| 一次低涡切变影响云南大雨过程分析 |
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| 引用本文： | 张腾飞,普贵明,李燕.一次低涡切变影响云南大雨过程分析[J].气象科技,2004,32(Z1):8-14. |
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| 作者姓名： | 张腾飞 普贵明 李燕 |
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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： | 云南省“十五”攻关项目 (2 0 0 1NG43 )资助 |
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| 摘 要： | 利用昆明 3830 /CC多普勒天气雷达观测资料 ,结合MICAPS客观分析资料 ,对 2 0 0 3年 9月 2日的一次大雨天气过程进行分析。结果表明 :在有利的低涡切变和地面冷锋环流背景和有利的热力、动力条件下 ,不断触发中尺度切变线和中尺度涡旋的生成和发展。中尺度切变线和中尺度涡旋是强对流生成和发展的动力 ,先后生成“人”字型回波、飑线和两个中尺度絮状回波团直接导致大雨天气过程 ,表现出了许多中尺度特征 ,零速度线的位置、变化和正、负速度相对位置的演变与中尺度天气系统的生成和发展密切相关。
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| 关 键 词： | 大雨 多普勒天气雷达 环流背景 中尺度特征 |
| 修稿时间： | 2003年10月28 |
Analysis of Yunnan Heavy Rainfall Caused by Low-Vortex Shear |
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| Zhang Tengfei,Pu Guiming,Li Yan.Analysis of Yunnan Heavy Rainfall Caused by Low-Vortex Shear[J].Meteorological Science and Technology,2004,32(Z1):8-14. |
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| Authors: | Zhang Tengfei Pu Guiming Li Yan |
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| Abstract: | By using Doppler weather radar echo data and MICAPS objective analysis data, the heavy rain on 2 September 2003 was analyzed. The results show that mesoscale shears and mesoscale vortexes were induced and developed under the favorable circulation background, which were the dynamic conditions of strong convective cloud formation. During the process of the heavy rain, the vortex zonal echoes, a squall line and two mesoscale floccus echoes with many mesoscale features formed successively. The location and variation of the zero velocity line and the relative location of positive and negative velocity zones were related to the formation and development of mesoscale weather systems. |
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| Keywords: | heavy rain Doppler weather radar circulation background mesoscale feature |
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