摘要
以2019年6月9—10日永安地区的大暴雨为例,综合分析与本次暴雨相关的环流背景和中尺度对流系统特征及物理量场特点。结果显示,本次暴雨孕育于副热带高压北部边界和低空切变南部暖区内,500 hPa中高纬度为一脊一槽,低层850 hPa流场特征为西南暖湿气流、北印度洋暖湿气流和东向路径冷空气三股气流的结合。东侧冷平流的持续输入和低空急流的发展导致对流层结构不稳定加剧,易出现强对流天气。700 hPa和850 hPa等压面的湿位势涡度负值中心和强降水中心有很好的对应关系,说明湿对称、对流和斜压不稳定均对强降水系统的演变产生重要作用。
Taking the heavy rain in Yong’an area from June 9 to 10,2019 as an example,the circulation background,mesoscale convective system characteristics and physical quantity field characteristics related to the heavy rain are comprehensively analyzed.The results show that the rainstorm was bred in the northern boundary of subtropical high and the southern warm region of low-level shear.At 500 hPa,there are one ridge and one trough in the middle and high latitudes.At 850 hPa,the flow field features the combination of southwest warm and humid air flow,North Indian Ocean warm and humid air flow and East path cold air flow.The continuous input of the East cold advection and the development of the low-level jet aggravate the instability of the tropospheric structure,which leads to severe convective weather.The negative value center of moist potential vorticity on 700 hPa and 850 hPa isobaric surface has a good corresponding relationship with the center of heavy rainfall,which indicates that moist symmetry,convection and baroclinic instability all play an important role in the evolution of heavy rainfall system.
作者
翁贤东
WENG Xian-dong(Yong’an Meteorol�ogical Bureau,Yong’an,Fujian 366000)
出处
《农业灾害研究》
2021年第4期64-65,共2页
Journal of Agricultural Catastrophology
关键词
永安市
强降雨天气
过程分析
Yong’an City
Heavy rainfall weather
Process analysis
