摘要
采用常规和非常规观测资料 ,对一次西南低涡发生、发展过程进行了初步诊断分析 ,结果表明 :( 1 )与自由大气中低涡环流的变化相比 ,边界层内低涡环流的演变表现出非连续性特征 ,且涡区内的对流发展和降水也与此相一致。 ( 2 )大气边界层顶的非平衡动力强迫及 50 0hPa正涡度平流的动力作用对本例低涡的形成和发展有重要贡献。
By using conventional and non conventional observation data, a preliminary study on the formation and development of southwest vortex during 8～10 July 1989 is made. The results show that the circulation evolution of the southwest vortex in PBL displays discontinuity feature in comparision with the case in free atmosphere, but the convection and precipitation in the region of southwest vortex show same feature too and the important factors that affect formation and development of this southwest vortex are the dynamical force of unbalance fields on PBL top and positive vorticity advection on 500 hPa.
出处
《高原气象》
CSCD
北大核心
2000年第2期141-149,共9页
Plateau Meteorology
基金
四川青年科技基金
北大暴雨实验室资助
