Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary

Ye Jun; Yao Peng; Xu Yahong; Wang Jinpeng; Zhao Bin

doi:10.3969/j.issn.0253-4193.2019.04.002

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Ye Jun, Yao Peng, Xu Yahong, Wang Jinpeng, Zhao Bin. Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary[J]. Haiyang Xuebao, 2019, 41(4): 15-26. doi: 10.3969/j.issn.0253-4193.2019.04.002

Citation:

Ye Jun, Yao Peng, Xu Yahong, Wang Jinpeng, Zhao Bin. Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary[J]. Haiyang Xuebao, 2019, 41(4): 15-26. doi: 10.3969/j.issn.0253-4193.2019.04.002

Citation:

Ye Jun, Yao Peng, Xu Yahong, Wang Jinpeng, Zhao Bin. Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary[J]. Haiyang Xuebao, 2019, 41(4): 15-26. doi: 10.3969/j.issn.0253-4193.2019.04.002

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Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2019.04.002

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China
2.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China;Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
Joint Laboratory for Maritime Equipment Technology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2018-05-04
Rev Recd Date: 2018-07-09

Abstract

Abstract

The biogeochemical processes of carbon in estuaries are an important part of global carbon cycle. Dissolved inorganic carbon (DIC), stable carbon isotopic abundance of (δ¹³C_DIC), dissolved organic carbon (DOC), chromophoric dissolved organic matter (CDOM), particle organic carbon (POC), stable carbon isotopic abundance of POC (δ¹³C_POC), atomic element ratios (N/C) and other related parameters were analyzed in order to study the distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary in July 2014. The concentrations of DIC, DOC and POC range from 1 583.2 to 1 739.6 μmol/L, 128.4 to 369.4 μmol/L, 51.2 to 530.8 μmol/L, respectively. Similar with CDOM, these carbon species increase first and then decrease from the inner estuary to outer estuary, showing non-conservative mixing behaviors with salinity. The addition behavior of these carbon species mostly occurs in the turbidity maximum zone. In contrast, the values of δ¹³C_DIC and δ¹³C_POC first decrease and then increase from the inner estuary to outer estuary, with the minimum values are found in the river mouth (-9.7‰ and -26.7‰, respectively). The increasing of carbon concentrations and decreasing of δ¹³C_DIC, δ¹³C_POC values near the river mouth could be attributed to sediment re-suspension and/or microbial processes. The results of a three end-member mixing model based on Monte-Carlo Simulation indicate that the sources of POC vary greatly from the inner estuary to outer estuary. Terrestrial organic carbon is the main source of POC in the inner estuary, with the average value of 62.3%, whereas contribution of marine organic carbon gradually increase in the outer estuary. The results of CDOM related parameters show that the CDOM is mainly derived from terrestrial input, however, marine sources and human activities may also have impacts in the Changjiang Estuary.
- Changjiang Estuary,
- Turbidity Maximum Zone,
- inorganic carbon (IC),
- organic carbon (OC),
- isotope,
- chromophoric dissolved organic matter (CDOM)

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