The asymmetric distribution of phytoplankton in anticyclonic eddies in the western South China Sea
Liu, FF; Tang, SL; Huang, RX; Yin, KD; yinkd@mail.sysu.edu.cn
2017
发表期刊DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷号120页码:29-38
摘要An anticyclonic eddy's periphery is characterized by large horizontal density gradients, strain and vertical velocity. In this paper we document the asymmetric distribution of phytoplankton around the periphery of anticyclonic eddies in the western South China Sea based on 432 eddies detected from satellite data. The high level of phytoplankton occurs consistently at the northwestern periphery of eddies, with a maximum positive chlorophyll anomaly greater than 0.01 mg m(-3). The asymmetric distribution of phytoplankton primarily tags the non-uniform surface velocity field varying from 0.15 m s(-1) to 0.3 m s(-1) along the eddy's periphery. The coastal boundary and off-coast jet may be the primary cause of the non-uniform flow. Associated with the non-uniform flow speed, the combined effects of the velocity convergence and steepened northwestern part of the eddies act to sharpen the density fronts and tend to result in an ageostrophic secondary circulation at the northwestern edge of the eddy. The upward component of the ageostrophic secondary circulation can enhance the nutrient flux into the euphotic layer, thereby increasing phytoplankton productivity. Anticyclonic eddy induced ageostrophic secondary circulation appears to be an important mechanism for increasing phytoplankton productivity in the oligotrophic waters of the South China Sea.
部门归属[Liu, Fenfen; Yin, Kedong] Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Guangdong, Peoples R China; [Tang, Shilin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Fenfen; Yin, Kedong] Key Lab Marine Resources & Coastal Engn Guangdong, Guangzhou 510006, Guangdong, Peoples R China; [Huang, Rui Xin] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA
关键词Phytoplankton Anticyclonic Eddy Asymmetric Distribution Western South China Sea
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16427
专题热带海洋环境国家重点实验室(LTO)
通讯作者yinkd@mail.sysu.edu.cn
推荐引用方式
GB/T 7714
Liu, FF,Tang, SL,Huang, RX,et al. The asymmetric distribution of phytoplankton in anticyclonic eddies in the western South China Sea[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2017,120:29-38.
APA Liu, FF,Tang, SL,Huang, RX,Yin, KD,&yinkd@mail.sysu.edu.cn.(2017).The asymmetric distribution of phytoplankton in anticyclonic eddies in the western South China Sea.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,120,29-38.
MLA Liu, FF,et al."The asymmetric distribution of phytoplankton in anticyclonic eddies in the western South China Sea".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 120(2017):29-38.
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