论文

一次槽前“干”对流背景下阵风锋天气过程分析

  • 武麦凤 ,
  • 吉庆 ,
  • 武维刚
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  • 渭南市气象局, 渭南 714000

收稿日期: 2016-01-18

  网络出版日期: 2017-06-28

基金资助

中国气象局预报员专项(CMAYBY2016-074)

A Mesoscale Analysis of a Gust Front Weather Process Caused by Fore-Trough Dry Convection

  • WU Maifeng ,
  • JI Qing ,
  • WU Weigang
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  • Weinan Meteorological Bureau of Shaanxi province, Weinan 714000, China

Received date: 2016-01-18

  Online published: 2017-06-28

摘要

对2015年8月23日发生在陕西关中的一次伴有阵风锋的强对流天气过程的不稳定度条件\,卫星云图和雷达资料进行分析,结果表明:本次强对流天气过程虽然发生在槽前,但垂直环境配置为“上干下湿”,属于槽前“干”对流,850 hPa的切变线为强对流提供了初始扰动,地面辐合线触发了强对流天气的发生;两条阵风锋均出现在对流云团边缘TBB梯度最大的区域内、对流有效位能剧烈释放时;另外,两条阵风锋的相向运动,导致两条阵风锋之间强对流单体的产生。当强对流云团与阵风锋叠加时,一方面,二者相互抑制,互为削弱,阵风锋很快消散;另一方面,与阵风锋相联系的对流云团中因为有新的对流单体补充又迅速发展,产生更剧烈的强对流天气。

本文引用格式

武麦凤 , 吉庆 , 武维刚 . 一次槽前“干”对流背景下阵风锋天气过程分析[J]. 高原气象, 2017 , 36(3) : 845 -851 . DOI: 10.7522/j.issn.1000-0534.2016.00055

Abstract

Based on the instability conditions, FY-2E satellite images and Doppler radar data, a severe convective weather accompanied by gust front which occurred on August 23, 2015 in Guanzhong of Shaanxi was analyzed. The results indicated that this process belongs in fore-trough dry convection although it took place in front of trough, while the humidity of high-altitude was less than that of the low-altitude. 850 hPa shear line provided initial disturbance for the strong convection which was triggered by ground convergence line. Two gust fronts both appeared at the edge of convective clouds where the gradient of TBB reached a maximum with severe release of CAPE. Opposite movement of two gust fronts caused the engendering of strong convective cells. With the superimposition of strong convective clouds and gust front, both of them weakened each other, which caused disappearance of gust front. On the other hand, convective clouds grew fast because of supplement of new convective cells, which led to stronger convective weather.

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