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Nutrient Dynamics of the Upwelling Area in the Changjiang Estuary

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Book cover Studies of the Biogeochemistry of Typical Estuaries and Bays in China

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Abstract

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. The spring upwelling was apparent in the region of 122°20′–123°00′ E, 31°00′–32°00′ N and was associated with low temperature (16–21 °C), high salinity (24–33), 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 µmol 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°20′–123°00′ E, 31°15′–31°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.

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Authors and Affiliations

  1. Key Laboratory of Marine Ecology and Environmental Sciences, Center for Ocean Mega-Science and Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Zhiliang Shen

  2. Key Laboratory of Coastal Wetlands, China Geological Survey, Qingdao Institute of Marine Geology, Ministry of Land & Resources, Qingdao, 266071, China

    Shaofeng Pei

  3. Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, Baton Rouge, 70803, USA

    Edward A. Laws

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  1. Shaofeng Pei
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  2. Zhiliang Shen
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  3. Edward A. Laws
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Correspondence to Zhiliang Shen .

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  1. Center for Ocean Mega-Science, Chinese Academy of Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China

    Zhiliang Shen

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Pei, S., Shen, Z., Laws, E.A. (2020). Nutrient Dynamics of the Upwelling Area in the Changjiang Estuary. In: Shen, Z. (eds) Studies of the Biogeochemistry of Typical Estuaries and Bays in China. Springer Earth System Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-58169-8_6

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