摘要
采用分形理论研究了北京市可吸入颗粒物（PM10）粒度分布的分形特征．采集了北京市不同功能区大气PM10样品，计算了各采样点PM10粒度分布的分形维数，分析了PM10粒度分布分形维数的变化与粒度分布的关系，讨论了采样时气象条件等因素对颗粒物粒度分布分形维数的影响．结果表明，北京市PM10粒度分布的分形维数在1．6446～2．6655之间，夏季PM10的粒度分布分形维数（2．6655）明显大于秋季（1．6446），表明夏季PM10的粒度普遍较秋季的细．分形维数能够较好地表征颗粒物的粒度分布，可以用分形维数定量比较不同采样点、不同季节的粒度分布，颗粒物的不同粒度分布分形维数和采样时的局部环境及气象条件相吻合．
Fractal theory was applied to study the size distribution of airborne inhalable particulates （PM10） in Beijing. PM10 samples were collected at different functional domains in Beijing and the fractal dimensions of size distribution （FDSD） values of PM10 were calculated. The relationships between variations of FDSD and size distribution of PM10 were further investigated and the effects of meteorological conditions during sampling on the FDSD of PM10 were discussed. The results indicate that the FDSD of PM10in Beijing vary from 1. 6446 to 2.6655, and the FDSD of PM10 in summer are higher than that in autumn, which shows that the size of par- ticles in summer is more fine than that in autumn. The size distribution of PM10 can be characterized by fractal dimensions. The size distribution of PM10 at different sampling sites and in different seasons can be compared quantitatively by FDSD. The FDSD of PM10 coincide with the local environments and meteorological conditions.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2008年第3期407-411,共5页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2006CB403701)
国家自然科学基金项目(40575065)
