Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary

doi:10.2112/07-0948.1

	Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary
	Pei, Shaofeng 1,2; Shen, Zhiliang 1; Laws, Edward A.3
	2009-05-01
发表期刊	JOURNAL OF COASTAL RESEARCH
ISSN	0749-0208
卷号	25 期号:3 页码:569-580
文章类型	Article
摘要	Nutrient dynamics and its influence on the distribution of chlorophyll-a in the upwelling area of the Changjiang (Yangtze) River estuary were investigated in the spring (May) and summer (August) of 2004. In the spring, upwelling was apparent in the region of 122 degrees 20'-123 degrees 00' E, 31 degrees 00'-32 degrees 00' N and was associated with low temperature (16-21 degrees C), high salinity (24-33 practical salinity units [psu]), and low dissolved oxygen (2.5-6.0 mg L(-1)) in the upper 10 m of the water column. The spring upwelling increased the mixed-layer phosphate, nitrate, and silicate concentrations to roughly 1, 15, and 15 mu mol L(-1), respectively, and improved the light transparency in the euphotic zone. This improvement in phytoplankton growing conditions was followed by an increase in chlorophyll-a concentrations. The summer upwelling was weaker and occurred over a smaller geographical area (122 degrees 20'-123 degrees 00' E, 31 degrees 15'-31 degrees 50' N). Strongly influenced by turbid Changjiang diluted water (CDW), it had little impact on the upper 10 m of the water column but instead increased nutrient concentrations at greater depths. The high concentration of particulates in the CDW reduced light transmission in the upper 10 m and, hence, limited phytoplankton growth throughout the water column. Chlorophyll-a concentrations in the summer upwelling area were roughly an order of magnitude lower than in the spring. Water clarity, as influenced by the CDW, appears to be the principal factor limiting the impact of upwelling on phytoplankton biomass in this area.; Nutrient dynamics and its influence on the distribution of chlorophyll-a in the upwelling area of the Changjiang (Yangtze) River estuary were investigated in the spring (May) and summer (August) of 2004. In the spring, upwelling was apparent in the region of 122 degrees 20'-123 degrees 00' E, 31 degrees 00'-32 degrees 00' N and was associated with low temperature (16-21 degrees C), high salinity (24-33 practical salinity units [psu]), and low dissolved oxygen (2.5-6.0 mg L-1) in the upper 10 m of the water column. The spring upwelling increased the mixed-layer phosphate, nitrate, and silicate concentrations to roughly 1, 15, and 15 mu mol L-1, respectively, and improved the light transparency in the euphotic zone. This improvement in phytoplankton growing conditions was followed by an increase in chlorophyll-a concentrations. The summer upwelling was weaker and occurred over a smaller geographical area (122 degrees 20'-123 degrees 00' E, 31 degrees 15'-31 degrees 50' N). Strongly influenced by turbid Changjiang diluted water (CDW), it had little impact on the upper 10 m of the water column but instead increased nutrient concentrations at greater depths. The high concentration of particulates in the CDW reduced light transmission in the upper 10 m and, hence, limited phytoplankton growth throughout the water column. Chlorophyll-a concentrations in the summer upwelling area were roughly an order of magnitude lower than in the spring. Water clarity, as influenced by the CDW, appears to be the principal factor limiting the impact of upwelling on phytoplankton biomass in this area.
关键词	Phosphate Nitrate Silicate Chlorophyll Transparency Phytoplankton
学科领域	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
DOI	10.2112/07-0948.1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000266182300004
引用统计	被引频次：34[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2628
专题	海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Shandong, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.Louisiana State Univ, Sch Coast & Environm, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Pei, Shaofeng,Shen, Zhiliang,Laws, Edward A.. Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary[J]. JOURNAL OF COASTAL RESEARCH,2009,25(3):569-580.
APA	Pei, Shaofeng,Shen, Zhiliang,&Laws, Edward A..(2009).Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary.JOURNAL OF COASTAL RESEARCH,25(3),569-580.
MLA	Pei, Shaofeng,et al."Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary".JOURNAL OF COASTAL RESEARCH 25.3(2009):569-580.

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