一次东北冷涡暴雨的成因分析  

Cause Analysis of a Northeast Cold Vortex Rainstorm

作　　者：赵旻 Zhao Min(Jining District Meteorological Bureau,Ulanqab,Inner Mongolia,012000)

机构地区：[1]内蒙古乌兰察布市集宁区气象局,内蒙古乌兰察布012000

出　　处：《农业灾害研究》2023年第1期106-108,共3页Journal of Agricultural Catastrophology

摘　　要：利用常规观测资料、MICAPS资料、NCEP/NCAR1°×1°逐6 h再分析资料,从热力动力条件、层结条件等方面,对2022年6月4—5日内蒙古东南部地区的一次东北冷涡暴雨过程进行诊断分析,得出产生暴雨的天气尺度和中尺度系统特征。结果表明:此次暴雨是由东北冷涡前部暖湿切变造成的,鄂霍次克海阻塞高压阻挡,使冷涡移动缓慢,冷涡系统影响时间长、降水量增大。暖湿空气在切变处强烈辐合,与高低空急流耦合产生的次级环流上升支重合,地面中尺度切变线为暴雨云团的发展与维持提供了有利条件。低层强辐合区与高层强辐散区重合,为暴雨产生提供了动力条件;低空偏南急流为暴雨提供了充沛的水汽条件,同时低层增温增湿使大气层结不稳定。By using the conventional observation data, MICAPS data, NCEP/NCAR 1 ° × 1 ° and reanalysis data every 6 hours, from the thermodynamic dynamic condition, stratification condition and so on, a northeast cold vortex rainstorm in southeastern Inner Mongolia on June 4-5, 2022 was diagnosed and analyzed, and the synoptic scale and mesoscale system characteristics of the rainstorm were analyzed.The results show that the torrential rain was caused by the warm and wet shear in front of the northeast cold vortex. The cold vortex moved slowly because of the sea of okhotsk blocking and high pressure blocking. The warm moist air converges strongly at the shear and coincides with the upwelling branch of the secondary circulation generated by the coupling of the upper and lower jet streams.The strong convergence area at the lower level and the strong divergence area at the upper level provide the dynamic conditions for the rainstorm, while the south jet at the lower level provides the abundant moisture conditions for the rainstorm, and the warming and humidifying at the lower level make the atmospheric stratification unstable.

关 键 词：东北冷涡 中尺度切变线 低空急流 次级环流 暴雨 

分 类 号：P458[天文地球—大气科学及气象学]