| 2010-07-23陕西中西部大暴雨天气诊断分析 |
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| 引用本文： | 牛乐田,石小龙,胡 伟,李祥林.2010-07-23陕西中西部大暴雨天气诊断分析[J].陕西气象,2012(1):1-4. |
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| 作者姓名： | 牛乐田 石小龙 胡 伟 李祥林 |
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| 作者单位： | [1]山西省气象台,山西太原030006 [2]山西省气象局,山西太原030002 |
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| 摘 要： | 分析结果表明：①山西北部的暴雨云团在850hPa暖切变线南部生成、发展，并在地面切变线附近合并；山西南部的MCC由3个B中尺度对流云团发生、发展、合并形成，β中尺度对流云团在700hPa次天气尺度切变线上触发生成；MCC发展、成熟阶段，α中尺度云团沿925hPa暖切变线东移；减弱阶段，随副高的南压而南压。②副高西进北抬背景下，同一次暴雨过程中，MCC发生在5880gpm边缘弱的斜压环境里，高层则出现在高压北侧的反气旋环流中；一般暴雨云团发生在5840gpm边缘较强的斜压环境里，高层则出现在急流人口区的右侧。③MCC作为大型的中尺度对流系统，不但对低层高温高湿能量的需求比一般暴雨云团更多，而且在垂直方向上，要求湿层、高能舌、暖温结构更深厚。④南部MCC影响区及5880gpm线边缘为负地闪覆盖区，正地闪主要出现在北部一般暴雨云团影响区及5840gpm线附近。一般暴雨云团影响下比MCC影响下，局地闪电开始及闪电峰值的出现较降水的开始及降水峰值的出现有更多的提前量。⑤山西北部暴雨云团出现在气柱水汽总量梯度的大值区及水汽锋上；山西南部MCC则出现在水汽锋的南侧气柱水汽总量的大值区。气柱水汽总量对0811暴雨过程有36h的提前量，对暴雨的落区有很好的指示意义。
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| 关 键 词： | 中尺度对流复合体（MCC） 暴雨云团 对比分析 |
The Comparative Analysis Between MCC and General Rainstorm Cloud Clusters during the Process of 0811 Rainstorm |
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| Miao Ai Mei,Dong Chun Qin,Zhang Hong Yu,Shen Li Wen.The Comparative Analysis Between MCC and General Rainstorm Cloud Clusters during the Process of 0811 Rainstorm[J].Journal of Shaanxi Meteorology,2012(1):1-4. |
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| Authors: | Miao Ai Mei Dong Chun Qin Zhang Hong Yu Shen Li Wen |
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| Institution: | 1. Shanxi Province Meteorological Observatory, Taiyuan,Shanxi, 030006 ; 2. Shanxi Province Meteorological Bureau, Taiyaun, Shanxi, 030002 ) |
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| Abstract: | Abstract： The mesoscale convective complex （MCC） in the south of Shanxi and the rainstorm cloud clusters in the north of Shanxi on August 11, 2010 are comparatively analyzed by using T639 1°×1° reanalysis data, FY-2 infrared satellite image and infrared black body temperature （TBB） data, lightning data and total column water vapor data. It demonstrate that rainstorm area in the north of Shanxi was caused by the generation, development, merge of 6 meso-β-scale convective cloud clusters, and the south regional rainstorm happened with the generation, development and eastward movement of the mesoscale convective complex （MCC）. The analysis results indicate that： （1） The northern rainstrom cloud cluster developed in the south of warm shear line on 850hPa, and merged nearby shear line on surface. At the same time, the southern mesoscale convective complex （MCC） was merged by 3 meso-β-scale convective cloud clusters, which developed on the weather-scale shear line on 700hPa. In the process of MCC development and maturity stage, meso-α-scale convective cloud clusters moved east along the warm shear line on 925hPa, and in the process of MCC weakening, meso-α-scale convective cloud clusters moved south with the southward movement of subtropical high belt. （2） With the northwestward advance of the subtropical high during the same rainstorm, MCC developed in the weak baroclinic environment of the 5880gpm region, and in the anticyclone north of high on upper levels; rainstorm cloud clusters tended to develop in the strong baroelinic environment of the 5840gpm region, and in the the right of the upper jet stream entrance area. （3） As a large scale mesoscale convective system, MCC required more energy of high temperature and high humidity than general rainstorm cloud clusters in lower levers, and deeper vertical structure of high humidity, high energy tongue and high temperature. （4） The negative cloud-to-ground lightning appeared in the area which was influenced by the southern MCC and near the 5880gpm region; the positive cloud-to-ground lightning appeared in the area which was influenced by the northern rainstrom cloud clusters and near the 5840gpm region. The time of the begin of lightning and the appearance of the lightning peak was more earlier than the time of rainfall and the appearance of the rain intensity peak in the backgroud of general rainstorm cloud clusters, comparing in the banckground of MCC. （5） The northern rainstorm cloud clusters developed in the area of high gradient of vertically integrated water content and on the front of water vapor; the southern mesoscale convective complex（MCC） developed in the area of high value of total column water vapor, the south of the water vapor front. We had 36 hours ahead of time to exactly forecast 0811 rainstorm with the total column water vapor data, which showed a significant indication to area of rainstorm. |
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| Keywords: | Mesoscale convective complex （MCC） Rainstorm Cloud Clusters Comparative analysis |
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