气溶胶消光和颗粒物粒径分布之间关系的分析

摘要

利用粒径谱仪和光声气溶胶消光仪(PAX)对正常天气、沙尘过境和秸秆焚烧等三种大气状态下颗粒物进行监测，结果表明，引起气溶胶消光系数下降的主要是细颗粒物PM2.5沙尘天气时虽然颗粒物质量浓度大幅飙升，其颗粒物数浓度并未同时大幅上升，而秸秆焚烧时，不仅颗粒物质量浓度升高，颗粒物数浓度也达到优良天气时的两倍，粒径较小的积聚模态粒子是影响气溶胶光学性质的首要因素，也是秸秆焚烧导致能见度下降的主要原因。%Particle size spectrometer and PAX for continuous monitoring of particulate matter in the three state of the atmosphere (normal weather, sand-dust weather and open burning), The results show that, The results show that, the primary cause of aerosol extinction coefficient declining is PM2.5.In the sand-dust weather, the concentration of particulate matter increased significantly,but the particle number concentration did not increase. In the open burning condition, the concentration of particulate matter and particle number concentration increased all at once. Fine particulate matter is the primary cause of visibility declining.