Modeling the contribution of the microbial carbon pump to carbon sequestration in the South China Sea |
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| Authors: | Wenfang Lu Xiaohai Yan Yuwu Jiang |
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| Institution: | 1.State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences,Xiamen University,Xiamen,China;2.Center for Remote Sensing, College of Earth, Ocean and Environment,University of Delaware,Newark,USA;3.Joint Institute for Coastal Research and Management,Xiamen University,Xiamen,China;4.Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education, National Engineering Research Centre of Geospatial Information Technology,Fuzhou University,Fuzhou,China |
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| Abstract: | The two key mechanisms for biologically driven carbon sequestration in oceans are the biological pump (BP) and the microbial carbon pump (MCP); the latter is scarcely simulated and quantified in the China seas. In this study, we developed a coupled physical-ecosystem model with major MCP processes in the South China Sea (SCS). The model estimated a SCS-averaged MCP rate of 1.55 mg C m?2 d?1, with an MCP-to-BP ratio of 1:6.08 when considering the BP at a depth of 1000 m. Moreover, the ecosystem responses were projected in two representative global warming scenarios where the sea surface temperature increased by 2 and 4°C. The projection suggested a declined productivity associated with the increased near-surface stratification and decreased nutrient supply, which leads to a reduction in diatom biomass and consequently the suppression of the BP. However, the relative ratio of picophytoplankton increased, inducing a higher microbial activity and a nonlinear response of MCP to the increase in temperature. On average, the ratio of MCP-to-BP at a 1000-m depth increased to 1:5.95 with surface warming of 4°C, indicating the higher impact of MCP in future ocean carbon sequestration. |
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