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Advances in Earth Science >

2023 , Vol. 38 >Issue 2: 183 - 191

DOI: https://doi.org/10.11867/j.issn.1001-8166.2023.002

Characteristics of Marine Ecological Factors During Red Tide Periods in 2019 in Wenzhou Bay

  • Jingui LIU ,
  • Zhumei CHE ,
  • Shanglu LI ,
  • Tianyu ZHANG
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  • 1.College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang Guangdong 524088, China
    2.Marine Monitoring & Forecasting Center of Zhejiang Province, Hangzhou 310007, China
    3.Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing 100081, China
    4.Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang Guangdong 524088, China
LIU Jingui (1981-), male, Jingchuan County, Gansu Province, Associate professor. Research areas include estuarine and coastal dynamics, marine ecological environmental numerical simulations. E-mail: jinguiliu1981@hotmail.com
ZHANG Tianyu (1974-), male, Linyi City, Shandong Province, Professor. Research areas include marine environmental forecasting and monitoring, marine disaster mitigation. E-mail: zhaangty@sina.com

Received date: 2022-11-02

  Revised date: 2022-12-26

  Online published: 2023-03-02

Supported by

Program for Scientific Research Start-up Funds of Guangdong Ocean University “Nutrients cycling processes in tropical bay: a case study of the Zhanjiang Bay”(060302032202);“Numerical simulation system of typhoon storm surge in South China Sea”(060302032106)

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Abstract

In recent years, red tides have posed severe threats to local economic development and ecological safety. Using real-time monitoring data from the Biogeochemical Argo from April to June 2019, we investigated the changes in the main ecological factors during red tide periods. The results led to the following conclusions: ① Water temperature began to increase from early spring and rose to about 20 °C in early May. Owing to the impact of river discharge and tidal current, surface salinity presents obvious daily fluctuations with a range of 22~31 PSU, which evidently decreases due to flooding. ② Dissolved Inorganic Nitrogen (DIN) and active phosphate are controlled by hydrodynamics prior to occurrence, whereas they are influenced mainly by algal growth and the supply of meteorological-scale flooding post occurrence. ③ Nutrients and sea temperature are determined as key factors through Principal Component Analysis (PCA). Lastly, the variation in the ratio of N∶P and Dissolved Oxygen (DO) was further analyzed, and we proposed that the two chemical indices can be referred to as warning indices of red tide occurrence in Wenzhou Bay. This study will help build a linkage between red tides and hydrology and ecological factors, in support of forecasts and early warning of red tides.

Key words： Wenzhou Bay; Nutrients; Biogeochemical Argo; Red tides; Monitor warning

Cite this article

Jingui LIU , Zhumei CHE , Shanglu LI , Tianyu ZHANG . Characteristics of Marine Ecological Factors During Red Tide Periods in 2019 in Wenzhou Bay[J]. Advances in Earth Science, 2023 , 38(2) : 183 -191 . DOI: 10.11867/j.issn.1001-8166.2023.002

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