摘要
分析了2004年春季发生在北京的一次沙尘天气的物理化学特性.这次沙尘天气强度较小,沙尘过程矿物元素的粗细粒态比重接近,但粗粒态在沙尘初期的比重大于沙尘后期,也大于沙尘过后.各类污染物元素的粗细粒态比重差别较大.各类元素的直径大于16μm的粒子所占的比重均很小.大气气溶胶的粒子谱不同于以往研究的其他沙尘暴过程.这次矿物元素的粗细粒态富集因子差别较小,但污染物元素的差别较大,而且污染物元素在沙尘期间和沙尘后有着显著的变化.这次沙尘天气来源于蒙古的西南部和内蒙的中西部.
The physical and chemical characteristics of a dust storm episode occurred in Beijing in the spring of 2004 has been studied.This is a small dust event and its concentration is not very high.Concentrations of crustal elements in the fine particles are close to those in coarse particles.The percentage of coarse particles in the beginning of dust period is higher than those in late dust period and after the dust period.For the pollution elements,the percentages of the fine and coarse particles change according to the specific element and time.The percentage of the particles with diameter more than 16 μm is very small.The enrichment factors of the crustal elements have little change in and after the dust storm period.But the pollution elements such as Cu,As,S and Br have significant changes during the dust period and after dust period.The sources of this dust event came from the southwestern Mongolia and western part of Inner Mongolia.
出处
《过程工程学报》
CAS
CSCD
北大核心
2006年第z2期81-85,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:40675074)
863计划资助项目(编号:2005AA641010
973计划资助项目(编号:2007CB407300)
关键词
沙尘暴
化学成份
质量浓度
富集因子
后向轨迹分析
dust storm
chemical composition
concentration
enrichment factor
backward trajectory
