合肥地区气溶胶数浓度和谱分布特征的观测研究

Observational study on the concentration and size distribution of atmospheric aerosol over the Hefei area

利用 APS-3321型空气动力学粒度仪对合肥地区的大气气溶胶进行观测,比较和分析了气溶胶数浓度和谱分布的变化特征。结果表明:气溶胶数浓度的日变化和日际变化显著,并且与天气条件密切相关。其平均数浓度谱为单峰谱,峰值中心在聚集模态,平均表面积谱和平均质量谱为双峰谱,峰值中心分别在聚集模态和粗模态,且其最大峰值都在聚集模态。根据其谱分布特征,应用正态对数函数进行了拟合,得到了其数学函数表达式,该结果可用于分析气溶胶对大气激光传输的影响。

By using the Aerodynamic Particle Sizer (APS-3321),the number concentration and size distribution of atmospheric aerosols in Hefei were measured and analyzed.Results show that the diurnal variation of aerosol's number concentration has a good relationship with weather.The average size-number distribution is single-peaked and its peak value locates at the accumulation mode.Both the average size-surface and the size-mass distributions are double-peaked.Moreover,their peak values locate at accumulation mode and coarse mode respectively.Finally,the measured size distributions of aerosol particles are fitted very well by log-normal functions.These results are useful for analyzing the effect of aerosol particles on laser propagation in atmosphere.