摘要
利用闪电定位、天气雷达和大气探空等多源资料,结合海南岛西北部7个区域的自动气象站资料,对2020年在海南岛西北部首次出现的两次雷暴天气过程(2020-02-13—2020-02-14)进行了综合分析,同时对雷暴形成的大气环境要素特征进行了统计.结果表明:两次雷暴所对应的地闪活动和回波强度存在一定的差异,第二次雷暴过程的平均地闪频数和不同阶段的回波强度都较第一次大,但第一次雷暴的正地闪比例较高,达到了46%,第二次雷暴对应的正地闪则只占9%.通过对2月份温度和湿度的日变化统计发现,雷暴活动期间的气温整体要高于晴天和阴雨天的气温,午后气温的增温趋势也更为明显;而在14:00时之前,其相对湿度也是整体高于晴天和阴雨天的相对湿度.探空资料的结果显示,对流有效位能、云底高度以及中层平均相对湿度都可作为指示对流活动的指标,但中层平均相对湿度更为合理.
In our report, based on the data of seven regional automatic weather stations in Northwest Hainan Island, the multi-source data of lightning location, weather radar and atmospheric sounding were used to analyze the two earliest thunderstorms(Feb.13-Feb.14) occurred in the northwest of Hainan Island in 2020, and the characteristics of atmospheric environmental parameters related to the studying thunderstorms were also analyzed. The results showed that there are some differences in the activity and echo intensity of the ground flash corresponding to the two thunderstorms: the average frequency of the second thunderstorm and the echo intensity of different stages are greater than that of the first thunderstorm, however, the proportion of positive ground lightning in the first thunderstorm is 46%, and that of the second thunderstorm is only 9%. According to the statistics of daily variation of temperature and humidity in February, it is found that the temperature during thunderstorm activity is higher than that in sunny and rainy days, and the warming trend of afternoon temperature is more obvious;the relative humidity before 14:00 is also higher than that in sunny and rainy days. The radiosonde data showed that the convection available potential energy, the cloud base height and the average relative humidity of the middle layer can be used as indicators of convective activity, among which the mean relative humidity in the middle layer is more reasonable.
作者
李雨珊
李力园
余海
劳小青
Li Yushan;Li Liyuan;Yu Hai;Lao Xiaoqing(Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China;Meteorological Disaster Prevention Technology Center of Hainan Province,Haikou 570203,China)
出处
《海南大学学报（自然科学版）》
CAS
2021年第1期44-57,共14页
Natural Science Journal of Hainan University
基金
海南省自然科学基金创新研究团队项目(2017CXTD014)
国家自然科学基金(41775011)。
关键词
正地闪
对流有效位能
云底高度
中层平均相对湿度
positive ground flash
convection available potential energy
cloud base height
mean relative humidity in the middle layer
