气候变化领域集成服务门户(CCPortal): Biogeochemical Responses to Nutrient Fluxes in the Open South China Sea: A 3-D Modeling Study

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DOI	10.1029/2020JC016895
	Biogeochemical Responses to Nutrient Fluxes in the Open South China Sea: A 3-D Modeling Study
	Shuai Y.; Li Q.P.; Wu Z.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Recent Bio-Argo observations revealed a spatial difference of seasonal chlorophyll-a pattern in the South China Sea (SCS) with permanent subsurface chlorophyll-a maximum layer in the central SCS (CSCS) but intense winter chlorophyll-a bloom in the northern SCS (NSCS). A three-dimensional physical-biogeochemical model was used to simulate the temporal change of upper ocean physics and biogeochemistry of the open SCS following the trajectories of the two Bio-Argo floats to explore mechanisms driving the difference between the two very contrasting marine ecosystems. The model reasonably reproduced the Bio-Argo vertical observations in both regions. In the model, high nitrate fluxes had supported a strong winter chlorophyll-a and productivity in the NSCS, while low nitrate fluxes in the CSCS leading to a stable subsurface chlorophyll-a layer throughout the year. We found that nitrate fluxes in the north were controlled by diffusion during the early winter but by advection during the late winter. Both buoyancy and wind forcing contributed to increased diffusive nutrient fluxes by mixing nutrients below the nutricline in the early winter of the NSCS. A strong upwelling during the late winter in the north was supported by eddy-Ekman pumping, particularly the nonlinear effect induced by eddy vorticity gradient. The finding is consistent with the change of vertical advection in both directions and magnitudes in the north throughout the year. The eddy-driven difference in advection between the two regions was further confirmed by substantially larger eddy kinetic energies and eddy activities in the north. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	3-D physical-biological modeling; eddy-Ekman pumping; nitrate fluxes; seasonal phytoplankton variations; the South China Sea
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186316
作者单位	State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
推荐引用方式 GB/T 7714	Shuai Y.,Li Q.P.,Wu Z.. Biogeochemical Responses to Nutrient Fluxes in the Open South China Sea: A 3-D Modeling Study[J],2021,126(5).
APA	Shuai Y.,Li Q.P.,&Wu Z..(2021).Biogeochemical Responses to Nutrient Fluxes in the Open South China Sea: A 3-D Modeling Study.Journal of Geophysical Research: Oceans,126(5).
MLA	Shuai Y.,et al."Biogeochemical Responses to Nutrient Fluxes in the Open South China Sea: A 3-D Modeling Study".Journal of Geophysical Research: Oceans 126.5(2021).