银川市2次强沙尘天气气溶胶浓度及传输特征  

Analysis of Aerosol Concentrations and Transportation Characteristics in Two Strong Sand-dust Weather in Yinchuan

作　　者：刘玉兰 马筛艳[2] 辛尧胜 丁永红 裴晓蓉[4] 邵建[4] LIU Yulan MA Shaiyan XIN Yaosheng DING Yonghong PEI Xiaorong SHAO Jian(Yinchuan Meteorological Bureau, Yinchuan 750002, China Ningxia Meteorological Service Center, Yinchuan 750002, China Ningxia Observatory, Yinchuan 750002, China Ningxia Meteorological Administration, Yinchuan 750002, China)

机构地区：[1]银川市气象局,宁夏银川750002 [2]宁夏气象服务中心,宁夏银川750002 [3]宁夏气象台,宁夏银川750002 [4]宁夏气象局,宁夏银川750002

出　　处：《环境科学与技术》2017年第2期65-69,75,共6页Environmental Science & Technology

基　　金：宁夏自然基金项目资助:基于新国标的银川空气质量预报检验及订正技术研究(NZ15207)

摘　　要：通过分析银川市2次强沙尘天气过程发展、气溶胶质量浓度变化以及后向轨迹特征,研究沙尘来源和清除效率。结果表明:气溶胶粒径越大、浓度变幅越大;污染物的清除过程中,粒径越大,清除效率越高。冷空气路径不同,风向不同,沙源也不同,有外源输入的沙尘天气过程,即使风速不是很大,也可造成比较强烈的气溶胶浓度的增加;而当地起沙,气溶胶浓度的增加和风速的增大有更好的对应关系。沙尘天气能造成严重的颗粒物空气污染,但合适的风速又有利于气溶胶粒子的扩散,可以起到清除作用。By analyzing the development of two strong sand-dust weather in Yinchuan,as well as the variation character of aerosol mass concentration and backward trajectory,the dust source and the clearance efficiency were studied,and results showed that the bigger the aerosol particle size is,the faster the concentration rangeability is,and in the process of clearance,the bigger the aerosol particle size is,the higher the cleaning efficiency is. The path of cold air,the wind direction and the source of sand-dust is all different,the sand-dust weather process of exogenous inputs may cause strong increase of aerosol concentration even the wind speed is slower;but the increase of aerosol concentration and the increase of wind speed have a better corresponding relation in the local sand-dust. Sand-dust weather can cause serious particulate air pollution,but the appropriate wind speed conducive to the diffusion of aerosol particles,can play a role in scavenging.

关 键 词：宁夏 沙尘 气溶胶 传输特征 

分 类 号：X16[环境科学与工程—环境科学]