呼和浩特市一次久旱转暴雨过程分析  

Analysis of the Process from Drought to rain in Hohhot

作　　者：赵翠珍 王晓云 

机构地区：[1]呼和浩特市气象局,内蒙古呼和浩特010020

出　　处：《内蒙古农业科技》2012年第4期83-86,共4页Inner Mongolia Agricultural Science and Technology

摘　　要：应用常规资料、T639数值预报产品资料和physic实况资料,对2011年8月14日呼和浩特市久旱转雨过程的环流演变及各种物理量场特征进行诊断分析。结果表明:干旱期呼和浩特市上空长期维持稳定的"西高东低"环流型;大尺度环流形势的调整,特别是中纬度环流形势向"东高西低"转变,是久旱转雨的必要条件。进一步分析发现,这次暴雨过程与典型的西太平洋副高西伸北抬,副高外围的西南暖湿气流增强、低空急流、低涡切变和不稳定层结的发展等有关。久旱转雨降水主要产生在低层高能舌、水汽辐合带及低层辐合、高层辐散的上升气流区内。Application of General information,T639 numerical prediction products and physic live information,we diagnoses the circulation evolution and various physical characteristics in the process of drought to rain on August 14, 2011.Resuhs indicate that Hohhot over the long-term stability of the arid period ＂West to East high and low＂ circulation-type;adjustment of large scale circulation,particularly latitude circulation to ＂East West＂ change is a necessary condition of drought to rain.Further analysis found that the rainstorm contact with the Western Pacific typical subtropical high and West extending north,subtropical South-western perimeter of the warm, moist air enhancement,low level Jet, Vortex development of stratified shear and instability, and so on.Drought to rain precipitation mainly merge in the mixed area of energy of tongue in the lower,water vapor ＇senior and low-level convergence,and divergence in the updraft area.

关 键 词：久旱转雨 转折性特征 主要系统 物理量诊断 

分 类 号：S16[农业科学—农业气象学]