河北省一次回流暴雪的数值模拟  

Numerical simulation on a return-flow snowstorm process in Hebei province

作　　者：宋晓辉[1] 田利庆 田秀霞[1] 马鸿青[3] 张功文[1] 董方亮[1] 

机构地区：[1]邯郸市气象局,河北邯郸056001 [2]河北省气象局,河北石家庄050021 [3]保定市气象局,河北保定071000

出　　处：《气象与环境学报》2013年第3期8-14,共7页Journal of Meteorology and Environment

基　　金：国家自然科学基金(40875024);河北省自然科学基金(D2008001282)共同资助

摘　　要：应用WRFV3.2.1中尺度数值模式,利用每日4次1°×1°的NCEP-FNL全球分析场资料,对2009年11月9—12日河北省回流暴雪过程进行数值模拟,并利用模式输出的时空分辨率较高的资料,对冷流暴雪特征及其物理机制进行分析。结果表明:暴雪区近地层为干冷气团形成的冷垫,暖湿气流沿锋面上界自低层向高层输送,暴雪的出现与高温高湿能量的输送密切相关,水汽主要来自南方;近地层以辐散和反气旋性涡度为主,上升运动的加强与中尺度对流云团的活动相对应,受太行山地形影响降水强度加大。Using the WRFV3.2. 1 mesoscale numerical model, a return-flow snowstorm process occurred on No- vember 9-12,2009 in Hebei province was analyzed based on the 1°×1° NCEP-FNL reanalysis data four times a day. The characters of the return-flow snowstorm and its physical mechanism were discussed according to the prod- ucts from the above model. The results indicate that the surface ground is cold cushion generated by dry and cold air mass. The warm-wet airflow transports from the lower level to upper level along the upper boundary of front surface. The occurrence of snowstorm is related with transportation of high temperature and high humidity energy, and water vapor is mainly from the south. Anticyclone and divergence area is main area near the ground surface, and strenBth of ascending motion corresponds to the activities of mesoscale convective cloud mass. The rainfall in- tensity increases because of the effect of topography of Taihang Mountain.

关 键 词：回流暴雪 数值模拟 诊断分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]