| CHEN Zhenhua,QIAO Fangli,XIA Changshui,WANG Gang. 2015. The numerical investigation of seasonal variation of the cold water mass in the Beibu Gulf and its mechanisms. Acta Oceanologica Sinica, 34(1):44－54 |
| The numerical investigation of seasonal variation of the cold water mass in the Beibu Gulf and its mechanisms |
| 北部湾冷水团的季节变化及其机制的数值研究 |
| Received:May 26, 2014 Revised:August 11, 2014 |
| DOI：10.1007/s13131-015-0595-x |
| Key words:Beibu Gulf cold water mass seasonal variation wave-tide-circulation coupled model |
| 中文关键词: 北部湾 冷水团 季节变化 浪-潮-流耦合模式 |
| 基金项目:The National Natural Science Foundation of China under contract No. U1406404; the National Basic Research Program (973 Program) of China under contract No. 2014CB745004. |
| Author Name | Affiliation | E-mail | | CHEN Zhenhua | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China
The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling (MASNUM), State Oceanic Administration, Qingdao 266061, China | | | QIAO Fangli | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling (MASNUM), State Oceanic Administration, Qingdao 266061, China | qiaofl@fio.org.cn | | XIA Changshui | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling (MASNUM), State Oceanic Administration, Qingdao 266061, China | | | WANG Gang | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling (MASNUM), State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 基于普林斯顿海洋模式(POM), 建立了一个浪-潮-流耦合模式, 用于研究北部湾冷水团的季节变化及其机制. 模式结果显示: 北部湾冷水团于三月开始形成, 六月和七月成熟, 十月逐渐消退. 冬季表层冷却导致的强混合将表层冷水输运到底层储留, 春季表层升温使得温度跃层加强, 水深较浅处主要由于强潮混合难以形成跃层, 逐步将冷水团孤立出来. 流场和流函数显示冷水团是局地形成的. 春季和夏季冷水团周围都存在逆时针方向环流, 强的温度梯度是产生这一环流的主要原因. 敏感实验证明了表面热通量是冷水团形成的控制因子, 地形和潮混合对冷水团的形成起重要作用. |
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