Cycling and Budgets of Organic and Black Carbon in Coastal Bohai Sea, China: Impacts of Natural and Anthropogenic Perturbations |
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Organic carbon (OC) cycling in coastal seas that connect terrestrial and open oceanic ecosystems is a dynamic and disproportionately important component of oceanic and global carbon cycles. However, OC cycling in coastal seas needs to be better constrained, particularly for geochemically important black carbon (BC). In this study, we conducted multimedium sampling campaigns, including atmospheric deposition, river water, seawater, and sediments in coastal Bohai Sea (BS) in China. We simultaneously quantified particulate OC (POC), particulate BC (PBC), dissolved OC (DOC), and dissolved BC (DBC) and investigated the cycling and budgets of OC and BC. The cycling and budgets of each individual particulate phase (i.e., POC versus PBC) and dissolved phase (i.e., DOC versus DBC) displayed similar patterns, but there were some distinct differences between the particulate and dissolved phases. In the particulate phases, atmospheric and riverine delivery dominated exogenous inputs (>80%), sequestration to sediments dominated removal (similar to 70%), and exchanges in the Bohai Strait resulted in net export. In the dissolved phases, exchanges in the Bohai Strait dominated both import and export and were in a relatively dynamic equilibrium. We found that both natural perturbations, such as spring dust storms, and anthropogenic activity, exerted significant impacts on BS carbon cycling. The integration of regional and global source-to-sink process databases made it clear that future BC studies should calculate PBC and DBC fluxes independently. Continuous field observational studies, more details of the biogeochemical processes involved, and consistent BC quantification methods are urgently needed to elucidate coastal OC and BC cycling. Publication name | GLOBAL BIOGEOCHEMICAL CYCLES, 32 (6):971-986; 10.1029/2017GB005863 JUN 2018 | Author(s) | Fang, Yin; Chen, Yingjun; Tian, Chongguo; Wang, Xiaoping; Lin, Tian; Hu, Limin; Li, Jun; Zhang, Gan; Luo, Yongming | Corresponding author(s) | CHEN Yingjun yjchentj@tongji.edu.cn Tongji Univ, Coll Environm Sci & Engn, Key Lab Cities Mitigat & Adaptat Climate Change S, Shanghai, Peoples R China. Shanghai Inst Pollut Control & Ecol Secur, Shanghai, Peoples R China. TIAN Chongguo cgtian@yic.ac.cn Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai, Peoples R China. LIN Tian lintian@vip.gyig.ac.cn Chinese Acad Sci, Guiyang Inst Geochem, State Key Lab Environm Geochem, Guiyang, Guizhou, Peoples R China. | View here for the details
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