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

doi:10.2112/07-0948.1

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	Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary
	Pei, Shaofeng 1,2; Shen, Zhiliang 1; Laws, Edward A.3
刊名	JOURNAL OF COASTAL RESEARCH
	2009-05-01
卷号	25 期号:3 页码:569-580
关键词	Phosphate Nitrate Silicate Chlorophyll Transparency Phytoplankton
ISSN号	0749-0208
DOI	10.2112/07-0948.1
文献子类	Article
英文摘要	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.
学科主题	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
URL标识	查看原文
语种	英语
WOS记录号	WOS:000266182300004
公开日期	2010-12-22
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/2629]
专题	海洋研究所_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
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.