Journal of Marine Sciences ›› 2021, Vol. 39 ›› Issue (4): 73-81.DOI: 10.3969/j.issn.1001-909X.2021.04.007

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Impacts of summer floods on the distribution and source of particulate organic carbon in the Changjiang (Yangtze River) Estuary and its adjacent sea area

  

  1. 1.Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China; 
    2.Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012,China; 
    3.Guangxi  Key Laboratory of Beibu Gulf Marine Resources, Environment and Sustainable Development, Beihai  536000, China; 
    4.Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai 536000, China; 
    5.Observation and Research Station of Yangtze River Delta Marine Ecosystems, Ministry of Natural Resources, Zhoushan 316021, China; 
    6.Polar and Marine Research Institute, Jimei University, Xiamen 361000, China
  • Online:2021-12-15 Published:2022-01-25

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Abstract: Abstract: The impact of the flood event on the distribution and source of particulate organic carbon(POC) in Changjiang (Yangtze River) Estuary and adjacent waters was analyzed based on the data of temperature, salinity, total suspended matter(TSM), POC and δ13CPOC ,which were collected during the July 2020 flood. The results show that POC is negatively correlated with salinity (r2=0.41, p＜0.01), and positively correlated with TSM (r2 =0.92, p＜0.01). The mixing of salt and fresh water is an important factor affecting the distribution of POC. The distribution of δ13CPOC values in the surface water indicates that the phytoplankton production is another important factor affecting the distribution of POC in the northeastern part of the study area. Flood events reduce the concentration of terrigenous POC due to the dilution of high runoff, meanwhile, light δ13CPOC values in the southeastern part of the study area indicate that flood events could expand the influence range of terrigenous POC in the East China Sea.


Key words: Changjiang (Yangtze River) Estuary, particulate organic carbon, δ13CPOC, flood

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