Counter-Wind Deep Current in the Northern Beibu Gulf in Boreal Winter
Counter-Wind Deep Current in the Northern Beibu Gulf in Boreal Winter
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北寒冬北部湾北部逆风深流
DOI：
10.1007/s11802-019-3711-2
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发表时间：
2019-02
影响因子：
1.6
通讯作者：
Shi Maochong
中科院分区：
文献类型：
--
作者：
Gao Jingsong;Wu Guidan;Kim Cuong Nguyen;Shi Maochong
北部湾地理位置重要，天然气、石油和生物资源丰富。观测到的海流表明，北部湾北部冬季上层与下层海流相反，下层为东北向。在本研究中，这种东北向气流由 3D 斜压模型再现。研究发现，9月至11月逆风深流（以下简称“CWDC”）增强，12月至次年2月减弱。北部湾北部存在垂直方向的闭合经向环流，包括CWDC、表层西南流、上升流和下降流。经向环流的时间变化过程与CWDC类似，11月和12月的强度和幅度均强于其他4个月。与CWDC的变化过程类似，季风从9月份的弱东风转变为11月和12月的强东北风，2月份又转变为弱东南风。敏感实验表明，CWDC 和经向环流受季风控制，并分别受到热通量和潮汐引起的混合的调节。根据动量平衡方程可以看出，逆风深流是由科里奥利力、垂直扩散和斜压梯度平衡的表面高程梯度引起的补偿流。
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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DOI：
--
发表时间：
1956
期刊：
--
影响因子：
--
作者：
W. Dale
通讯作者：
W. Dale
影响因子：
3.6
作者：
Gan, Jianping;Li, H.;Haidvogel, D. B.
通讯作者：
Haidvogel, D. B.
影响因子：
2.3
作者：
Jingsong Gao;H. Xue;F. Chai;M. Shi
通讯作者：
Jingsong Gao;H. Xue;F. Chai;M. Shi
影响因子：
1.4
作者：
Jingsong Gao;M. Shi;Bo Chen;Peifang Guo;D. Zhao
通讯作者：
Jingsong Gao;M. Shi;Bo Chen;Peifang Guo;D. Zhao
影响因子：
--
作者：
Dexing Wu;Yue Wang;Xiaopei Lin;Jiayan Yang
通讯作者：
Dexing Wu;Yue Wang;Xiaopei Lin;Jiayan Yang