石家庄秋季大气气溶胶物理特征分析

The Analysis of Physical Feature of Aerosol Particles in Autumn over Shijiazhuang Area

利用１９９０年秋季在石家庄地区不同天气条件下飞机观测对流层低层（距地面４０００ｍ以下高度）大气气溶胶的观测资料，分析了气溶胶粒子数密度、质量浓度水平和垂直分布特征及其日变化。结果表明，晴空下，石家庄地区气溶胶源于本地，地面质量浓度为０．１５×１０－９—０．８５×１０－９·ｃｍ－３，高度４０００ｍ以下谱分布特征值逆温层影响气溶胶粒子的向上输送，使其在送温层上下出现不连续分布；气溶胶的日变化表现为上午数密度大于下午，但下午粒子谱变宽；城市效应影响气溶胶粒子分布，城市上空气溶胶粒子数密度比郊区高１５％－３０％。

The daily change of number density of aerosol particles and quality concentration in horizontal and vertical derection are analyzed. The earosol data observated by aircraft is used in convective baundary layer under different weather conditions during autumn in 1990 over shijiazhuang area. The results show that the aerosol particles are of local ones under clear air over shijiazhuang area. The concentration of aerosol particles is from 0. 15 ×10-9 to 0. 85 ×10-g. cm-3. The characteristic value of spectral distribution N0 is from 1. 5 ×105 to 5. 5 ×105g. cm-3,and λ value is from 13 to 15μm-1 below 4000 meters. The upward transport of aerosol particles is limited,and its distribution occurred discontinuity due to the inversion layer effected.The daily change of aerosol number density in the morning was greater than in the afternoon. The spectral distrbution of aerosol particles was affected for the city effected. The number density of aerosol particles over the city area was higher than that over the rural area.