摘要
应用 3种不同的中尺度分离方法对陕西中南部一次突发性暴雨资料进行中尺度分离 ,结果表明 :3种方法都能从高空常规测站资料中分离出 2 0 0km以上的中尺度系统 ,选择滤波方法对低层中尺度系统分离效果较好 ,站点滤波方法简单易行 ,中层分离效果较佳 ,9点滤波方法中低层均适用 ,所滤得的中尺度辐合系统处于暴雨区上游。
Separation of the mesoscale flow field of an abrupt rainstorm in the central and southern parts of Shaanxi was conducted with three various mesoscale filtering methods. It is shown that there exist mesoscale vortexes or convergence lines in the lower atmosphere over the corresponding precipitation zone when an abrupt rainstorm happens. All the mesoscale systems from 200 to 1200 km can be separated from conventional radiosonde data. The selection filter is good for separating the low-level mesoscale systems;the station filter is simple,feasible and suitable for the middle-level;and the 9-point filter is applicable to both,whose filtered mesoscale convergence system is situated on the upstream side of the rainstorm zone.
出处
《气象科技》
北大核心
2004年第2期65-70,共6页
Meteorological Science and Technology
基金
陕西省 2 0 0 1科技计划项目 (2 0 0 1k0 9 G7)资助
