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Modeling long-term change of planktonic ecosystems in the northern South China Sea and the upstream Kuroshio Current
Li, Qian P.; Wang, Yanjun; Dong, Yuan; Gan, Jianping; qianli@scsio.ac.cn
2015
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume120Issue:6Pages:3913-3936
Subtype2169-9275
AbstractField studies suggested that the biogeochemical settings and community structures are substantial different between the central Northern South China Sea (NSCS) and the upstream Kuroshio Current (KC). In particular, the water column of KC is characterized by substantially lower nutrients and productivity but higher Trichodesmium abundance and nitrogen fixation compared to the NSCS. The mechanism driving the difference of the two marine ecosystems, however, remains inadequately understood. Here, a one-dimensional biogeochemical model was developed to simulate the long-term variability of lower-trophic planktonic ecosystem for two pelagic stations in the NSCS and the KC near the Luzon Strait. The physical model included the vertical mixing driven by air-sea interaction and the Ekman pumping induced by wind stress curl. The biological model was constructed by modifying a nitrogen-based NPZD model with the incorporation of phosphorus cycle and diazotroph nitrogen fixation. After validation by several field data sets, the model was used to study the impact of long-term physical forcing on ecosystem variability in the two distinct stations. Our results suggested that nutrient transport above nitracline during summer was largely controlled by vertical turbulent mixing, while Ekman pumping was important for nutrient transport below the nitracline. Our results also indicated that diazotroph community structure and N-2 fixation in the NSCS and the KC could be strongly influenced by physical processes through the impacts on vertical nutrient fluxes. The disadvantage of diazotroph in the NSCS in compared to the KC during the summer could be attributed to its high nitrate fluxes from subsurface leading to outcompete of diazotrophs by faster growing nondiazotroph phytoplankton.
Department[Li, Qian P.; Wang, Yanjun; Dong, Yuan] Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Gan, Jianping] Hong Kong Univ Sci & Technol, Div Environm, Kowloon, Hong Kong, Peoples R China ; LTO
KeywordNorthern South China Sea Kuroshio Current Physical And Biological Modeling Planktonic Ecosystems Nitrogen Fixation
Subject AreaOceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15081
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorqianli@scsio.ac.cn
Recommended Citation
GB/T 7714
Li, Qian P.,Wang, Yanjun,Dong, Yuan,et al. Modeling long-term change of planktonic ecosystems in the northern South China Sea and the upstream Kuroshio Current[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2015,120(6):3913-3936.
APA Li, Qian P.,Wang, Yanjun,Dong, Yuan,Gan, Jianping,&qianli@scsio.ac.cn.(2015).Modeling long-term change of planktonic ecosystems in the northern South China Sea and the upstream Kuroshio Current.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,120(6),3913-3936.
MLA Li, Qian P.,et al."Modeling long-term change of planktonic ecosystems in the northern South China Sea and the upstream Kuroshio Current".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 120.6(2015):3913-3936.
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