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      Counter-Wind Deep Current in the Northern Beibu Gulf in Boreal Winter

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          The Beibu Gulf is at an important geographical location and rich in gas, oil and biological resources. The observed currents showed that the current in the upper layer was opposite to that in the lower layer in boreal winter in the northern Beibu Gulf and it was northeastward in the lower layer. This northeastward current was reproduced by a 3D baroclinic model in this study. It’s found that the counter-wind deep current (referred to as ‘CWDC’ hereinafter ) strengthened from September to November but weakened from December to the following February. A closed meridional circulation in vertical direction was found in the northern Beibu Gulf, including CWDC, surface southwestward current, an upwelling, and a downwelling. The temporal variation process of the meridional circulation was similar to that of CWDC, with strength and range stronger in November and December than in other four months. Similar to the variation process of CWDC, the monsoon wind changed from weak easterly wind in September to strong northeasterly wind in November and December, and it was transformed into weak southeasterly wind in February again. The sensitive experiments showed that CWDC and the meridional circulation were controlled by the monsoon wind and were adjusted by heat flux- and tide-induced mixing, respectively. According to the momentum balance equation, it can be revealed the counter-wind deep current is a compensation current which is induced by the surface elevation gradient balanced by the Coriolis force, vertical diffusion and baroclinic pressure gradient.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 January 2019
          01 February 2019
          : 18
          : 1
          : 57-68
          1 Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education Naning Normal University,, Nanning 530001, China
          2 Guangxi Coastal Key laboratory of Marine Environment Science, Guangxi Academy of Sciences, Nanning 530007, China
          3 Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Qinzhou University, Qinzhou 535011, China
          4 VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
          5 Ocean University of China, Qingdao 266100, China
          Author notes
          *Corresponding author: GAO Jingsong
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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