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气象:2013,39(10):1275-1283
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三次雷暴导致的阵风锋过程分析
(1.成都信息工程学院大气科学学院,成都 610225;2.中国气象局气象探测中心,北京 100081;3.成都信息工程学院电子工程学院,成都 610225)
Analysis of the Gust Front Caused by Three Thunderstorms
(1.College of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225;2.CMA Meteorological Observation Centre, Beijing 100081;3.College of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225)
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投稿时间:2012-12-12    修订日期:2013-03-24
中文摘要: 利用多普勒天气雷达资料和自动站资料对2012年5月16日江苏、6月9日京津冀地区以及7月10日河北的三次阵风锋过程进行综合分析。结果表明:持续下沉的冷空气形成雷暴高压是阵风锋产生的直接原因。雷暴高压形成过程中,一方面,下沉气流在较小区域内迅速堆积形成雷暴高压,另一方面,新旧单体不断更替,风暴内稳定的下沉气流使雷暴高压发展。雷暴高压内强辐散气流与环境空气形成阵风锋。随着雷暴高压的移动和增强,阵风锋向前移动和增强,当雷暴高压减弱,阵风锋也逐渐消亡。温度梯度与气压梯度越大,瞬时大风越强,阵风锋也越强。阵风锋产生的瞬时大风与窄带回波的强度值不一定成正比。中层径向辐合对阵风锋产生有提前预示作用,提前量为半小时左右,辐合持续时间越长,阵风锋生命史越长。
Abstract:Using the Doppler radar and AWS data, this paper comprehensively analyzed three gust front processes which took place in Jiangsu Province on 16 May, in Beijing Tianjin Hebei region on 9 June and in Hebei Province on 10 July 2012. It turned out that the thunderstorm high which is formed by the continuous subsiding cold air, is the immediate cause of the formation of gust front. In the formation process of thunderstorm high, on the one hand, cold subsiding air stacks rapidly and forms thunderstorm high in a narrow area; on the other hand, the new monomers constantly replace the old, thus, stable downdraft in the storm develops thunderstorm high. Under the high pressure, strong divergence airflow and ambient air form the gust front. Gust front moves forward and enhances with the movement and enhancement of the thunderstorm high, and gradually disappears when thunderstorm high weakens. The greater temperature gradient and pressure gradient are, the stronger instantaneous high winds and gust front become. Instantaneous high wind speed that gust front produces is not always proportional to the intensity values of narrow band echo. MARC can indicate the emergence of gust front about half an hour, and the longer the convergence maintains, the longer the gust front maintains.
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基金项目:中国气象局“新一代天气雷达建设业务软件系统开发”(ROSE)项目资助
引用文本:
张涛,李柏,杨洪平,朱克云,康雪,2013.三次雷暴导致的阵风锋过程分析[J].气象,39(10):1275-1283.
ZHANG Tao,LI Bai,YANG Hongping,ZHU Keyun,KANG Xue,2013.Analysis of the Gust Front Caused by Three Thunderstorms[J].Meteor Mon,39(10):1275-1283.