摘要
[目的]分析山东半岛一次冷流降雪过程。[方法]利用常规天气观测资料、NCEP/NCAR 1°×1°网格点逐6 h再分析资料,采用天气学原理和天气动力学诊断分析方法,对2008年12月4～6日山东半岛冷流降雪进行分析和总结。[结果]造成此次山东半岛冷流降雪的大尺度环流形式为冷涡深槽;850 hPa西北风风力增强时,山东半岛冷流降雪将加强;暴雪发生时,925～750 hPa相对湿度>90%,90%相对湿度线所围成的面积大小与强降雪时段有较好的对应,相对湿度线的变化反映了海面暖湿水汽往高处输送的变化,海平面暖湿水汽往高空输送越多,越有利于山东半岛冬季冷流降雪的形成;冷流降雪具有明显的时空分布特征,并与垂直上升运动区相对应。[结论]该研究为山东半岛冷流降雪的短时和临近预报准确率的提高提供了一定的参考。
[Objective] One cold flow snowfall in Shandong Peninsula was analyzed.[Method] Using conventional weather observation data,the NCEP/NCAR 1°×1° grid point by 6 h in data analysis,the synoptic weather dynamics principle and diagnosis analysis method,the cold airflow snowfall in Shandong Peninsula on December 4,2008 to 6 was analyzed and summarized.[Result] The results showed that the cold deep groove of large scale circulation caused the cold airflow snowfall in Shandong Peninsula.While the 850 hPa mistral wind strengthened,cold flow snow in Shandong Peninsula will be strengthened.During the eruption of snowstorm,the relative humidity from 925 to 750 hPa was larger than 90%.The area formed by 90% relative humidity line corresponded with the period of heavy snowfall.The changes of relative humidity line reflected the changes of warm and wet air transporting to the higher place.The more warm and wet air being sent to the upper air,the more conductive to the formation of cold flow snowfall in Shandong Peninsula.The cold flow snowfall had distinct temporal and spatial distribution characteristics and corresponded with the vertical increasing movement zone.[Conclusion] The study provided reference for the preciseness of short term and coming report of cold flow snowfall in Shandong Peninsula.
出处
《安徽农业科学》
CAS
2012年第4期2273-2274,2285,共3页
Journal of Anhui Agricultural Sciences
基金
山东省科技厅科技攻关项目(2010GSF10805)
关键词
冷流降雪
山东半岛
相对湿度
上升运动
Cold flow snowfall
Shandong Peninsula
Relative humidity
Ascending motion
