摘要
利用常规观测资料以及中尺度数值模式MM5V3.7的模拟结果,对2007年3月3—5日东北地区罕见暴雪过程成因进行了分析。结果表明:高低空垂直切变明显和高层辐散与低层辐合相配置导致的强上升运动,以及中低层深厚的正涡度产生和维持是强暴雪形成的动力机制;干冷空气侵入是产生暴雪的触发因素;北上低涡东侧的偏南气流携带来自东海和南海两个源地的充沛水汽直抵东北地区,是产生东北暴雪的重要原因之一。
Based on the routine observational data and the result of the Meso-scale Model （MMSV3.7） simulation, the cause of snowstorm process in northeast of china in Mar. 3-5, 2007 was analyzed. The results indicate that vertical shear of upper and lower air and strong ascending caused by upper air divergence and lower air convergence, as well as the generation and maintenance of mid-lower air positive vorticity are the dynamical mechanism, and the cold and dry air invasion is the trigger factor. Profuse water vapor from East Sea and South Sea with northward airflow from south at east of cyclone is the important reason of snowstorm.
出处
《气象》
CSCD
北大核心
2008年第4期30-38,共9页
Meteorological Monthly
基金
中国气象局气象新技术推广预报员专项(CMATG2008Yol)
灾害天气国家重点实验室开放课题资助
关键词
暴雪
大尺度环流形势
数值模拟
snowstorm macro-scale circular situation numeric simulation
