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GAO Jingsong,SHI Maochong,CHEN Bo,GUO Peifang,ZHAO Dongliang. 2014. Responses of the circulation and water mass in the Beibu Gulf to the seasonal forcing regimes. Acta Oceanologica Sinica, 33(7):1-11
Responses of the circulation and water mass in the Beibu Gulf to the seasonal forcing regimes
北部湾的环流和水团对季节性强迫的响应
Received:January 13, 2013  Revised:January 07, 2014
DOI:10.1007/s13131-014-0506-6
Key words:Princeton ocean model (POM)  Beibu Gulf (Gulf of Tonkin)  circulation  cold water mass  response
中文关键词:  数值模型  北部湾  环流  冷水团  响应
基金项目:The Guangxi Natural Science Foundation under contract No. 2012GXNSFEA053001;the program of “The Beibu Gulf forecast circulation system construction and its application to the coastal pollution transport”.
Author NameAffiliationE-mail
GAO Jingsong Ocean University of China, Qingdao 266003, China
Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences, Nanning 530007, China 
Jingsonggao8412@gmail.com 
SHI Maochong Ocean University of China, Qingdao 266003, China  
CHEN Bo Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences, Nanning 530007, China  
GUO Peifang Ocean University of China, Qingdao 266003, China  
ZHAO Dongliang Ocean University of China, Qingdao 266003, China  
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Abstract:
      In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baroclinic model that was verified by observations, the formation mechanisms were revealed: the circulation in the northern Beibu Gulf was triggered by the monsoon wind throughout a year;whereas the southern gulf circulation was driven by the monsoon wind and South China Sea (SCS) circulation in winter and summer, respectively. The force of heat flux and tidal harmonics had a strong effect on the circulation strength and range, as well as the local circulation structures, but these factors did not influence the major circulation structure in the Beibu Gulf. On the other hand, the Beibu Gulf Cold Water Mass (BGCWM) would disappear without the force of heat flux because the seasonal thermocline layer was generated by the input of heat so that the vertical mixing between the upper hot water and lower cold water was blocked. In addition, the wind-induced cyclonic gyre in the northern gulf was favorable to the existence of the BGCWM. However, the coverage area of the BGCWM was increased slightly without the force of the tidal harmonics. When the model was driven by the monthly averaged surface forcing, the circulation structure was changed to some extent, and the coverage area of the BGCWM almost extended outwards 100%, implying the circulation and water mass in the Beibu Gulf had strong responses to the temporal resolution of the surface forces.
中文摘要:
      In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baroclinic model that was verified by observations, the formation mechanisms were revealed: the circulation in the northern Beibu Gulf was triggered by the monsoon wind throughout a year;whereas the southern gulf circulation was driven by the monsoon wind and South China Sea (SCS) circulation in winter and summer, respectively. The force of heat flux and tidal harmonics had a strong effect on the circulation strength and range, as well as the local circulation structures, but these factors did not influence the major circulation structure in the Beibu Gulf. On the other hand, the Beibu Gulf Cold Water Mass (BGCWM) would disappear without the force of heat flux because the seasonal thermocline layer was generated by the input of heat so that the vertical mixing between the upper hot water and lower cold water was blocked. In addition, the wind-induced cyclonic gyre in the northern gulf was favorable to the existence of the BGCWM. However, the coverage area of the BGCWM was increased slightly without the force of the tidal harmonics. When the model was driven by the monthly averaged surface forcing, the circulation structure was changed to some extent, and the coverage area of the BGCWM almost extended outwards 100%, implying the circulation and water mass in the Beibu Gulf had strong responses to the temporal resolution of the surface forces.
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