摘要
2012年7月中旬贵州遭受区域性强降水,利用NCEP/NCAR逐6 h 1o×1o再分析资料、常规气象观测资料和地面加密观测资料,分为两阶段从影响系统和形成机制方面进行对比诊断分析。结果表明:第一阶段影响系统主要有高空槽、中低层切变线和低空急流,地面辐合线是强降水的主导因素,属于对流性降水天气,第二阶段主要受高空系统(高空槽和低涡)影响,对流性和稳定性降水并存;水汽通量辐合中心及强弱能很好的指示强降水落区,大气不稳定更易造成短时强对流天气,中低层气旋性涡度和高层反气旋性涡度的配置更有利于强降水的发生。
The regional severe precipitation occurred in Guizhou in mid July of 2012. We divided the rainfall process into two stages and compared them by diagnostic analysis in terms of impacts system and formation mechanisms, using the NCEP/NCAR 1o×1o reanalysis data by 6 hours, the conventional meteorological data and surface observation data encryption. The results show that： the first stage belongs to the convective precipitation and the influencing systems mainly contain upper trough, middle and low level shear lines and low-level jet. The surface convergence line is the dominant factor of the first stage strong rainfall. The second stage is mainly affected by the altitude system（upper trough and low vortex） influence, and belongs to both convective and stable precipitation. The water vapor flux convergence center and strength can well indicate strong precipitation drop zone. Atmospheric instability is more likely to cause short-time severe convective weather. The configuration of middle and low level cyclonic vorticity and upper level anticyclonic vorticity is more conducive to the strong precipitation.
出处
《中国农学通报》
CSCD
2014年第32期256-262,共7页
Chinese Agricultural Science Bulletin
基金
公益性行业(气象)科研专项(GYHY201306059)
黔科合J字[2012]2227号共同资助
关键词
强降水
影响系统
水汽通量散度
假相当位温
涡度
strong precipitation
influence system
moisture flux divergence
potential pseudo-equivalent temperature
vorticity
