The numerical investigation of seasonal variation of the cold water mass in the Beibu Gulf and its mechanisms

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• 作者：Zhenhua Chen (1) (2) (3)
  Fangli Qiao (2) (3)
  Changshui Xia (2) (3)
  Gang Wang (2) (3)
  
  1. College of Physical and Environmental Oceanography ; Ocean University of China ; Qingdao ; 266100 ; China
  2. The First Institute of Oceanography ; State Oceanic Administration ; Qingdao ; 266061 ; China
  3. Key Laboratory of Marine Science and Numerical Modeling (MASNUM) ; State Oceanic Administration ; Qingdao ; 266061 ; China
  
• 关键词：Beibu Gulf ; cold water mass ; seasonal variation ; wave ; tide ; circulation coupled model
• 刊名：Acta Oceanologica Sinica
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：34
• 期：1
• 页码：44-54
• 全文大小：3,105 KB
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• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

A wave-tide-circulation coupled model based on the Princeton Ocean Model is established to explore the seasonal variation of the cold water mass in the Beibu Gulf and its mechanisms. The results show that the cold water mass starts forming in March, reaches the maximum strength during June and July, and fades away since October. Strong mixing in winter transports the cold water from sea surface to bottom. The cold water mass remains in the bottom layer as the thermocline strengthens during spring, except for the shallow water where the themocline is broken by strong tidal mixing, which gradually separate the cold water mass from its surrounding warm water. Further analysis on the ocean current and stream function confirms that the cold water mass in the Beibu Gulf is locally developed, with an anticlockwise circulation caused by a strong temperature gradient. Sensitivity experiments reveal that the cold water mass is controlled by the sea surface heat flux, while the terrain and tidal mixing also play important roles.