| 宁夏北部一次短时暴雨中尺度对流系统的特征分析 |
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| 引用本文： | 纪晓玲,冯建民,穆建华,辛尧胜,马筛艳,聂晶鑫.宁夏北部一次短时暴雨中尺度对流系统的特征分析[J].南京气象学院学报,2010,33(6):711-718. |
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| 作者姓名： | 纪晓玲 冯建民 穆建华 辛尧胜 马筛艳 聂晶鑫 |
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| 作者单位： | [1]宁夏气象防灾减灾重点实验室,宁夏银川750002 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 [3]宁夏气象台,宁夏银川750002 [4]宁夏气象服务中心,宁夏银川750002 |
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| 基金项目： | 宁夏科技攻关项目，中国气象局气象新技术推广预报员专项项目 |
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| 摘 要： | 利用自动站、闪电定位信息、多普勒雷达、卫星黑体亮温等气象资料，对2008年7月18日夜间宁夏石炭井的短时暴雨天气进行了分析。结果表明：此次单站短时暴雨是在“西高东低”的环流背景下，受东北冷涡后部横槽和低值系统影响，由两个相对较强的对流单体先后影响而后合并维持造成的。中尺度对流系统在宁夏北部持续时间近6h，云项亮温梯度最大值维持在石炭并一带；对应3次强降水时段，雷达回波强度、回波顶高、VIL出现了3次峰值，径向速度出现了气旋式辐合和逆风区结构，逆风区出现时间较强降水出现提前了20～30min，与强降水的发生、发展和减弱有较好的对应关系；闪电发生高密度区位于降水中心前缘，闪电频率突然增大时间较强降水出现超前1h。
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| 关 键 词： | 短时暴雨 中尺度对流系统 黑体亮温 雷达图像特征 逆风区 闪电 |
Analysis on Characteristics of Mesoscale Convective System during a Short-term Rainstorm Process in North of Ningxia |
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| JI Xiao-ling,FENG Jian-min,MU Jian-hua,XIN Yao-sheng,MA Shai-yan,NIE Jing-xing.Analysis on Characteristics of Mesoscale Convective System during a Short-term Rainstorm Process in North of Ningxia[J].Journal of Nanjing Institute of Meteorology,2010,33(6):711-718. |
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| Authors: | JI Xiao-ling FENG Jian-min MU Jian-hua XIN Yao-sheng MA Shai-yan NIE Jing-xing |
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| Institution: | g ( 1. Key Laboratory of Preventing and Reducing Meteorological Disaster of Ningxia, Yinchuan 750002, China; 2. State Key Laboratory of Severe Weather of CAMS,Beijing 100081 ,China; 3. Ningxia Meteorological Observatory,Yinchuan 750002,China;4. Meteorological Service Centre of Ningxia,Yinchuan 750002,China) |
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| Abstract: | By using the data of automatic weather station, lightning location system, Doppler radar and satellite,the short-term rainstorm process occurred at Shitanjing on 18 July 2008 is analyzed. Result shows that the short-term rainstorm occurred under the circulation of ＂pressure ridge at west and trough at east＂, and was affected by the transversal trough at the back of northeast cold vortex and the low pressure system. There are two strong convective cells, which influenced Shitanjing successively, and then combined and sustained. The MCS （ mesoscale convective system） maintained in the north of Ningxia for almost 6 hours, and the highest cloud top TBB （ blackbody brightness temperature） gradient located at Shitanjing. Corresponding with the three precipitation stages, there are three peaks of echo intensity, echo tops and VIL during the rainstorm process. There are cyclonic convergence and adverse wind area in radial velocity graphs. The appearing of adverse wind area is 20--30 minutes earlier than that of the strong precipitation, and its echo evolution has better relationship with the evolution of precipitation. The high density lightning area locates in the front of precipitation center, and the sudden increasing of lightning frequency occurs one hour earlier than the heavy rain. |
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| Keywords: | short-term rainstorm mesoscale convective system TBB echo feature adverse wind area lightning |
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