| 突发性暴雨的中尺度对流复合体环境条件的个例分析 |
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| 引用本文： | 许美玲,段旭,施晓辉,何华.突发性暴雨的中尺度对流复合体环境条件的个例分析[J].气象科学,2003,23(1):84-91. |
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| 作者姓名： | 许美玲 段旭 施晓辉 何华 |
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| 作者单位： | 云南省气象台,昆明,650034 |
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| 基金项目： | 云南应用基金 2 0 0 0D 0 0 91M，云南省“十五”攻关项目 2 0 0 1NG4 3共同资助 |
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| 摘 要： | 本文给出了2001年8月24－25日在500hPa西北气流下产生的对流云团单体合并、加强形成中尺度对流复合体（简称MCC）的发展过程，并对其发生的环境条件进行了分析。结果表明，当低层水汽充足、局地大气具有潜在不稳定能量和适当的触发条件时，在500hPa西北气流控制的地区会出现中尺度对流复合体，产生强降水天气。本次过程主要是低层气流的辐合造成水汽、能量的聚积，低层的增暖增湿，高层的干冷空气入侵，形成了强的对流不稳定区；中尺度扰动及低空偏南气流在地面静止锋上被迫抬升，引起中尺度对流云团发展合并，是MCC生成的主要机制。
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| 关 键 词： | 中尺度对流复合体 大暴雨 环境条件 |
| 收稿时间： | 2002/1/23 0:00:00 |
| 修稿时间： | 2002年1月23日 |
AN ENVIRONMENTAL CONDITION ANALYSIS ON MESOSCALE CONVECTIVE COMPLEX OF SPATE |
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| Xu Meiling,Duan Xu,Shi Xiaohui and He Hua.AN ENVIRONMENTAL CONDITION ANALYSIS ON MESOSCALE CONVECTIVE COMPLEX OF SPATE[J].Scientia Meteorologica Sinica,2003,23(1):84-91. |
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| Authors: | Xu Meiling Duan Xu Shi Xiaohui and He Hua |
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| Institution: | Yunnan Meteorology Observatory,Kunming 650034;Yunnan Meteorology Observatory,Kunming 650034;Yunnan Meteorology Observatory,Kunming 650034;Yunnan Meteorology Observatory,Kunming 650034 |
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| Abstract: | This paper gives the developing process of mesoscale convective complex(MCC) produced by consolidation and strengthen of convection cell brought by northwest air stream on 500hPa level from 24 to 25 August, 2001 and out carries analysis of the environment condition of it. The result shows that,if water vapor on low levels is abundant and local atmosphere has latent instability energy and suitable trigger mechanism, then MCC and strong rainfall will appear in the region controlled by northwest air stream on 500hPa level. The collection of water vapor and energy produced by convergence of air stream on low levels in this process is major. The strong convective instability region is formed by enhancement of temperature and humidity on low levels and intrusion of cold air on higher levels. The lifting of mesoscale turbulence and air stream inclined to south on low levels forced by stationary front on surface brings on development and consolidation of mesoscale convective cloud cluster, it is major out-growth mechanism of MCC. |
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| Keywords: | Mesoscale convective complex Spate Environmental condition |
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