【摘要】 利用NCEP 1°×1°的6 h再分析资料与高空地面观测资料,对2005年12月4日山东半岛出现的罕见区域性暴雪过程进行分析。结果表明:冷涡后横槽影响是造成大范围暴雪的主要天气系统,黄、渤海为大暴雪提供了充足的水汽来源,低层辐合、高层辐散有利于产生大范围强烈的上升运动;途经海面的强冷平流带来丰富的水汽,是造成大暴雪的最终原因。通过对湿位涡的分析发现,暴雪落区与MPV2负值中心有很好的对应关系。更多还原

【Abstract】 Based on the routine observational data as well as data of NCEP reanalysis and moist potential vortex,this whole terra snowstorm event is investigated on December 4,2005 in Shandong peninsula.The results show that this snowstorm is mainly resulted from transverse trough behind cold eddy.Yellow Sea and Bohai Sea provide abundant water vapor;the upper level divergence and the low level convergence increase ascending movement.Cold advection coming from sea surface brings abundant water vapor production,which is the ultimate cause.MPV2 being the horizontal component of moist potential vortex has coincidence relation with the negative center.更多还原