Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River

CORC > 厦门大学 > 海洋环境－已发表论文

	Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River
	Tseng, Y-F. ; Lin, J. ; Dai, M. ; Kao, S-J. ; Dai MH(戴民汉) ; Gao SJ(高树基)
刊名	http://dx.doi.org/10.5194/bg-11-409-2014
	2014
关键词	EAST-CHINA-SEA ALKALINE-PHOSPHATASE ACTIVITY YANGTZE-RIVER SPATIAL-DISTRIBUTION PHOSPHORUS STRESS MEDITERRANEAN-SEA NUTRIENT DYNAMICS KUROSHIO WATERS CHLOROPHYLL-A YELLOW SEA
英文摘要	National Science Council of Taiwan; National Natural Science Foundation of China; The Changjiang (Yangtze) River discharges vast amount of unbalanced nutrients (dissolved inorganic nitrogen and phosphorus with N/P ratio >80 in general) into the East China Sea in summer. To study nutrient dynamics and P-stress potential for phytoplankton, a cruise was conducted in the Changjiang plume during summer 2011. With 3-D observations of nutrients, chlorophyll a (Chl a), and bulk alkaline phosphatase activity (APA), we concluded that the Changjiang Diluted Water and coastal upwelling significantly influenced the horizontal and vertical heterogeneities of phytoplankton P deficiency in the Changjiang plume. Allochthonous APA was detected at nutrient-enriched freshwater end. Excessive N (similar to 10 to 112 mu M) was observed throughout the entire plume surface. In the plume fringe featuring stratification and excess N, diapycnal phosphate supply was blocked and phytoplankton APA was stimulated for growth. We observed an upwelling just attaching to the turbidity front at seaward side where Chl a peaked yet much less APA was detected. An external phosphate supply from subsurface, which promoted phytoplankton growth but inhibited APA, was suggested to be sourced from the Nearshore Kuroshio Branch Current. In the so hydrographically complicated Changjiang plume, phosphate supply instead of its concentration may be more important in determining the expression of APA. Meanwhile, allochthonous APA may also alter the usefulness of APA as a P-stress indicator.
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88200]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Tseng, Y-F.,Lin, J.,Dai, M.,et al. Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River[J]. http://dx.doi.org/10.5194/bg-11-409-2014,2014.
APA	Tseng, Y-F.,Lin, J.,Dai, M.,Kao, S-J.,戴民汉,&高树基.(2014).Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River.http://dx.doi.org/10.5194/bg-11-409-2014.
MLA	Tseng, Y-F.,et al."Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River".http://dx.doi.org/10.5194/bg-11-409-2014 (2014).