张掖及兰州榆中地区沙尘气溶胶粒子谱分布的观测研究  

Observational Study on the Particle Size Distribution of Sand Aerosol in Zhangye and Yuzhong of Lanzhou

作　　者：徐鑫强[1] 王鑫[1] 黄建平[1] 

机构地区：[1]兰州大学大气科学学院,甘肃兰州730000

出　　处：《高原气象》2011年第1期208-216,共9页Plateau Meteorology

基　　金：国家科技支撑计划项目(2008BAC40B05);中央高校基本科研业务费专项资金(860443)共同资助

摘　　要：选取张掖和兰州榆中两地春季沙尘气溶胶连续观测资料,主要对2008年5月发生的一次强沙尘天气过程中气溶胶粒子浓度变化和谱分布特征进行了分析。结果表明,此次沙尘天气过程的发生与锋面过境有关;对比分析背景天气下气溶胶浓度,发现榆中站气溶胶浓度主要受人为源的影响,而张掖站主要受自然源的影响。两地沙尘过程的发生时间与物理属性不完全相同。通过对气团轨迹的分析,发现此次沙尘气溶胶有多个来源。由于受河西走廊一带地理位置和地形的影响,张掖地区沙尘天气比兰州榆中地区更为频繁和严重。Based on the aerosol data in Zhangye and Yuzhong of Lanzhou in spring,the characteristics of the sand aerosol concetration change and particle size distribution of a typical severe dust weather process happened in May have been principally analyzed.The analysis indicates that the occurrence of this sandstorm is related to the frontal passage.Comparing with the aerosol concentration in the background weather,it is found that the aerosol concentration is predominantly affected by anthropogenic source at the Yuzhong station and natural source at the Zhangye station.The occurrence time and physical properties of dust weather process are not exactly the same in these two places.The backward trajectory method shows that,many different sources existed in this dusty weather.Owing to the influences of geographical location and landform of Hexi Corridor,the dust weather occurs more frequent and serious in Zhangye than in Lanzhou.

关 键 词：张掖和兰州榆中地区 沙尘过程 质量浓度 数浓度 粒径分布 气团轨迹 锋面 

分 类 号：P445.4[天文地球—大气科学及气象学]