CAJ | 학술논문

从含非绝热项的准地转运动方程组出发,分析了青藏高原大尺度热力作用下非绝热Rossby波的一些性质.从理论上证明当背景西风气流为正压时,冬季高原冷却作用有利于Rossby波的经向传播.又由非绝热Rossby波的频率方程说明冬季高原的热力作用是中高纬季节内振荡的重要激发机制.此外,当背景西风气流为斜压时,求解了高原热力作用下非绝热Rossby波的频率,并由频率方程说明冬季高原冷却作用有利于波动向不稳定方向发展,而夏季高原的大尺度热力作用对波动稳定性的影响存在临界值.
종함비절열항적준지전운동방정조출발,분석료청장고원대척도열력작용하비절열Rossby파적일사성질.종이론상증명당배경서풍기류위정압시,동계고원냉각작용유리우Rossby파적경향전파.우유비절열Rossby파적빈솔방정설명동계고원적열력작용시중고위계절내진탕적중요격발궤제.차외,당배경서풍기류위사압시,구해료고원열력작용하비절열Rossby파적빈솔,병유빈솔방정설명동계고원냉각작용유리우파동향불은정방향발전,이하계고원적대척도열력작용대파동은정성적영향존재림계치.
From the diabatic quasi-geostrophic equations of motion, the authors analyze the characteristics ofdiabatic Rossby waves including the thermal effects of the Tibetan Plateau. When the basic zonal flow isbarotropic, it is demonstrated that the cooling of the Tibetan Plateau in winter not only facilitates themeridional propagation of Rossby waves but is an important driving mechanism of the intraseasonaloscillations in middle and high latitudes. When the basic zonal flow is baroclinic, it is found that the coolingof the Tibetan Plateau in winter facilitates the instability of Rossby waves, while in summer there is athreshold for the influence of the heating of the Tibetan Plateau on the stability of Rossby waves.