我国北方地区一次沙尘暴天气特征分析  

An Analysis on Sand Storm Weather Characteristic in Northern China

作　　者：孙燕[1] 沈桐立[1] 李强[2] 侯润兰[2] 宋晓亚[2] 

机构地区：[1]南京信息工程大学,江苏南京210044 [2]山西省气象科技服务中心,山西太原030006

出　　处：《沙漠与绿洲气象》2007年第2期6-9,15,共5页Desert and Oasis Meteorology

摘　　要：使用美国大气中心6h一次的NCEP再分析格点资料(1.0°×1.0°)对2002年3月18—22日发生在我国北方的大范围沙尘暴天气成因进行分析。从环流形势、物理量诊断、高空急流等方面进行研究分析,结果表明:蒙古气旋是这次沙尘暴天气的主要影响系统,这次气旋发生发展在斜压区,气旋的发展阶段温度平流作用明显。沙尘暴过程主要是由气旋冷锋及锋后地面大风触发的,地面大风的形成与气旋发展、锋后冷平流及高空急流动量下传有关。Based on the NCEP/NCAR 6 hours Reanalyzed data,we analyzed the synoptic causes of the sandstorm weathers occurred in March 18-22,2002. By analysis of atmospheric circulation, diagnosis of physical quantity, study of the upper-level jet stream, the results indicated that the Mongolian cyclone is a major effect system of the sandstorm weather, the occurrence and the development of cyclone commenced in baroclinicity region, the main contribution to the intensification of cyclone came from the thermal advection,it is must not be overlook the function of the atmospheric baroclinicity.This sandstorm weather case was mainly caused by cyclone cold front and the surface high wind behind the cold front.The formation of the surface strong wind is caused by the cyclogenesis,clod advection behind the cold front and the downwardly transmission of the upper-level jet momentum.

关 键 词：沙尘暴 蒙古气旋 温度平流 高空急流 

分 类 号：P425.55[天文地球—大气科学及气象学]