气象与环境学报2017，Vol.33Issue(6)：34-41,8.DOI:10.3969/j.issn.1673-503X.2017.06.005
郑州地区一次冷锋后高架雷暴天气过程特征及成因分析
Characteristics and causes of an elevated thunderstorm case happening after a cold front in Zhengzhou area
摘要
Abstract
Based on conventional meteorological observation and the NCEP ( National Centers for Environmental Prediction) 6 hourly 1° × 1° reanalysis data,the characteristics and causes of an elevated thunderstorm weather process happening in Zhengzhou area in early spring of 2015 were analyzed. The results showed that the ground cold pad,850 hPa and 700 hPa strong warm jet and trough at 500 hPa provide favorable dynamic, thermal and moisture conditions for the occurrence of an elevated thunderstorm. A large vertical wind shear between 700 hPa and 850 hPa and the large temperature difference between 700 hPa and 500 hPa show that there is a strong convec-tive instability above the inversion layer,which is helpful for the occurrence of this elevated thunderstorm. A nega-tive moisture vapor flux divergence and strong humidity advection at the low level provide an abundant water va-por for the elevated thunderstorm. Before the occurrence of thunderstorm,Δθse between 700 hPa and 500 hPa is a-bove 0 ℃,and the atmosphere above 700 hPa is in a convective instability condition. The negative MPV1 ( Moist Potential Vorticity) at the low level indicates that there is a moist symmetric instability condition in this layer,and the strong thunderstorm falls just in the convective instability zone and the negative area of MPV1 . All these results indicate that this elevated thunderstorm is the result of joint interaction between convective instability and moist symmetrical instability. The warm air mass on the ground cold pad is gradually strengthened. It further exacerbates the atmospheric stratification stability above the inversion layer. By comparing with historical cases,it is found that the two elevated thunderstorm weather processes over Zhengzhou have some common features. The pumping action in front of 500 hPa troughs,low-level shear line,the convergence ascending motion at the left side of the low-level jet and the uplift of the ground cold pad should be the focus to forecast the elevated thunderstorms.关键词
高架雷暴/冷垫/低空急流/对流不稳定/湿对称不稳定Key words
Elevated thunderstorm/Cold pad/Low-level jet/Convective instability/Moist symmetric instability分类
天文与地球科学引用本文复制引用
崔慧慧..郑州地区一次冷锋后高架雷暴天气过程特征及成因分析[J].气象与环境学报,2017,33(6):34-41,8.基金项目
河南省科技攻关项目"大城市暴雨、强对流精细预报与监测预警技术研究"(162102310056)、河南省强对流创新团队和中国气象局华中区域气象中心科技发展基金项目(QY-Z-201302)共同资助. （162102310056）
