摘要
利用常规观测资料、NECP再分析资料等,对发生在黑龙江省的一次春季大风天气过程成因进行分析。结果表明:冷空气在高压脊引导下向南移动堆积,在南下过程中有冷空气补充到冷涡中,冷涡不断加强。地面大风主要出现在地面低压的气压水平梯度大值区和冷高压前部(冷锋)的气压水平梯度大值区。500 hPa强冷平流使得地面加压,导致变压梯度加大,变压风加大有利于增强地面风速。较大的垂直风切变和干空气侵入易引起动量下传,使地面风速加强。
Based on observation data and NECP reanalysis data,the causes of spring gale in Heilongjiang Province are analyzed.The results show that under the guidance of the high pressure ridge,the cold air accumulates southward,and in the process of southward descent,the cold air is added to the cold vortex,and the cold vortex strengthens continuously.The surface gale mainly occurs in the high value area of the horizontal gradient of the surface low pressure and the high value area of the horizontal gradient of the front(cold front)of the cold high pressure.The cold horizontal flow acts on the ground wind field through the variable pressure field.The larger vertical wind shear causes momentum downward transmission,which strengthens the ground wind speed.
作者
高梦竹
刘松涛
陈雪
GAO Meng-zhu;LIU Song-tao;CHEN Xue(Meteorological obvervatory of Heilongjiang province,Heilongjiang Harbin 150001;Meteorological service center of Heilongjiang province,Heilongjiang Harbin 150001)
出处
《黑龙江气象》
2019年第4期8-12,共5页
Heilongjiang Meteorology
关键词
大风
冷空气
气压梯度
温度平流
地形
gale
cold air
pressure gradient
temperature advection
topography
作者简介
第一作者:高梦竹(1992-),女,黑龙江省大庆市人,南京信息工程大学,硕士生,助理工程师.
