海洋学研究 ›› 2021, Vol. 39 ›› Issue (4): 73-81.DOI: 10.3969/j.issn.1001-909X.2021.04.007

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夏季洪水对长江口及邻近海域颗粒有机碳分布与来源的影响

  

  1. 1.自然资源部海洋生态系统动力学重点实验室，浙江 杭州 310012； 
    2.自然资源部第二海洋研究所，浙江 杭州  310012； 
    3.广西北部湾海洋资源环境与可持续发展重点实验室，广西 北海 536000； 
    4.自然资源部第四海洋研究所, 广西 北海 536000； 
    5.自然资源部长三角海洋生态环境野外科学观测研究站, 浙江 舟山 316021； 
    6.集美大学极地与海洋研究院，福建 厦门 361000)
  • 出版日期:2021-12-15 发布日期:2022-01-25
  • 通讯作者: 金海燕(1974-),女,研究员,主要从事海洋生物地球化学方面的研究
  • 作者简介:罗颖(1995-),女,江西省鹰潭市人,主要从事海洋生物地球化学方面的研究,Email:lnstyle7@163.com。
  • 基金资助:
    全球变化与海气相互作用”专项二期任务(长江口缺氧酸化预警监测);中央级公益性科研院所基本科研业务费专项资金资助项目(SZ2001);浙江省自然科学基金(Y19D060024,LQ18D060003); 国家自然科学基金浙江两化融合联合基金(U1709201);国家自然科学基金(41806095,41706120)

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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摘要： 基于2020年7月洪水期间采集的长江口及邻近海域的温度、盐度、总悬浮物(Total Suspended Matter，TSM)质量浓度、颗粒有机碳(Particulate Organic Carbon，POC)质量浓度和颗粒有机碳稳定同位素(δ13CPOC)等数据，分析了洪水事件对该区域POC分布与来源的影响。结果显示，研究区域内POC和盐度呈显著负相关(r2=0.41，p＜0.01)，与TSM呈显著正相关(r2=0.92，p＜0.01)，表明咸淡水的混合是影响POC分布的重要因素。研究区域东北部表层海水POC质量浓度局部升高，并且δ13CPOC值显示为海源信号，表明浮游植物生产是影响该海域POC分布的另一重要因素。此外，由于高径流量形成的稀释效应，洪水事件会降低陆源输入的POC质量浓度，研究区域东南侧偏轻的δ13CPOC也表明，洪水事件会扩大陆源POC在东海的影响范围。

关键词: 长江口, 颗粒有机碳, δ13CPOC, 洪水

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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