2015年6月鹰潭2次连续强降水过程对比分析

摘要

The region suffered a continuous heavy rain weather process in Yingtan on June 2015 . We divided the rainfall process into two stages and compared them by diagnostic analysis in terms of im-pacts system and formation mechanisms,using the conventional meteorological data,the regional sta-tion data encryption and NCEP/NCAR 1° × 1° reanalysis data by 6 hours. 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 second stage is mainly affected by the upper trough,the subtropical high peripheral and low vortex influence,and belongs to both convective and stable precipitation. And then by comparing found that the water vapor flux convergence center and strength can Strengthen the happening of the strong precipitation. The configuration of middle and low level cyclonic vorticity and upper level anticyclonic vorticity is more conducive to the strong precipitation.%利用常规地面观测资料、区域站资料和NCEP逐6 h 1°×1°的再分析资料，分别从2次强降水过程的影响系统形成机制上做了对比分析。结果表明：第1阶段强降水的主要影响系统有高空槽、中低层切变线和低空急流，属于对流性降水过程；第2阶段强降水过程主要受高空槽、副高外围和低涡的影响，对流性和稳定性降水并存，同时对比发现水汽通量散度辐合中心能加强强降水的发生，低层正涡度和高层负涡度的上下配置更能造成强降水的发生。