风应力对热带斜压海洋的强迫

The Wind Stress Force upon the Tropical Baroclinic Ocean

利用一个线性的具有不同密度、温度的热带海洋两层模式,分析了热带西太平洋对纬圈风应力的响应。解析地求得热带西太平洋温跃层厚度、洋流及海温分布。结果表明次表层温度变化明显要比表层海温变化大,同时在大洋西部次表层发展起来的扰动向东传播能引起海温分布形态的异常。理论结果支持观测己表明的热带西太平洋物理量的变异在ElNino/La Nina事件中起着重要作用的事实。

The response of the western tropical Pacific to zonal wind stress is analyzed based on a linearly two-layer oceanic model with different density and temperature in surface and sub-surface layer, and the distribution of thermocline depth, current velocity and sea temperature of different layers are calculated. Results show that the temperature disturbance developed in the sub-surface layer travels eastward in the form of Kelvin waves, and so do other variables. The changeable amplitude of sub-surface temperatures is greater than that of surface, which accords with the fact that the anomaly of the physical fields in the western tropical Pacific plays an important role in El Nino and La Nina events.