| 一次华北飑线的观测分析 |
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| 引用本文： | 吕胜辉.一次华北飑线的观测分析[J].气象科技,2007,35(2):217-221. |
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| 作者姓名： | 吕胜辉 |
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| 作者单位： | 民航天津空中交通管理站,天津,300300 |
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| 摘 要： | 利用气象常规观测资料、卫星、自动观测系统、多普勒雷达等多种资料,对2004年7月23日发生的华北飑线进行了观测分析。分析表明:华北飑线发生在副高西北侧的不稳定区域,产生于中尺度对流系统(MCS)当中,地面冷锋和副高南退以及高空前倾槽的形势,使MCS向东南方向移动过程中发展,加强成为飑线;华北地区中、低层水汽通量的辐合,为此区域强对流的发生提供了充足的水汽;850 hPa和700 hPa低空急流的存在,一方面强劲的西南气流输送的暖湿平流加强了华北地区不稳定层结,另一方面急流附近的强风切变为飑线的产生提供了动力条件。
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| 关 键 词： | 飑线 中尺度对流系统 前倾槽 多普勒雷达 |
| 收稿时间： | 2005/6/15 0:00:00 |
| 修稿时间： | 2005年6月15日 |
Observational Analysis of a Squall in North China |
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| Lü Shenghui.Observational Analysis of a Squall in North China[J].Meteorological Science and Technology,2007,35(2):217-221. |
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| Authors: | Lü Shenghui |
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| Abstract: | A squall happened on 23 July 2004 in North China is analyzed on the basis of conventional meteorological observation data,as well as cloud,automatic weather station and Doppler radar data.It is found that the squall took place in the instability area near the northwest of the subtropical high,and was caused by a mesoscale convective system(MCS).A surface cold front,the southward moving of the subtropical high,and the upper-level forward trough made the MCS move southeastward and enforced into a squall.The low-and middle-level moisture flux convergence in North China provided plenty of water vapor for the occurrence of strong convection.The low-level jet at 850 hPa and 700 hPa brought warm and moist southwest air to North China and intensified the unstable stratification.The strong wind shear near the low-level jet provided dynamic conditions for the occurrence of the squall. |
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| Keywords: | squall line mesoscale convective system forward trough Doppler radar |
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