摘要
对呼和浩特机场2002-2016年近15年降雪过程的环流形势特征进行归纳分类,结果表明:降雪的天气过程环流形势可分为两类六型,强冷空气类分为贝加尔湖气旋低槽型,蒙古气旋低槽型和西来斜压槽型三种,弱冷空气类分为槽涡型,切变型和北槽南涡型三种。弱冷空气类降雪一般有南支暖湿系统配合,遇弱冷空气抬升造成降雪天气,强冷空气配合典型天气系统造成强降雪天气的同时,还会伴随有大风、吹雪、沙尘、寒潮等天气的出现。降雪量的大小与冷空气的强弱程度无必然联系。强降雪天气一般在700hPa均伴随有10m/s以上的低空偏南急流。
The circulation situation characteristics of Hohhot airport are summarized and classified during the past 2002-2016 years in recent 15 years.The results show that the circulation pattern of snowfall weather process can be divided into two types and six patterns.The strong cold air type is divided into the Lake Baikal cyclone trough pattern,the Mongolia cyclone low trough pattern and the west oblique baroclinic pattern,and the weak cold air type is divided into the trough vortex pattern,the shear pattern and the North trough South vortex pattern.Weak cold air snowfall generally has the cooperation of warm and humid system in the South branch.When the weak cold air is lifted,it will cause snowfall.When the strong cold air cooperates with typical weather system,it will cause strong snowfall.At the same time,it will also accompany gale,snow blowing,dust,cold-air outbreak and other weather.There is no direct correlation between the amount of snowfall and the intensity of cold air.Heavy snowfall usually occurs at 700hPa accompanied by a low-level southerly jet over 12 m/s.
作者
李浩
Li Hao(Civil Aviation Inner Mongolia Air Traffic Control Branch,Hohhot Inner Mongolia 010070,China)
出处
《环境与发展》
2019年第11期162-164,共3页
Environment & Development
关键词
降雪
环流形势
槽线
低空急流
Snowfall
Circulation situation
Trough
Low-level jet
