2008年2月29日影响内蒙古西部地区一次沙尘天气过程分析  

A Process' Analysis of Sand-Dust Weather at Western of Inner Mongolia in February 29,2008

作　　者：德勒格日玛 韩经纬 兰斌[2] 安莉娟[3] 

机构地区：[1]内蒙古气象台,内蒙古呼和浩特010051 [2]化德县气象局,内蒙古化德013364 [3]内蒙古气候中心,内蒙古呼和浩特010051

出　　处：《内蒙古气象》2011年第2期5-8,共4页Meteorology Journal of Inner Mongolia

摘　　要：利用常规观测资料和MICAPS提供的相关资料,对2008年2月29日至3月1日在我区阿拉善盟、巴彦淖尔市西部、鄂尔多斯市西部发生的区域性沙尘暴天气的环流形势及物理量进行分析。分析表明:(1)本次沙尘暴过程基本属于蒙古气旋和干冷锋混合型,有利的气候背景是本次沙尘暴的基础。(2)影响这次沙尘暴天气的高空急流主要是250hPa附近的西风急流,较强西风急流通过动量下传引起地面大风,造成地面减压,促进了蒙古气旋的发展,从而促进了沙尘暴的发展。(3)在40～45°N,95～109°E整层强烈辐合、上升造成很强的抽吸作用可导致强烈辐合,在近地面形成大风和沙尘的扬起提供了较好的条件。This paper analyzed circulation and physical characteristics of regional dust storm weather process from Alaxa league,west of Bayannur league and Erdos city of Inner Mongolia using the routine observation data and related information provided by MICAPS from Feb 29,2008 to March 1.Conclusion is that this dust storm process belong to mixed type of Mongolian cyclone and dry cold front,favorable climate background is the basis of this dust storm process,mainly strong 250hPa westerly jet cause surface gale and reduce pressure,accelerate the development of Mongolian cyclone through momentum descending directly,thus promote the development of sand-dust storm,On region of 40o～45oN,95o～109oE,pumping action caused by strong convergence and vertical ascending motion of the whole layer lead to stronger convergence,strong wind near the surface and provide better condition for sand dust raising.

关 键 词：沙尘暴 蒙古气旋 高空急流 

分 类 号：P445.4[天文地球—大气科学及气象学]