,respectively. In the freshwater end,deltaic OC of the size fractions increased with the increase of salinity,but in the seawater end,the contribution of marine OC increased,especially in the 16-32 μm fractions,with the maximum value of 39%. The SSA normalized OC contents of the 32—63μm fractions were all larger than 1.0 mg/m²,while the OC/SSA ratios of less than 32 μm fractions were in the range of 0.4 to 1.0 mg/m²,consistent with the typical characteristics of river suspended particulates. Furthermore,the OC/SSA ratios also indicated that OC in fine particulates could have been decomposed in a certain degree. However,these ratios were generally higher than those of the surface sediments in the Changjiang Estuary,which indicated that particulate OC may go through further remineralization during or after sedimentation. Preliminary estimate showed that 71% of the terrigenous OC delivered by the Changjiang was lost during sedimentation. This study helps to deeply understand the role of particulate matters with different sizes in the transport and transformation of OC in large-river estuaries,and deepen the knowledge of biogeochemical processes of OC in high turbidity estuary.
- Changjiang Estuary,
- suspended particulate matter,
- water elutriation,
- size fractionation,
- organic carbon,
- stable carbon isotope

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