气象与环境学报Issue(5)：16-24,9.DOI:10.3969/j.issn.1673-503X.2015.05.003
2013年“0801”豫中南地区强对流天气过程中尺度特征及成因分析
Analysis of mesoscale characteristics of severe convective weather and its forming reason in central and southern areas of He′nan province on August 1,2013
摘要
Abstract
Based on conventional observational data,NCEP 1°×1 °grid data,satellite data and radar data,mesosa-cale features of a convective weather process on August 1,2013 and its forming reasons in the central and southern areas of He′nan province were analyzed.The results show that this process is caused by combined actions of upper trough,subtropical high peripheral southwest air flow,middle and lower shear line and low level jet.Eastward con-vective cloud clusters along the Sichuan basin combine with another one formed in low-level shear line of Jiang-huai region and both become a new cloud cluster,which lead to rainfall higher than average value.Gust fronts,ech-o hanging,weak echo region (WER)and boundary weak echo region (BWER)are quite clear on the PPI and RHI charts of radar reflectivity factors,and features such as divergence on low tilts,large radial velocity region,in-flow flows,divergence in the upper level and convergence in the low level are also evident in the radial velocity chart.The mesoscale evolution suggests that a series of mesoscale rain storm missions generate,develop,consoli-date,strengthen and become mesoscale convective complexes,and the mesoscale convective rain group is generated near area of CAPE dense bands and ground convergence line,with a trend moving to the large value area of CAPE and ground mobile convergence line.Vertical configuration of energy distribution that high-level low-energy tongue superimposed on lower energy tongue leads to establishment of atmospheric convective instability.The de-velopment of vorticity and horizontal wind shear leads to development of vertical vorticity,making vertical vorticity increased and upward motion enhanced.Low level jet coordinating with upper trough generates a secondary circu-lation whose vertical upward branch makes ascending movement strengthened and triggering convective unstable energy release to generate severe convection,and then forms severe precipitation.关键词
强对流/对流云团/回波/中尺度特征Key words
Severe convective/Convective cloud cluster/Echo/Mesoscale feature分类
天文与地球科学引用本文复制引用
武威,顾佳佳..2013年“0801”豫中南地区强对流天气过程中尺度特征及成因分析[J].气象与环境学报,2015,(5):16-24,9.基金项目
河南省气象局项目“沙澧河流域定量降水预报技术方法研究”（Z201418）和河南省气象局气象科学技术研究项目“沙澧河流域多模式细网格降水和2 m 温度在乡镇精细化预报上的应用（Z201519）”共同资助。 （）
