气象2018，Vol.44Issue(2)：258-267,10.DOI:10.7519/j.issn.1000-0526.2018.02.005
中国泛华北地区冷季高架对流特征气候统计分析
Climatology of Cold Season Elevated Convection in Northern China
摘要
Abstract
Conventional surface observation,soundings,comprehensive monitoring data of severe convective weather and NCEP analysis data are used to investigate statistically the spatio-temporal distribution,frontal characteristics and instability mechanisms of cold season (except June,July and August) elevated convections in northern China (32.5°-53.5°N,105°-135°E) during a 16-y period from 2000 to 2015.The events are concentrated in south central Hebei,western Shandong and north central Henan.The annual frequency distribution of elevated convections is bimodal,with a primary peak in February and a secondary peak in November.Cold front is the primary frontal system dominating the events.There exists thick cold surface air and strong temperature inversion when elevated convection occurs and more than half the events are triggered over the inversions with a temperature difference greater than 6℃.In addition,strong vertical wind shear (20-30 m · s-1) is frequently observed which is conductive of symmetric instability.The result further shows that conditional symmetric instability and frontogenetic forcing are the dominant mechanisms generating cold season elevated convections.关键词
冷季高架对流/气候统计分析/不稳定机制Key words
cold season elevated convection/climatology/instability mechanism分类
天文与地球科学引用本文复制引用
刘洲洋,俞小鼎,王秀明,周小刚..中国泛华北地区冷季高架对流特征气候统计分析[J].气象,2018,44(2):258-267,10.基金项目
国家自然科学基金项目(41475042和41775044)共同资助 （41475042和41775044）
