气象2016，Vol.42Issue(10)：1197-1212,16.DOI:10.7519/j.issn.1000-0526.2016.10.004
上海地区移动型雷暴阵风锋特征统计分析
Characteristics’Statistical Analysis of Gust Front Generated by Moving Thunderstorms in Shanghai
摘要
Abstract
Using conventional weather observations,dual Doppler radar data,Global Forecast System (res-olution is 3 km )analysis field data,automatic weather station data,characteristics including synoptic background,sounding and radar features of 18 gust fronts generated by moving thunderstorms from 2009-2014 in Shanghai are analyzed.According to the mutual interaction between gust front and its original thunderstorm,these gust fronts are divided into two types.The first type tends to appear during the de-veloping period of the original storm,moving in the same direction with the thunderstorm while keeping a certain distance,usually accompanied by the elevated rear-inflow jet (RIJ)and its lifetime is longer than two hours.The other type usually occurs during the dissipating period of its original thunderstorm,mov-ing far away from the thunderstorm in the same direction (12 cases)or different direction (4 cases).Sta-tistical analysis shows that,as for the first type of gust front,it continuously lifts the warm and moist air in front of the storm while moving in the same direction with the storm.In addition,since the relative strong vertical wind shear and convective available potential energy (CAPE)play an important role in the maintenance of the height of the RIJ ,the balance between the positive vorticity generated by RIJ and verti-cal wind shear and the negative vorticity generated by the cold pool is favorable for the development of the thunderstorm,so the thunderstorms develop and sometimes new storms initiate at the rear side of the gust front.As for the second type,because the gust front moves away from the original storm,and propagates as isolated waves,the cold and dry air at its rear side gradually weakens while affected by the environ-ment .Gust front moving far away from the storm in the same direction cuts off the transport of the warm and wet air into the storm.Simultaneously,in the weak-to-middle vertical wind shear and weak-to-middle CAPE environment,the negative vorticity generated by the downward RIJ and cold pool is stronger than the positive vorticity generated by vertical wind shear,and the updraft leans back over the cold pool. These are unfavorable for the development of the storm.The lifetime of the storm is usually less than 2 hours.关键词
阵风锋/后侧入流急流/窄带回波Key words
gust front/rear-inflow jet (RIJ)/narrow band echo分类
天文与地球科学引用本文复制引用
陶岚,戴建华,李佰平,陈雷..上海地区移动型雷暴阵风锋特征统计分析[J].气象,2016,42(10):1197-1212,16.基金项目
国家自然科学基金项目（41175050）和公益性行业（气象）科研专项（GYHY201006002）共同资助 （）
