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Journal of Ocean University of China

, Volume 18, Issue 1, pp 57–68 | Cite as

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

  • Jingsong GaoEmail author
  • Guidan Wu
  • Kim-Cuong Nguyen
  • Maochong Shi
Article
  • 9 Downloads

Abstract

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.

Key words

Beibu Gulf numerical model (POM) counter-wind deep current (CWDC) monsoon wind momentum balance equation 

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Notes

Acknowledgements

This work is jointly supported by the National Natural Science Foundation of China (Nos. 41566001, 41406044 and 41576024), Guangxi Natural Science Foundation (Nos. 2015GXNSFCA139023, 2018JJD150011, 2016JJF15001 and 2015GXNSFAA139247), Guangxi Science and Technology Development Program (Guikegong 1598016-8), Guangxi Science and Technology Major Project (Guike AA18118025), Guangxi Science and Technology Development Program (Guikegong 1598016-8), Guangxi Key Research and Development Program (Guike AB16380282), Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Qinzhou University (No. 2017KF02) and the Fundamental Research Funds of Guangxi Academy of Sciences (No. 2017YJJ23005). This work is also supported by Vietnam State-Level Project KC09.14/16-20.

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Copyright information

© Science Press, Ocean University of China and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jingsong Gao
    • 1
    • 2
    • 3
    Email author
  • Guidan Wu
    • 1
  • Kim-Cuong Nguyen
    • 4
  • Maochong Shi
    • 5
  1. 1.Key Laboratory of Environment Change and Resources Use in Beibu GulfMinistry of Education Naning Normal UniversityNanningChina
  2. 2.Guangxi Coastal Key laboratory of Marine Environment ScienceGuangxi Academy of SciencesNanningChina
  3. 3.Guangxi Key Laboratory of Marine Disaster in the Beibu GulfQinzhou UniversityQinzhouChina
  4. 4.VNU University of ScienceHanoiVietnam
  5. 5.Ocean University of ChinaQingdaoChina

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