【摘要】 本文采用σ-p混合坐标系,根据非绝热和地形影响下的热成风适应原理,探讨了暖性西南低涡生成的机制。分析表明:正的非热成风涡度是低涡生成的一个重要指标;对流层中低层的暖平流中心,地面的可感加热,低层的暖空气与场面气压p~*的负变压中心配合,或与它的负平流中心相配合,将产生正的非热成风涡度;场面气压的梯度(?)p~*,高低压中心的空间分布(?)~2p~*,场面气压的变压(?)p~*/(?)t和平流(-(?)_h·(?)p_*)等都与垂直运动直接有关。地形还影响热成风适应特征尺度(或变形半径)L~o。在一般条件下,地形和潜热的作用使L_o比不考虑两者作用时的L_o变小,易使L>L_o条件满足,更有利于流场向温度场适应。更多还原

【Abstract】 According to the thermal wind adjustment theorem of non-adiabatic and topographic effect, using σ-p mixed coordinate system genesis mechanism of warm South-west Vortex of China is discussed in this paper. Analysis shows, positive non-thermal wind is an important symbol for the vortex growing up. Warm advection center of lower-middle troposphere, surface sensible heat and warm air of lower troposphere, correlative with negative change pressure of surface pressure p* or with center of its negative advection, would cause the growing up of positive non-thermal wind vortex. Gradient p* of surface pressure, spatial distribution 2p* of lower-high pressure center, change pressure p*/ t and advection ( - Vh z· p* ) of surface pressure et al. are all correlated with vortical motion directly.The topography effects the characteristic scale L0 ( or radius of change form ) of adjustment process of warm wind. Under general condition, the effects of topography and latent heat make L0 smaller than L0* without considering them, velocity field adjusting toward temperature field, therefore L>L0 is satisfied easily.更多还原