秦皇岛一次降雪天气过程分析及双极化雷达应用

An analysis of a Snowfall Process in Qinhuangdao and Dual-polarization Radar Applyment

利用MICAPS常规资料、EC再分析资料、区域站资料、秦皇岛S波段双偏振雷达资料等,对2020年2月14日一次中到大雪天气过程进行分析,并利用双偏振雷达对降雪相态进行判别。结果表明:此次过程是由高空冷涡、中低层切变线配合地面倒槽产生的一次降雪过程;在预报降水时段内,水汽条件较好,但前期动力条件不足,垂直运动偏弱,导致降水延迟;双偏振雷达协相关系数(CC)产品对粒子相态的判别有较好的效果,结合ZDR和HCL产品,在降水相态观测中更加直观有效。

Based on conventional MICAPS data,EC reanalysis data,hourly observation data of regional station,this paper analyzes a snowfall process in Qinhuangdao on 14 February 2020,and then judged the phase of precipitation particle using S-band dualpolarization radar data.The results show that,the snowfall process was caused by high-level vortex,low-level shera line and inverted trough.The water vapor condition was good while the dynamic condition was not enough at first,so the proess began later than early predicted.Correlation coefficient(CC)product achieved good effect in judging precipitation particle phase,as well as differential reflecticity(ZDR)and hydro classification(HCL)pruducts.