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Phytoplankton size structure in the western South China Sea under the influence of a 'jet-eddy system'
Liang, Wenzhao1,2; Tang, Danling1; Luo, Xin2
AbstractA northeastward jet in the western South China Sea (SCS) usually induces phytoplankton blooms during summertime. This jet is often sandwiched by a cyclonic eddy in the north and an anticyclonic eddy in the south. Using in situ and satellite data, the present study analyzes the combined impact of the northeastward jet and two eddies on the phytoplankton size structure (PSS) from August to September 2014. Generally, picophytoplankton is the major size fraction in surface water, contributing 73% of the total chlorophyll a concentration. The data showed that a high chlorophyll a belt (av. 0.29 +/- 0.18 mu g L-1) with a large percentage of microphytoplankton (av. 14%) appeared in the northeastward jet. Meanwhile, similar chlorophyll a concentrations were observed in the cyclonic (av. 0.072 +/- 0.019 mu g L-1) and anticyclonic eddies (av. 0.087 +/- 0.02 mu g L-1), but microphytoplankton contributed 6.7% more in the anticyclonic eddy. Below the surface, however, the dominant size of phytoplankton switched from pico to nano and micro with increasing depth. In contrast to the observations at the surface, the jet and anticyclonic eddy presented a lower microphytoplankton contribution than the cyclonic eddy. Horizontally, advection of coastal upwelling water by the northeastward jet enhanced the growth of phytoplankton and influenced the surface PSS. Meanwhile, divergence/convergence in cyclonic/anticyclonic eddy interaction with the northeastward jet formed the high chlorophyll a belt at the edge of the eddy and increased the microphytoplankton contribution through water mass transport and mixing. Nutrient supply and weakening of the light intensity below the surface layer synergistically influenced the concentration and size structure of phytoplankton in the cyclonic/anticyclonic eddies at different depths. Finally, this study proposed a jet-eddy system' to explain summer spatial characteristics of PSS in the western SCS. Source water (riverine and coastal upwelling water) that feeds the jet-eddy system' is another key factor affecting phytoplankton biomass and its size structure.
KeywordPhytoplankton size structure Coastal upwelling Jet Eddy River plume
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Key Lab Ocean Remote Sensing LORS, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Liang, Wenzhao,Tang, Danling,Luo, Xin. Phytoplankton size structure in the western South China Sea under the influence of a 'jet-eddy system'[J]. JOURNAL OF MARINE SYSTEMS,2018,187:82, 95.
APA Liang, Wenzhao,Tang, Danling,&Luo, Xin.(2018).Phytoplankton size structure in the western South China Sea under the influence of a 'jet-eddy system'.JOURNAL OF MARINE SYSTEMS,187,82.
MLA Liang, Wenzhao,et al."Phytoplankton size structure in the western South China Sea under the influence of a 'jet-eddy system'".JOURNAL OF MARINE SYSTEMS 187(2018):82.
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