Source and fate of dissolved inorganic carbon in Jiulong River, southeastern China

Yin，Xijie1; Lin，Yunpeng1,3; Liang，Cuicui1; Tao，Shuqin1; Wang，Liang1; Xu，Yonghang1; Li，Yunhai1,2

2020-11-05

10.1016/j.ecss.2020.107031

ESTUARINE COASTAL AND SHELF SCIENCE   影响因子和分区

0272-7714

1096-0015

In this study, surface water samples were collected over several seasons from the Jiulong River mainstream (North and West Rivers) and estuary from 2013 to 2014. The concentration of dissolved inorganic carbon (DIC), stable carbon isotope composition (δC), in-situ temperature, pH, and conductivity of the surface water were measured to study the source and fate of DIC in the Jiulong River. The results showed that the DIC concentrations decreased from upstream to downstream in the North River but increased in the West River, which was determined mainly by the lithology of the drainage basin. In spring, the river is fed by deep groundwater resources that are older and contain more DIC originating from carbonate weathering compared to surface water, resulting in the high concentration and δC value of DIC. Whereas during the summer and autumn, the high runoff caused by frequent precipitation dilutes the DIC concentration of river water and the contribution of soil CO is more important, resulting in lower DIC concentration and δC value. δC values indicate that the DIC in the Jiulong River was derived mainly from the chemical weathering of bedrock, and CO outgassing was one of the main fates of the riverine DIC. Results of mixing ratio calculation in freshwater and seawater suggest that additional processes existed with the mixing process, which were identified as organic carbon degradation and respiration in summer and autumn and offshore water vertical mixing in winter and spring, but in general the spatial variation of DIC in the estuary was determined mainly by mixing of freshwater and seawater. This study complements our understanding of the sources and fates of DIC in small river systems on the continental margin of the East China Sea.

Dissolved inorganic carbon Jiulong river Seasonal variation Source and fate δ13C

SCI

英语

其他

National Science Foundation of China (NSFC)[41976050][41506089][41006072] ; Scientific Research Foundation of the Third Institute of Oceanography, Ministry of Natural Resources[TIO2019028][TIO2019007]

Marine & Freshwater Biology ; Oceanography

Marine & Freshwater Biology ; Oceanography

WOS:000591635300002

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

PLANT & ANIMAL SCIENCE

2-s2.0-85092178584

Scopus

1.Third Institute of Oceanography,Ministry of Natural Resources,China
2.Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,China
3.Department of Ocean Science & Engineering,Southern University of Science and Technology,China

Yin，Xijie,Lin，Yunpeng,Liang，Cuicui,et al. Source and fate of dissolved inorganic carbon in Jiulong River, southeastern China[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2020,246.

Yin，Xijie.,Lin，Yunpeng.,Liang，Cuicui.,Tao，Shuqin.,Wang，Liang.,...&Li，Yunhai.(2020).Source and fate of dissolved inorganic carbon in Jiulong River, southeastern China.ESTUARINE COASTAL AND SHELF SCIENCE,246.

Yin，Xijie,et al."Source and fate of dissolved inorganic carbon in Jiulong River, southeastern China".ESTUARINE COASTAL AND SHELF SCIENCE 246(2020).