摘要
利用NCAR/NCEP全球再分析资料,对宁夏一次(2009-04-23)区域性沙尘暴天气的环流背景及高、低空影响系统进行了分析,重点研究了触发和维持该次沙尘天气的热力及动力条件.结果表明,蒙古冷涡及其后部的横槽为该次沙尘天气提供了有利的环流背景;蒙古气旋及地面锋面是导致沙尘暴爆发的直接原因;水平和垂直方向上的高能量锋区为该次沙尘天气提供了强热力条件;高、低空急流的耦合是沙尘天气出现和维持的动力条件;次级环流的存在是沙尘天气维持和发展的动力保障.对沙尘暴天气过程的预报预警、防灾减灾具有重要的指导意义。
Using NCAR/NCEP global reanalysis data,the circulation background and effect system of high and low altitude was analyzed on a regional sand storm on Apr 23rd,2009 in Ningxia,and thermal and dynamical condition which triggered and kept the dust storm was emphasized.Results show that,Mongolia cold vertex and it＇s rear transversal trough provided advantageous circulation background for the dust weather,and Mongolia cyclone and frontal surface is direct reason of sand storm outbreak;high energy frontal zone on horizontal and vertical direction provided intensive thermal condition for the dust weather;one of the dynamical condition for occurrence and maintenance of the dust storm is coupling of the upper and lower jet,and sublevel circulation is another dynamical condition.It is important and significance to sand storms warning,disaster prevention and mitigation.
出处
《宁夏工程技术》
CAS
2010年第2期97-100,共4页
Ningxia Engineering Technology
关键词
沙尘暴
高、低空急流
热力
动力
sand storm
upper and lower jet
thermal
dynamical
