| 一次强雷暴中的多灾种天气特征对比分析 |
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| 引用本文： | 王洪生,钟颖颖,吴海英,高晓静,刘燕.一次强雷暴中的多灾种天气特征对比分析[J].气象科学,2014,34(4):465-471. |
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| 作者姓名： | 王洪生 钟颖颖 吴海英 高晓静 刘燕 |
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| 作者单位： | 江苏省防雷中心, 南京 210009;常州市防雷中心, 江苏常州 213022;江苏省气象台, 南京 210008;江苏省防雷中心, 南京 210009;江苏省防雷中心, 南京 210009 |
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| 基金项目： | 江苏省气象科研基金重点项目（KZ201207） |
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| 摘 要： | 用Micaps和NCEP再分析资料对2012年7月3日发生在淮河以南地区的大范围强雷暴天气进行了分析,得出高、低空急流配置,形成低空辐合,高空辐散,槽线由高到低前倾,有利增强大气不稳定层结,中尺度切变线南北摆动具有触发对流作用等,为该区强雷暴多灾种天气的发生,提供了动力和热力条件。从云图、雷达参数和地闪特征对比分析得出冰雹、雷击、强降水,分别发生在强对流云团发展的不同时间和不同部位。其云团的形态、强度和范围等也不同。冰雹所表现出的回波强度、回波顶高和垂直积分液态水含量为最强,雷击次之,强降水最弱。在地闪出现的各个阶段都有可能出现雷击事故,但多为负地闪,强度均较强。强降水过程多为负地闪,强度较弱,降水集中时段,地闪频次高。冰雹发生时地闪频数明显下降,且多为正闪。雷击过程强度和陡度变化最平缓,冰雹过程突变最明显。雷击发生在整个地闪过程中强度和陡度都相对较大的时刻;冰雹发生前约半小时有强度和陡度的骤增;强降水阶段地闪平均强度和陡度都最小。
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| 关 键 词： | 雷暴 强对流天气 云团特征 雷达回波 对比分析 |
| 收稿时间： | 2013/10/22 0:00:00 |
| 修稿时间： | 2014/1/13 0:00:00 |
Comparative analysis on characteristics of multi-disaster weather in a strong thunderstorm |
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| WANG Hongsheng,ZHONG Yingying,WU Haiying,GAO Xiaojing and LIU Yan.Comparative analysis on characteristics of multi-disaster weather in a strong thunderstorm[J].Scientia Meteorologica Sinica,2014,34(4):465-471. |
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| Authors: | WANG Hongsheng ZHONG Yingying WU Haiying GAO Xiaojing and LIU Yan |
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| Institution: | Jiangsu Lightning Protection Center, Nanjing 210009, China;Changzhou Lightning Protection Center, Jiangsu Changzhou 213022, China;Jiangsu Meteorological Observatory, Nanjing 210008, China;Jiangsu Lightning Protection Center, Nanjing 210009, China;Jiangsu Lightning Protection Center, Nanjing 210009, China |
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| Abstract: | By using Micaps and NCEP reanalysis data, the wide-range strong thunderstorm occurred in southern Huaihe on July 3, 2012 was analyzed. Results show that the strong thunderstorms and multi-disaster weatherwere based on the following dynamic and thermodynamic conditions: the low convergence and upper divergence formed by the jet configuration at high and low level, the strengthening of the atmospheric instability stratification caused by the forerake of slot line from up to down, and convection triggerred by swinging of mesoscale shear line from south to north. The comparative analysis on satellite images, radar parameters and ground flashes characteristics indicates that lightning stoke, heavy rain and hail all occurred in different parts and periods during the development of strong convective clouds, whose features, intensity and range of evolution were also different. The echo intensity, echo top and vertical integrated liquid water content in hail area were the strongest, then lightning, finally heavy rain. Lightning accidents would happen in each period of ground flashes, which were mostly negative with strong intensity. Most ground flashes occurred in the period of heavy rain were weak and negative, and in the concentrated precipitation period, the flashes occurred frequently. Generally, the flash frequency decreased while the hails happened, and most of them were positive. The lightning intensity and steepness changed gently in lightning stroke area, while in hail area, their variation became obvious. Lightning stroke occurred when the flashes intensity and steepness were all relatively significant; the high intensity and steepness broke out half an hour before hail happened. Both the average intensity and steepness twnded to be the minimum during the heavy rain period. |
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| Keywords: | Thunderstorm Strong convective weather Cloud characteristics Radar echo Comparative analysis |
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