呼伦贝尔市海拉尔区2021年4月强降雪天气成因诊断分析  

Diagnosis and Analysis of the Cause of Heavy Snow in Hailar District of Hulunbuir City in April 2021

作　　者：吴宏伟 乌尼尔 WU Hongwei(Hailar District Mete-orological Bureau,Hulun Buir City,Inner Mongolia,Hulun Buir 021008)

机构地区：[1]内蒙古呼伦贝尔市海拉尔区气象局,内蒙古呼伦贝尔021008

出　　处：《农业灾害研究》2022年第10期55-57,共3页Journal of Agricultural Catastrophology

摘　　要：利用海拉尔区周围乡镇高空地面常规观测资料,EC细网格500~925 hPa高度、温度、风、海平面气压、比湿、T-log P图等实况资料,结合卫星云图和多普勒雷达监测资料,对2021年4月15—16日呼伦贝尔市海拉尔区强降雪过程进行成因分析。结果表明,500 hPa高空槽不断加深,缓慢东移,为此次暴雪天气提供了源源不断的冷空气。而低层925 hPa的偏南急流满足了水汽与动力条件。暖湿气流沿着冷垫爬升,条件对称不稳定导致的倾斜对流造成了强降雪的发生。暴雪区高层辐散、低层辐合,维持较强的上升运动是该地区形成暴雪的动力机制。Based on the routine observation data of the high altitude ground around the towns in Hailar District,the EC fine grid 500~925 hPa height,temperature,wind,sea level pressure,specific humidity,T-logP map and other realtime data,combined with satellite cloud images and Doppler radar monitoring data,the cause of the heavy snowfall process in Hailar District of Hulunbeier city on April 15—16,2021 was analyzed.The results showed that the 500 hPa trough was deepening and moving eastward slowly,providing a continuous supply of cold air for the blizzard.The southerly jet at 925 hPa in the lower layer satisfies the water vapor and dynamic conditions.The warm and humid air flows climb along the cold mat,and the inclined convection caused by the conditional symmetric instability causes the occurrence of strong snow.The high-level divergence and low-level convergence in the blizzard area,and the maintenance of strong ascending movement were the dynamic mechanism of the formation of blizzard in this area.

关 键 词：暴雪 低空急流 倾斜对流 海拉尔区 

分 类 号：P49[天文地球—大气科学及气象学]