摘要
通过利用NCEP再分析气象资料和闪电定位系统监测资料对2007年云南主要致灾雷电过程进行对比诊断分析,结果表明:尽管雷电活动和导致的雷击灾害的地域差异较大,但频繁的雷电活动是导致雷击灾害的主要原因;云南雷电活动区域与高CAPE区域具有较好的对应关系,雷电一般发生在CAPE≥200J/kg的区域内,另外上升下沉气流之间形成的稳定垂直环流、倾斜深厚上升气流以及中低层上升气流、高层下沉气流的大气垂直结构非常利于云南雷电形成和雷击灾害事件发生,雷电易发区域从低层到高层垂直速度小于-1.0hPa/s,并且对流有效位能越大、上升运动越强烈,越有利于雷电产生和雷击灾害发生。
By using NCEP,meteorological data and monitoring data of the lightning location system ar reanalyzed to compare and analyze main disaster-causing lightning processes in Yunnan in 2007. Results show tha although regions of thunder activity and lightning strike disaster are very different,frequent thunder activity is th major factor to lightning strike disasters. Lightning activity region of Yunnan is in good correspondence with th high CAPE region,and thunder takes place commonly in region of CAPE ≥200 J/kg. Furthermore,a stabl vertical circulation formed in updraft and downdraft,a tilt and deep updraft and an atmospheric vertical structure o middle-level and low-level updraft and high-level downdraft tend to induce lightings and lightning strike disasters Vertical velocity of lightning from the lower level to the higher level in the easy-happening area is lower tha - 1. 0 hPa/s,and greater convective available potential energy and stronger ascending motion induce lightning an lightning strike disasters more easily.
出处
《灾害学》
CSCD
2010年第3期6-11,共6页
Journal of Catastrophology
基金
云南省科技攻关项目(2009CA014)"低纬高原雷电自动预警预报方法的研究和应用"
大气探测重点开放实验室项目"雷电监测数据和气象雷达数据预警雷电的方法研发"
中国气象科学研究院合作项目"云南省雷电活动特征分析和雷电临近预警方法研究"
关键词
云南
致灾
雷电过程
大气物理量
结构特征
Yunnan province
disaster-causing
lightning process
atmospheric physical factors
structura characteristics
