2022年6月20日阿拉善盟一次强降水天气过程诊断分析  

Diagnosis and Analysis of A Heavy Rainfall Weather Process in Alxa League on June 20,2022

作　　者：那仁图雅[1] Narentuya(Alxa League Meteorological Bureau,Alxa League,Inner Mongolia 750306)

机构地区：[1]内蒙古自治区阿拉善盟气象局,内蒙古阿拉善盟750306

出　　处：《农业灾害研究》2023年第5期80-82,93,共4页Journal of Agricultural Catastrophology

摘　　要：利用欧洲中心ERA-5再分析资料和国家站探空资料对阿拉善盟2022年6月20—21日大范围降水天气过程的动力条件、水汽条件、不稳定条件以及降水过程中的中尺度对流特征进行分析。结果表明:充足的水汽条件和700 hPa暖湿切变线的长时间维持是导致本次降水过程的主要原因,对流层中高层相对湿度达到饱和或过饱和有利于降水云系形成;在大气低层前期温度偏高、能量积累条件下,上层干冷空气的侵入是触发对流不稳定的关键因素;地面中小尺度辐合产生的上升运动对强降水及对流产生有一定的触发作用。Analyzed the formation mechanism of large-scale rainfall process in Alxa League from June 20 to 21,2022,mainly through dynamic condition,water vapor conditions,instability conditions as well as mesoscale convective characteristics using by ERA-5 reanalysis dataset and Sounding data from National station.That sufficient water vapor conditions and the long-term maintenance of the 700 hPa warm and humid shear line were the main reasons for this rainfall process.The saturation or supersaturation relative humidity in the middle and upper troposphere was conducive to the formation of rainfall-cloud system.And the invasion of dry and cold airflow in the upper layer was the key factor to trigger the convective instability under the conditions of high temperature and energy accumulation in the early stage.Besides,upward motion caused by the meso-scale convergence in near-surface also contributes to the triggering effect on the formation of rainfall and convection.

关 键 词：水汽条件 动力条件 不稳定条件 中小尺度系统 人工增雨 

分 类 号：P458.121.1[天文地球—大气科学及气象学]