摘要
观测表明,控制对流流场演变的因素可分为二类:一类是环境因素,如浮力和环境风及其垂直分布;另一类是与对流发展有关的派生因素,如对流流场相对于水凝结物场的传播,以及云下气流在水平方向上存在着的某种间断等等。利用数值试验的方法,对各种因素在超级对流单体的流型形成中的作用作了一系列试验,试验表明,环境因素是原生性的,它们决定了对流场的雏型,而一些派生因素则影响着流场演变的倾向,两种因素作用的适当配合才有利于超级单体流型的形成。
The factors controling the evolution of convective air flow can be classified into two kinds. The ones are environmental factors such as buoyancy and wind shear; The others are derivative factors associated with convective development such as the interruption of horizontal velocity of air motion beneath the cloud base and the propagation of convective air flow field relative to hydrometeor. In order to explore the effects of these factors on the formation of supercell storm the numerical experiments have been done with two-dimensional model (TDHM).The results indicate that the environmetal factors are basic ones which determine the embryonic form of convective air flow pattern, the derivative factors affect the evolutional direction of air flow pattern. The proper coordination of both factors favour the formation of supercell.
出处
《高原气象》
CSCD
北大核心
1991年第2期217-224,共8页
Plateau Meteorology
关键词
气流
对流
数值试验
单体形成
Numerical experiment
Supercell formation
