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Seasonal variations in the water residence time in the Bohai Sea using 3D hydrodynamic model study and the adjoint method

机译：渤海水中停留时间的季节变化使用3D流体动力模型研究和伴随方法

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摘要

The Bohai Sea is a large, semi-enclosed bay of China with a transport timescale of more than 1 year. Residence time (RT) is an important indicator used to determine the water exchange rate of coastal oceans, and it has a significant influence on coastal ecosystems and the environment. In this study, the RT and its seasonal variability within the Bohai Sea were investigated using a 3-D hydrodynamic model and the adjoint method of the RT. The model results show that the annual mean RT in the Bohai Sea is 3.43 years, and the RT increases from the Bohai Strait to the northwestern coast. The seasonal variability of the RT averaged over the entire Bohai Sea is not obvious; however, the regional RT has a significant seasonal variation, which could be more than 290% on average. When the monsoon winds were removed from the model, the sensitivity experiment showed an annual mean RT increase of ~ 90% with negligible seasonal variations in most areas of the Bohai Sea. The wind-induced residual current controls the seasonal variation in ocean circulation and induces the seasonal variability in RT; thus, monsoon winds play a dominant role in the seasonal variations of the water exchange rate in the Bohai Sea. Sensitivity experiments also suggest that tides can slow the water exchange rate, whereas the baroclinic processes and river runoff can accelerate the water exchange rate in the region near the Yellow River estuary. This study highlights the critical role of monsoon winds in affecting seasonal variabilities in the coastal transport timescale and exchange rate.
机译：渤海是一个大型半封闭的中国湾，运输时间为1年以上。停留时间（RT）是用于确定沿海海洋水汇率的重要指标，对沿海生态系统和环境产生重大影响。在本研究中，使用3-D流体动力学模型和RT的伴随方法研究了渤海内的RT及其季节变异性。模型结果表明，渤海的年平均调节是3.43岁，RT从渤海海峡到西北海岸增加。在整个渤海的RT的季节性变化并不明显;但是，区域RT具有显着的季节性变化，平均可能超过290％。当从模型中除去季风风时，敏感性实验表明，渤海大多数地区的季节性变化率为〜90％的年度平均值。风力诱导的残余电流控制海洋循环中的季节变化，并在室温下诱导季节变异性;因此，季风风在渤海水汇率的季节变化中发挥着主导作用。敏感性实验还表明，潮汐可以减缓水汇率，而曲金过程和河流径流可以加速黄河口附近该地区的水汇率。本研究突出了季风风在沿海运通季度和汇率影响季节性变量的关键作用。

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  • 来源
    《Ocean Dynamics》 |2021年第2期|157-173|共17页
  • 作者

    Chongxin Luo; Lei Lin; Jie Shi; Zhe Liu; Zhongya Cai; Xinyu Guo; Huiwang Gao;

  • 作者单位

    Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China 238 Songling Road Qingdao 266100 China;

    College of Ocean Science and Engineering Shandong University of Science and Technology Qingdao 266590 China;

    Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China 238 Songling Road Qingdao 266100 China;

    Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China 238 Songling Road Qingdao 266100 China Present address: Department of Earth Sciences National Natural Science Foundation of China Beijing China;

    State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of Macau Macau China;

    Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China 238 Songling Road Qingdao 266100 China Center for Marine Environmental Studies Ehime University 2-5 Bunkyo-Cho Matsuyama 790-8577 Japan;

    Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China 238 Songling Road Qingdao 266100 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Residence time; Seasonal variation; Monsoon winds; Adjoint method; Bohai Sea;

    机译：停留时间;季节性变化;季风风;伴随方法;渤海;

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