| 滇黔静止锋大暴雨的锋面特征及其对MCS的影响 |
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| 引用本文： | 唐延婧,胡跃文,谢清霞.滇黔静止锋大暴雨的锋面特征及其对MCS的影响[J].气象科技,2014,42(1):151-157. |
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| 作者姓名： | 唐延婧 胡跃文 谢清霞 |
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| 作者单位： | 贵州省气象服务中心, 贵阳 550002;贵州省气象服务中心, 贵阳 550002;贵州省气象服务中心, 贵阳 550002 |
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| 基金项目： | 公益性行业（气象）科研专项目（GYHY201306059）资助 |
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| 摘 要： | 2012年5月21—22日,贵州省出现了一次典型的Ⅲ型静止锋在南支槽的引导下锋生而触发MCS形成暴雨的过程。MCS有非线性、降水强的特征。分析发现:低层静止锋锋区强,锋生明显;锋前有高能舌及低涡切变发展,切变南侧有偏南急流。垂直方向上锋区陡峭,锋前上凸区内上升气流强,对流不稳定;南支槽及高低空系统的前倾配置是上升气流强的原因。这些锋面特征为MCS发生发展提供了有利条件:低层高能舌和低涡切变为MCS提供了热力和动力条件;偏南急流是影响MCS的重要因素。锋前上凸区是MCS发展的重要区域,锋区附近的θse场及高低空系统前倾配置利于MCS发生发展。锋前到锋区附近的水汽条件好,急流出口处的水汽辐合及上升气流为MCS和大暴雨提供了有利水汽输送。
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| 关 键 词： | 静止锋 MCS 高能舌 偏南急流 上升运动 |
| 收稿时间： | 2012/11/21 0:00:00 |
| 修稿时间： | 2013/5/13 0:00:00 |
Frontal Characteristic of a Heavy Rainstorm Induced by Yunnan Guizhou Stationary Front and Effects on Mesoscale Systems |
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| Tang Yanjing,Hu Yuewen and Xie Qingxia.Frontal Characteristic of a Heavy Rainstorm Induced by Yunnan Guizhou Stationary Front and Effects on Mesoscale Systems[J].Meteorological Science and Technology,2014,42(1):151-157. |
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| Authors: | Tang Yanjing Hu Yuewen and Xie Qingxia |
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| Institution: | Meteorological Service Center of Guizhou Province, Guiyang 550002;Meteorological Service Center of Guizhou Province, Guiyang 550002;Meteorological Service Center of Guizhou Province, Guiyang 550002 |
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| Abstract: | In 21 and 22 May 2012, a heavy rainstorm process happened in Guizhou Province, which was a typical MCS-triggered process, caused by the frontogenesis of type-l]1 stationary front, under the guidance of a southern trough. The MCS was non-linear with severe rainfall. Analysis reveals that the stationary front was strong; the frontogenesis process was obvious with a high energy tongue and a low vortex shear at the front, and a southerly jet on the south side. In the vertical direction, the front had a steep frontal area and strong upward motion, which was caused by the southern trough, the forwar＆lean distribution, and the convective instability of the convex. These characteristics are beneficial to MCS： the high energy tongue and low vortex shear provide thermal and dynamic conditions for MCS, and the southerly jet is also an important factor. In the vertical direction, the convex area was important, and the distribution of Ose and the forward-lean distribution were beneficial. The moisture conditions in the front of and on the front were sufficient. Moisture convergence at the exit of the southerly jet and upward flow were sufficient to supply the moisture for MCS and the heavy rainstorm. |
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| Keywords: | stationary front MCS high energy tongue southerly jet upward motion |
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