摘要
应用基本气象资料,对2010年4月24—25日阿拉善盟强沙尘暴天气过程进行了天气和动力诊断分析。结果表明:气旋后部有强冷暖空气交汇,造成水平温度梯度增大,从而加大了垂直切变偏差风。同时,强变压梯度和强斜压性形成了变压风,引起了不稳定能量的释放,从而引发地面大风,产生强沙尘暴。高空急流的活动会促使下沉运动,有利于地面气旋加强,造成低层辐合,高层辐散,非常有利于对流的发生与发展。
By using the basic meteorological observations data,the synoptic causes and forcing mechanism of the strong sandstorm weather process on April 24,2010 in Alxa League were analyzed.The result showed that： the stronger cold and warm air gathered at the tail of cyclone,and caused the strong horizontal temperature gradient,and then increased the vertical shear of wind.Meanwhile,because the strong allobaric gradient and strong baroclinicity formed allobaric wind,and release unstable energy,to lead to raising high wind on ground and develops strong sandstorm.The activities of upper-level jet stream strengthen the cyclones,cause convergence of low level and divergence of upper level,it is helpful to the occurrence and development of the convection.
出处
《内蒙古气象》
2011年第2期13-15,共3页
Meteorology Journal of Inner Mongolia
关键词
强沙尘暴
高空急流
热力因子
strong sandstorm
upper-level jet stream
thermodynamic factors
