| 江西夏季雷电天气热力条件及不稳定指数对比分析 |
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| 引用本文： | 郑婧,许爱华,应冬梅,刘芳.江西夏季雷电天气热力条件及不稳定指数对比分析[J].气象与减灾研究,2009,32(2):27-32,F0003. |
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| 作者姓名： | 郑婧 许爱华 应冬梅 刘芳 |
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| 作者单位： | 江西省气象台,江西南昌,3300446 |
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| 基金项目： | 中国气象局新技术推广预报员专项基金，江西省科技厅项目 |
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| 摘 要： | 选取2007年夏季两次强度不同的致灾雷电过程进行对比，并将其能量参数与典型历史个例进行比较。结果表明：（1）副高位置、500hPa低槽移速、中尺度辐合系统以及热力结构的差异是导致雷暴强度不同的原因之一；（2）中尺度辐合系统移向鄱阳湖时，对流天气更加剧烈，但对大尺度系统鄱阳湖的阻挡作用不显著；（3）对流层上干下湿的特征越明显，强雷电发生的概率越大；（4）CAPE〉632J/kg，K〉34℃，Si〈0℃，Li〈0℃，TT〉43℃，SSI〉43可以作为江西致灾雷电发生的阈值，超过阈值越多，强对流天气发生的概率越大；（5）能量参数的演变对致灾雷电的潜势预测、强度判别具有较好的指示，夏季对流参数的指示意义较春季更好。
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| 关 键 词： | 不稳定指数 强雷电 热力条件 天气形势 |
THE CONTRAST OF THERMAL CONDITION AND INSTABILITY INDEX FOR THUNDERSTORM IN SUMMER OF JIANGXI |
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| Zheng Jing,Xu Aihua,Ying Dongmei,Liu Fang.THE CONTRAST OF THERMAL CONDITION AND INSTABILITY INDEX FOR THUNDERSTORM IN SUMMER OF JIANGXI[J].Meteorology and Disaster Reduction Research,2009,32(2):27-32,F0003. |
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| Authors: | Zheng Jing Xu Aihua Ying Dongmei Liu Fang |
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| Institution: | (Jiangxi Provincial Meteorological Observatory, Nanchang 330046, China) |
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| Abstract: | Two severe thunderstorms happened in summer 2007 of Jiangxi are analyzed, and their energy parameters are compared with those of typical historical cases. The results show that （ 1 ） The differences of subtropical high, movement speed of 500 hPa trough, mesoscale convergence system and thermal structure are the causes of different thunderstorm intensity. （2） When the mesoscale convergence system moves through Poyang Lake the convective weather will be severer, while the blocking effect of Poyang Lake on large-scale system is not obvious. （3） The drier the upper air is or the wetter the lower air is, the more probably the severe thunderstorm happens. （4） Under the conditions of CAPE〉632 J/kg, K〉34 ℃, Si〈0 ℃, Li〈0 ℃, TT〉43 ℃ and SSI〉43, severe thunderstorm may happen in Jiangxi. （5） The evolution of energy parameter is a better indicator for the potential forecast and intensity of thunderstorm. Forecast for summer thunderstorm with convective parameter is better than that for spring thunderstorm. |
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| Keywords: | Instability index Severe thunderstorm Thermal condition Weather situation |
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