| 摘要: |
| 应用含有非绝热因子的正压模式方程组,着重分析了对流凝结加热、蒸发-风反馈和CISK机制等非绝热因子对低纬Rossby波和Kelvin波的影响。既获得了圆频率的表达式,又分析了波的周期与稳定性。结果表明:非绝热因子的存在不但扩大了绝热波的周期,而且改变了波的稳定性。因此,可以认为:所谓季节内振荡(30-60天的周期振荡)等低频振荡实际上是一类非绝热波,这类非绝热波是引起中长期天气变化及短期气候演变的重要因素。 |
| 关键词: 低频振荡 非绝热波动 正压模式 |
| DOI： |
| 分类号: |
| 基金项目:攀登项目“气候动力学和气候预测理论的研究”资助 |
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| THE DIABATIC WAVES IN BAROTROPIC MODEL |
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Huang Dachuan, Liu Shikuo
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Department of Geophysics, Beijing University, Beijing, 100871
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| Abstract: |
| A equatorial B-plane barotropic model is used to discuss the influence of the diabatic factors such as heating of condensation, evaporation-wind feedback and CISK on the Kelvin and Rossby waves. We have obtained the angular frequency and analyzed the period of waves and stability. It is shown that the existence of the diabatic factors enlarges not only the period of adiabatic waves changes but also the stability of waves. And we think that the so-called low-frequency oscillations are a kind of diabatic waves which are important factors producing the short-term climatic changes. |
| Key words: Low-frequency oscillation Diabatic waves Barotropic model |
