2018年3月中旬吉林省一次暴雪过程分析

本文利用NCEP 再分析资料、台站观测资料、多普勒雷达资料等对2018 年3 月14~15 日出现 在吉林省的暴雪天气过程进行分析。结果表明:在暴雪天气出现之前，平直的纬向环流有能量集聚， 再加上后期环流的调整和有效位能转换为动能，且释放了大量能量，充足的动力和能量条件，有利于 暴雪天气的出现；这次的暴雪天气大的气候背景是冬季气温较高，且暴雪天气出现前一天的地面温度 较高，说明暴雪天气出现前的有能量储备较为充足；在降雪天气出现之前的触发机制是偏东急流，在 提供水汽的同时，还提供了触发条件；再加上偏北气流低

Analysis of a snowstorm in Jilin Province in the middle of March 2018

In this paper, NCEP reanalysis data, station observation data and Doppler radar data are used to analyze the blizzard process in Jilin Province from March 14 to 15, 2018. The results show that before the oc? currence of Blizzard, there is energy concentration in the straight zonal circulation, coupled with the adjust? ment of circulation and the conversion of effective potential energy into kinetic energy in the later period, and a large amount of energy is released. Sufficient power and energy conditions are conducive to the occurrence of blizzard; the climate background of this blizzard is the higher temperature in winter, and the ground tem? perature of the day before the occurrence of blizzard High, indicating that there is sufficient energy reserve before the occurrence of blizzard; the triggering mechanism before the occurrence of snowfall is the easterly jet, which not only provides water vapor, but also provides triggering conditions; in addition, the intrusion of the northerly low-level air flow strengthens the instability conditions, and there are strong disturbances, which provides the dynamic conditions for the occurrence of blizzard.