The main phosphorous sources in the Changjiang estuary |
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| Authors: | Dongfang Yang Fan Wang Zhenqing Miao Yongli Chen Yuanzheng Tong |
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| Institution: | [1]Marine Science College, Zhediang Ocean University, Zhoushan 316000, China [2]Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China [3]State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Science, Beijing 100085,China |
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| Abstract: | Analysis using historical data on the phosphate sources in Changjiang (Yangtze River) estuary show that phosphate was supplied
equally from the east, south, west and north of the estuary. These sources include the Changjiang River, the Taiwan Warm Current
(TWC), a cyclone-type eddy, and the 32°N Upwelling, supplying different phosphates in different times, ways and intensities.
The magnitude of their supplying phosphate concentration was related with the size in the order of the Changjiang River <
the TWC < the 32°N Upwelling < the cyclone-type eddy, and the duration of the supplying was: the Changjiang River > the TWC
> the cyclone-type eddy > the 32°N Upwelling. The four sources supplied a great deal of phosphate so that the phosphate concentration
in the estuary was kept above 0.2 μmol/L in previous years, satisfying the phytoplankton growth. The horizontal and vertical
distribution of the phosphate concentration showed that near shallow marine areas at 122°E/31°N, the TWC in low nutrient concentration
became an upwelling through sea bottom and brought up nutrients from sea bottom to marine surface. In addition, horizontal
distribution of phosphate concentration was consistent with that of algae: Rhizosolenia robusta, Rhizosolenia calcaravis and Skeletonema, which showed that no matter during high water or low water of Changjiang River, these species brought by the TWC became
predominant species. Therefore, the authors believe that the TWC flowed from south to north along the coast and played a role
in deflecting the Changjiang River flow from the southern side.
Supported by Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, SOA, the Director’s Foundation
of the North Sea Monitoring Center, and Chinese Academy of Sciences (No. KZCX 2-207), and the Project of Ecological Environment
in Fishery and Technology Controlling Pollution in Zhoushan Fishing Ground (No. 2007c23075) |
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| Keywords: | Changjiang estuary phosphate sources Taiwan Warm Current cyclone-type eddy |
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