黄山山底大气气溶胶数浓度日变化

利用美国MSP公司生产的宽范围粒径谱仪(WPS)于2011年5月至9月在黄山山底(寨西)采集的气溶胶观测数据,分析了黄山山底大气气溶胶数浓度的日变化特征.结果表明晴天气溶胶数浓度日变化特征明显,气溶胶粒子总数浓度在6:00,12:00和18:00达到峰值.人为活动,湍流混合及山谷风是影响黄山山底气溶胶日变化的主要因素.剔除交通污染时段后,气溶胶粒子数平均浓度减少319个/cm3,即减少12.17%.其中,0.01~0.02μm,0.02~0.05μm,0.05~0.1μm,0.1~0.5μm,0.5~1.0μm,1.0~2.5μm粒径段气溶胶粒子数浓度分别降低了31.32%,20.29%,6.59%,7.49%,1.23%,2.51%.机动车尾气排放对0.01~0.05μm粒径段气溶胶的影响最明显,其气溶胶浓度降低百分比为25.81%.

Daily variation of atmospheric aerosol number concentrations at the foot of Mount Huangshan

The number concentrations for atmospheric aerosol and its daily variation were discussed by the data collected with a Wide-Range Particle Spectrometer (WPS) (manufactured by MSP. Ltc.) at the foot of Mount Huangshan (Zhaixi) from May to September, 2011. Obvious diurnal variation for atmospheric aerosol number concentrations was found in sunny days. The total aerosol number concentrations exhibited peak values at 6:00, 12:00 and 18:00. Human activities, turbulence and the mountain-valley wind were the main reasons for the daily variation. Excepted for the pollution periods mainly raised by traffic emission, the average total aerosol number concentrations decreased by 319 per cubic centimeter, and the decreased percentage for the daily average aerosol number concentrations was 12.17%. For particles within the size ranges of 0.01~0.02 μm,0.02~0.05 μm,0.05~0.1 μm,0.1~0.5 μm,0.5~1.0 μm,1.0~2.5 μm, their number concentrations decreased by 31.32%, 20.29%, 6.59%, 7.49%, 1.23%, 2.51%, respectively. It indicated that traffic emission mainly influenced the concentrations of particles in the size of 0.01~0.5 μm,which occupied 25.81%.