【作者】 张仁健； 王明星； 张文； 王秀玲；

【Author】 ZHANG Ren-jian, WANG Ming-xing, ZHANG Wen, WANGXiu-ling (LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China)

【机构】 中国科学院大气物理所大气边界层和大气化学国家重点实验室；

【摘要】 对2000年4月6日发生在北京的沙尘暴进行了分级采样,采用质子激发X荧光分析方法分析得到了20种元素的浓度。结果表明,沙尘暴期间颗粒物总浓度高达3906.2μg/m~3,是1999年同期的30倍以上,沙尘暴期间粒径小于8μm和粒径小于2μm的粒子质量浓度高达861.4和275.8μg/m~3,占总浓度的22.1%和7.1%,即使沙尘暴过后,元素总浓度依然高达937.8μg/m~3,是1999年春季的7倍多,其中粒径小于8μm和小于2μm的粒子质量浓度分别为479.7和115.6μg/m~3,占总浓度的51.2%和12.3%。由此可见,北京春季沙尘污染极其严重。本次沙尘暴期间的粒子可能主要来自北京附近的沙漠。更多还原

【Abstract】 In spring 2000 and 2001, sand-dust weathers occurred frequently over Beijing. Analysis on the chemical composition of particles of dust storm occurring on 6th April, 2000 over Beijing showed that the pollution caused by dust storm was very serious. In dust storm period, the concentration of total suspended particles reached 3906.2 μg/m3, which is the highest concentration ever reported, and is 30 times as that in last spring. Mass concentration of particles less than 8 μm aerodynamic diameter (PM8) and less than 2 urn aerodynamic diameter (PM2) reached 861.4 and 275.8 μg/m3 in the dust period, which account for 22.1% and 7.1% of the total concentrations respectively. Even after the dust storm, the total concentration still reached 937.8 μg/m3 and was 7 times as that in last spring. Mass concentration of PM8 (d<8 μm) and PM2 (d<2 μm) reached 479.7 and 115.6 ng/m3 after the dust storm stopped, which account for 51.2% and 12.3% of the total concentrations respectively. It showed that the giant particles in the dust storm period were probably from a desert near Beijing.更多还原