摘要
在分析环流背景、影响系统及诸层物理量场特征基础上,结合M ICAPS资料和NCEP 1°×1°的6 h再分析资料,对2007年3月初唐山暴雪天气过程进行了诊断分析。结果表明,加深的高空槽、700 hPa低涡及东北平原回流的强冷空气是这次暴雪的主要影响系统,降雪期间的高空辐散低层辐合、正涡度的增强、较强的上升运动以及冷空气强迫抬升是暴雪发生的动力机制,低层持续的偏东风是主要水汽输送通道,700 hPa的Q矢量辐合区与降雪落区有较好对应关系。
Based on analysis of circulation background, influencing system and the characteristics of physical quantity fields on each layer, the diagnostic analysis was performed on the weather process of the snowstorm happened in Tangshan Region during 3 to 4 March in 2007 by using MICAPS data and NCEP 1° × 1° 6 - hour interval reanalyzed data. The results are as follows：the deepening upper trough, the vortex at 700 hPa layer and the intensive cold air were main influencing systems that cause the snowstorm weather process; the divergence at high level and convergence at low level, the enhanced positive vortex, the strong ascending motion and the warm air forced to lift by cold air were the important dynamic mechanism of this weather event ; the vapour transport came from the deflection east airstream at the low layer; and the Q - vector convergence at 700 hPa correlated to the area of snowstorm＇ s occurrence, which can be used as an indicator in forecasting snowstorm weather.
出处
《干旱气象》
2009年第2期135-141,共7页
Journal of Arid Meteorology
关键词
暴雪
诊断分析
Q矢量
唐山
snowstorm
diagnostic analysis
Q - vector
Tangshan
