热带气象学报2011，Vol.27Issue(1)：89-94,6.DOI:10.3969/j.issn.1004-4965.2011.01.010
华北冷涡背景下强对流天气的基本特征分析
THE BASIC FEATURES OF THE SEVERE CONVECTION AT THE BACKGROUND OF COLD VORTEX OVER NORTH CHINA
摘要
Abstract
The risk weather data in Beijing, Tianjin and Hebei are used to analyze the temporal-spatial distribution as well as the dynamic-thermal characteristics of the severe convection associated with cold vortex over North China during 2001-2008 from May to August. The results indicate that: (1) Short-term heavy precipitation had the largest occurrence probability in coastal areas, especially during the afternoon to evening. The strong wind and hail had the largest probability during morning in the mountain of Northwest Hebei, and the region of large probability expanded southward and eastward from the afternoon to evening.The largest occurrence probability of tornado was in the morning, the center was in Beijing. (2) There were northwest wind mostly, and gale mainly; most hail diameter were 5 ～ 20 mm; short-term heavy precipitation occurred mainly lasting less than 20 minutes, and the precipitation were 20 ～ 23 mm mostly. The large convection intensity was located in the leeward of Taihang and Yanshan Mountains and the coastal areas. (3) Before the occurrence of short-term heavy precipitation, the vapor was the most favorable, the Convective Available Potential Energy(CAPE) and Best Lifting Index(BLI) were the largest, but the Lifting Condensation Level(LCL) was the highest. (4) Before the occurrence of strong wind, the vertical wind shear was the strongest, the LCL was the lowest. (5) Before the occurrence of hail, the height of 0 ℃ was about 3 400 m,the height of-20 ℃ was about 6 400 m, the Storm Relative Helicity(SRH)＞150 m2/s2.关键词
天气学/统计特征/强对流/华北冷涡/对流参数Key words
synoptic meteorology/ statistical features/ severe convection/ cold vortex over North China/convection parameter分类
天文与地球科学引用本文复制引用
郁珍艳,何立富,范广洲,李泽椿,苏永玲..华北冷涡背景下强对流天气的基本特征分析[J].热带气象学报,2011,27(1):89-94,6.基金项目
科技部公益性行业专项(GYHY200706042)资助 （GYHY200706042）
