江苏一次灾害性大风天气过程分析

Analysis of a Damaging Wind Event in Jiangsu

利用江苏省自动站、NCEP再分析资料和连云港多普勒雷达等资料,对2017年3月1日江苏一次大范围灾害性大风过程进行了分析。结果发现,此次大风过程是黄河气旋后部冷锋迅速加强南下引起的一次系统性大风过程,具有明显的温度槽落后于高度槽的斜压结构,槽后急流和冷平流显著。强三小时正变压引起的变压风是阜宁产生大风的主要原因。此外,云台山地形造成的冷锋加强也对阜宁大风有一定的加强作用。

Based on the data from weather stations in Jiangsu Province,NCEP/NCAR reanalysis data,and Doppler radar from Lianyungang,a gale which caused damage in Jiangsu Province on 1 March 2017 was analyzed.The results show that the gale in this case is a systematic gale caused by a cold front behind the Yellow River cyclone.The structure of the cyclone was baroclinic,and the thermal trough fell behind the height trough.The jet and the cold advection behind the height trough was strong.The main reason that the gale occurred in Funing was the allobaric wind which resulted from 3-hours of positive isallobars.In addition,the enhancement of the cold front resulted from the Yuntai Mountain,which also had a role in strengthening the gale.