| YU Yi,LIU Hailong,LAN Jian. 2016. The influence of explicit tidal forcing in a climate ocean circulation model. Acta Oceanologica Sinica, 35(9):42－50 |
| The influence of explicit tidal forcing in a climate ocean circulation model |
| 引潮力对海洋环流模式的影响 |
| Received:October 07, 2015 Revised:December 23, 2015 |
| DOI：10.1007/s13131-016-0931-9 |
| Key words:tidal forcing tidal mixing ocean general circulation model wind-driven circulation Atlantic meridional overturning circulation |
| 中文关键词: 引潮力 潮汐混合 海洋环流模式 风生环流 大西洋经向翻转环流 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | YU Yi | Physical Oceanography Laboratory, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266003, China | | | LIU Hailong | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | lhl@lasg.iap.ac.cn | | LAN Jian | Physical Oceanography Laboratory, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266003, China | |
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| Abstract: |
| The eight main tidal constituents have been implemented in the global ocean general circulation model with approximate 1° horizontal resolution. Compared with the observation data, the patterns of the tidal amplitudes and phases had been simulated fairly well. The responses of mean circulation, temperature and salinity are further investigated in the global sense. When implementing the tidal forcing, wind-driven circulations are reduced, especially those in coastal regions. It is also found that the upper cell transport of the Atlantic meridional overturning circulation (AMOC) reduces significantly, while its deep cell transport is slightly enhanced from 9×106 m3/s to 10×106 m3/s. The changes of circulations are all related to the increase of a bottom friction and a vertical viscosity due to the tidal forcing. The temperature and salinity of the model are also significantly affected by the tidal forcing through the enhanced bottom friction, mixing and the changes in mean circulation. The largest changes occur in the coastal regions, where the water is cooled and freshened. In the open ocean, the changes are divided into three layers:cooled and freshened on the surface and below 3 000 m, and warmed and salted in the middle in the open ocean. In the upper two layers, the changes are mainly caused by the enhanced mixing, as warm and salty water sinks and cold and fresh water rises; whereas in the deep layer, the enhancement of the deep overturning circulation accounts for the cold and fresh changes in the deep ocean. |
| 中文摘要: |
| 在一个水平分辨率为1度的海洋环流模式中加入八大主要潮汐分潮。与观测数据对比，海洋模式能很好的模拟潮汐的振幅和迟角。我们进一步在全球尺度上研究平均环流，温度，盐度对潮汐的响应。当加入潮汐之后，风生环流有明显的减弱，尤其是在近海区域。同时，大西洋经向翻转环流的上层流量有明显的减弱。然而，大西洋经向翻转环流的深层环流流量由9×106m3/s增加到10×106m3/s。环流减弱的原因可能是由于加入潮汐导致底层摩擦和垂直粘性增强造成的。由于底摩擦和混合的增强以及环流的改变，海温和盐度也明显的受到潮汐的影响。最大的变化发生在近海区域，此处的海水变冷变淡。在开阔大洋，海温和盐度的变化分为三层：变冷变淡的海水出现在表层和3000m以深，暖而咸的海水出现在中层。海水在上面两层的变化主要是由于垂直混合增强，暖而咸的海水下沉，冷而淡的海水上升造成的。然而在深海，由于底层翻转环流的增强，导致底层海水变的冷而淡。 |
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