连续两年丹东地区春季暴雪过程对比分析

利用常规高空和地面形势场资料对2012和2013年的2次春季暴雪过程进行对比分析,结果表明,中高纬脊前冷空气不断补充,促使浅槽加深东移,低空西南急流建立,均为丹东地区暴雪提供有利环流背景和动力、水汽条件;地面倒槽顶部暖切变以及蒙古低压槽前切变是暴雪直接影响系统;中低层温度的分析是春季降雪预报的关键点,前期冷空气波动以及各层温度的垂直变化,尤其是低层逆温层的分析,均可以为判断降雪相态预报提供依据。

Comparative Analysis of Twice Spring Snowstorms in Dandong for Two Consecutive Years

Based on the normal high and surface data, the spring snowstorms in 2012 and 2013 were comparatively analyzed. The result showed that the advantageous circulation background, motivation and water vapor condition for the snowstorms were supplied by the trough deepened by supplement of the cold air in front of the ridge in middle-high latitude and low level southwest jet stroam established. The warm shear at the top of the surface inverted trough and the shear in front of the Mongolia trough directly impacted the twice snowstorms. The tem- perature in the middle and low level was the key point for spring snows. The temperature fluctuations in the earlier stage and the vertical tem- perature change on different level, especially the inversion layer on low level, which could provide evidence for snow phase.