摘要
利用激光粒子计数器和颗粒物自动测定仪测量的郑州市大气气溶胶粒子的数浓度和质量浓度,分析了局地气溶胶的干沉降和湿沉降以及郑州市大气气溶胶数浓度和质量浓度的时空变化,结果表明:郑州市局地区域大气气溶胶中粒径≥2μm的粒子,沉降速度随粒径的增大而增大,而粒径≤0.3μm的粒子,沉降速度变化不大;湿沉降率大于干沉降率。气溶胶浓度有明显的日变化特征,17:00-19:00为最高峰,6:00-9:00为次高峰,这是早晨及下午上下班汽车运行高峰期向大气排放的尾气和汽车扬尘所致。在垂直分布上,45-80 m处的粒子数多于1.5 m处的粒子数;在水平分布上,交通建筑区内的浓度高于其他功能区的浓度。
Number and mass concentration of atmospheric aerosol particles were measured in Zhengzhou by the laser particle counter and the meter of automatic measurement of particulate matter.Using these measured data,dry sedimentation and wet sedimentation at local area were analyzed as well as the spatial temporal change of atmospheric aerosol concentration.For the particles with diameter ≥2 μm,its sedimentation rate increased with increasing diameter.However,there was no evident change in sedimentation rate for those particles ≤0.3 μm.Wet sedimentation rate was higher than that of dry sedimentation.There was significant characteristics in daily variations of atmospheric aerosol concentration,with the highest value occurred during the period from 17：00 to 19：00,and second value during the period from 6：00 to 9：00.And this was mainly caused by automobile exhaust and dust during the car rush time.For the vertical distribution,the number of atmospheric aerosol particle was more at 45—80 m than that at 1.5 m,and for the horizontal distribution,it was higher in the traffic and construction areas than that in other areas.
出处
《气象与环境科学》
2010年第2期7-13,共7页
Meteorological and Environmental Sciences
关键词
大气气溶胶
数浓度
质量浓度
时空变化
atmospheric aerosol
number concentration
mass concentration
spatial and temporal change
