【摘要】 利用广东省清远地区2011、2012和2014年6—8月地闪定位资料将每天发生的雷暴情况进行分级,并结合对应的探空资料,计算对流有效位能、沙氏指数、K指数等反映大气稳定性或能量关系的参数,分析其在发生时间和强度不同的雷暴发生前的分布情况。结果表明,沙氏指数、抬升指数、K指数、全总指数、强天气威胁指数和对流有效位能与雷暴强度有一定的相关性,而对流抑制能量、粗理查森数与雷暴强度间没有发现较好的相关性。广东地区雷暴发生前沙氏指数小于0℃,抬升指数小于-2℃,K指数大于30℃,对流有效位能大于500J/kg,更容易产生中强雷暴。广东地区的K指数高于青藏高原地区20℃左右,对流有效位能的平均值高于青藏高原及陕甘宁地区约300J/kg,其余参数分布特点与部分地区相似,进一步反映了广东地区雷暴特征的特殊性,加深了对广东地区雷暴特征的认识。更多还原

【Abstract】 The thunderstorm strength from June to August in 2011,2012 and 2014 is classified by using the data of lightning location in Qingyuan,Guangdong Province,combined with the radiosonde data,calculating some parameters that can reflect the stability or energy relationships of the atmosphere,such as the Convective Available Potential Energy,Showalter index and K index and so on.Then we analyze the distribution of these parameters before the occurrence of the different intensity thunderstorms in different time.The results show that the Showalter index,Lifted index,K index,Total Totals index,SWEAT index and Convective Available Potential Energy have a certain correlation with the intensity of thunderstorms,while Convective Inhibition,Bulk Richardson Number and the intensity of thunderstorms are not found to be well correlated.Among them,the Showalter index before the occurrence of thunderstorms in Guangdong is less than 0℃,the Lifted index less than-2℃,the K index greater than30℃,and the Convective Available Potential Energy greater than 500 J/kg,which is more likely to produce moderate to strong thunderstorms.At the same time,the K index in Guangdong is about 20 ℃higher than that in the Tibetan Plateau,and the average value of Convective Available Potential Energy is about 300 J/kg higher than those in the Tibetan Plateau and Shaanxi,Gansu,Ningxia.The distribution characteristics of other parameters are similar to those in some regions,which further reflect the particular characteristics of thunderstorms in Guangdong and help to understand the characteristics of thunderstorms in Guangdong.更多还原