| 成都一次脉冲风暴特征及成因分析 |
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| 引用本文： | 周长春,吴蓬萍,陈梁勋.成都一次脉冲风暴特征及成因分析[J].气象科技,2016,44(2):283-289. |
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| 作者姓名： | 周长春 吴蓬萍 陈梁勋 |
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| 作者单位： | 1 四川省气象台，成都 610072； 2 高原与盆地暴雨旱涝灾害四川省重点实验室，成都 610072,中国气象局成都高原气象研究所，成都 610072,四川省绵阳市气象局，绵阳 621000 |
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| 基金项目： | 四川省气象局课题（川气课题2014 开发 02）和中国气象局预报员专项（CMAYBY2016 063）共同资助 |
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| 摘 要： | 利用多普勒天气雷达观测资料、风廓线仪资料、加密自动气象站资料、常规观测资料和NCEP 1°×1°再分析资料,对2014年7月23日16:00在成都城区发生的一次局地强对流过程进行了分析。结果表明:晴空太阳辐射增温和低层偏南气流的暖湿水汽输送使得成都附近大气具备对流发展的能量和水汽条件;地面暖平流及成都城市热岛效应,使得成都城区低层抬升作用增强;在弱的垂直风切变环境中,南下阵风锋与成都城区西北部地面中尺度热中心和中尺度辐合线相遇,激发出脉冲风暴并迅速发展,进而产生局地强对流天气;多普勒天气雷达资料显示脉冲风暴强盛时期具有悬垂回波、有界弱回波区、中层径向辐合等强风暴的特征。
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| 关 键 词： | 脉冲风暴 局地强对流 阵风锋 城市热岛效应 |
| 收稿时间： | 3/4/2015 12:00:00 AM |
| 修稿时间： | 6/1/2015 12:00:00 AM |
Causes and Characteristics of a Pulse Storm in Chengdu |
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| Zhou Changchun,Wu Pengping and Chen Liangxun.Causes and Characteristics of a Pulse Storm in Chengdu[J].Meteorological Science and Technology,2016,44(2):283-289. |
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| Authors: | Zhou Changchun Wu Pengping and Chen Liangxun |
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| Abstract: | To investigate the pulse storm occurred at 06:00 23 July 2014 in the urban area of Chengdu, the data of Doppler radar, wind profile, automatic weather station, conventional observation, and NCEP 1°×1° reanalysis are synthesized and analyzed. It is demonstrated that the clear sky solar radiation and low level water transportation provide energy and moisture conditions for convection development in Chengdu thereabout. The warm advection and urban heat island of the surface layer enhanced the uplift movement at lower levels over the Chengdu urban area. In the weak vertical wind shear area, when gust front meeting with the mesoscale hot center and convergence line on the ground, the pulse storm occurred and developed. The features of the severe storm can be found from Doppler radar echoes, such as the overhanging echo, boundary weak echo range, mid altitude radial convergence, etc. |
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| Keywords: | pulse storm local severe storm gust front urban heat island |
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