摘要
利用常规气象探测资料、欧洲中心ERA5再分析资料、多普勒雷达资料和微波辐射计资料,对2020年6月25日出现在河北地区的强对流天气过程进行分析。结果表明:(1)河北地区这次强对流天气属于西北气流型冰雹,高低空急流和地面冷锋的共同作用为冰雹天气的出现提供了动力和热力条件;(2)在冰雹天气出现的过程中,6.0°仰角反射率因子图中存在三体散射和旁瓣回波,大冰雹特征极为明显;(3)2 km高度以下的整层大气相对湿度大值区较为集中,而2 km高度以上的相对湿度数值偏小,整层大气以上干下湿的结构为主,这种不稳定层结的分布形势为对流风暴的发展加强提供了有利条件。
The process of severe convective weather over Hebei on June 25,2020 was analyzed by using conventional meteorological observation data,ERA5 reanalysis data,Doppler radar data and microwave radiometer data.The results showed that:(1)the strong convective weather in Hebei area belongs to the northwest airflow type hail,and the combination of high and low air jet and surface cold front provides the dynamic and thermal conditions for the occurrence of the hail weather;(2)In the process of hail weather,there were threebody scattering and sidelobe echo in the reflectance factor map of 6.0°elevation Angle,and the characteristics of large hail were very obvious;(3)The large relative humidity values of the whole layer of the atmosphere below 2 km were concentrated,while the relative humidity values above 2 km were small,and the structure of the whole layer of the atmosphere was mainly dry and wet.This unstable stratification distribution situation provided favorable conditions for the development and strengthening of convective storms.
作者
郭子晗
张铄
张成影
Guo Zi-han(Tangshan Meteorological Bureau,Tangshan,Hebei 063000)
出处
《农业灾害研究》
2023年第9期103-105,共3页
Journal of Agricultural Catastrophology
关键词
强对流天气
环流形势
层结条件
超级单体
Severe convection weather
Circulation situation
Stratification condition
Supercell
