孝感市一次春季强寒潮天气过程分析  

Analysis of a Strong Cold Wave Weather Process in Spring in Xiaogan City

作　　者：邓凯 罗金芳 张慧娟 DENG Kai(Xiaogan Meteorological Bureau of Hubei Province,Xiaogan Hubei 432000)

机构地区：[1]湖北省孝感市气象局,湖北孝感432000

出　　处：《农业灾害研究》2020年第4期52-54,57,共4页Journal of Agricultural Catastrophology

摘　　要：利用常规天气观测资料、GRAPES_GFS模式高分辨率(0.25°×0.25°)再分析格点资料,对2020年3月26—28日湖北省孝感市强寒潮天气过程进行分析。结果表明:此次强寒潮天气过程出现在北半球中高纬环流形势由纬向型向经向型转换过程中,乌拉尔山阻高和横槽的建立为冷空气的输送和聚积提供必要条件;乌拉尔山阻高崩溃和蒙古低涡竖槽的东移,引导地面冷空气从东路南下,造成了此次强寒潮天气过程。此过程出现在一个非典型的倒Ω流型中,且乌拉尔山阻高维持时间短,横槽无明显转动(只是减弱南压直至消失),蒙古低涡竖槽与横槽明显分离,这些是此次寒潮过程的基本特点。在低空强盛的东北急流和北方强大的冷平流持续共同作用下,造成孝感市气温急剧下降。在低空急流动量下传、梯度风和变压风的共同作用下,造成了孝感市大范围大风天气。Using conventional weather observation data and Re-analysis of grid data for GRAPES_GFS model high resolution(0.25°×0.25°),The weather process of strong cold wave in Xiaogan City,Hubei Province from March 26 to 28,2020 was analyzed.The results show that:The Strong cold wave weather process occurred during the transition process of the circulation pattern from latitudinal to meridional in the mid—high latitude of the Northern Hemisphere,The establishment of the blocking high of Ural Mountain and horizontal trough provide necessary conditions for the transportation and accumulation of cold air,Collapse of the blocking high of the Ural Mountains and eastward movement of the Mongolian vortex vertical trough,Steering the ground cold air down from the south of East Road,It caused the strong cold wave weather process.This strong cold wave process appears in an atypical inverted Omega flow pattern,And the holding time of the blocking high of Ural Mountain is short,The horizontal trough does not rotate significantly(It just weakens and moves south until it disappears),the Mongolian vortex vertical trough and horizontal trough are separated obviously,These are the basic characteristics of this cold wave process.Under the sustained joint action of the strong northeast jet stream at low altitude and the strong cold advection in the north,It caused the temperature of Xiaogan to drop sharply.Under the joint action of low—level jet stream momentum down flow,gradient wind and variable pressure wind,It caused a large scale gale weather in Xiaogan City.

关 键 词：强寒潮 强降温 强风 成因分析 

分 类 号：P458.3[天文地球—大气科学及气象学]