大气层结对冷锋环流的影响

利用原始方程模式讨论了不同大气层结对冷锋环流的影响及其在激发锋区中尺度强对流系统中的作用，结果表明：层结对锋区环流有非常大的影响，随层结稳定度的减小，锋区非地转越锋环流和上升运动迅速增强，锋前暖区有可能产生中尺度强对流和多重中尺度上升运动带，并有利于对称不稳定的激发；层结对冷锋环流的影响和锋区中尺度强对流系统形成的作用主要由中低层的大气层结状态决定

INFLUENCES OF STRATIFICATION ON COLD-FRONTAL CIRCULATION

The effects of stratification on variation of cold frontal circulation and formation of severe mesoscale convection in the frontal zone are studied by using the primitive equation model,the results show that the variation of stratification has very important influences on the frontal circulation,with the decreasing of the static stability the cross frontal ageostrophic circulation and upward motion are enhanced rapidly,and the posibility in producing mesoscale severe convection and multiple rainbands ahead of the front is also increased,and it is advantageous to excite symmetric instability in frontal zone,however,the effects of stratification on cold frontal circulation and formation of mesoscale severe convective system are mainly determined by stratified states in the lower atmosphere.