【摘要】 为了探讨气溶胶污染的微观特征及可能原因,利用2008年10月19日一次飞机探测的资料,对保定和石家庄的气溶胶分布特征进行对比分析。结果发现:保定边界层内气溶胶数浓度垂直递减明显,边界层以上接近背景气溶胶。石家庄边界层附近气溶胶浓度出现累积,边界层以上数浓度迅速降低,2300 m出现峰值。逆温层和相对湿度峰值附近累积的较高浓度的气溶胶是影响气溶胶垂直分布的重要原因。气溶胶数浓度和平均直径与相对湿度并不完全呈正相关。1500 m以下气溶胶浓度与局地排放源有直接关系,人为活动及风速是影响气溶胶水平分布的重要因素。区域输送对混合层以上气溶胶浓度的影响较大。保定不同高度层的粒子谱均呈单峰分布,石家庄低层粒子谱呈双峰或三峰分布。更多还原

【Abstract】 In order to find the possible causes and micro characteristics of aerosol pollution, based on theairplane detection data on Oct 19 th, 2008, the aerosol distribution characteristics over Baoding andShijiazhuang were contrasted and analyzed. The results showed that: the aerosol number concentrationdeclined obviously under boundary layer, and approached background concentration of aerosol above boundarylayer. The aerosol number concentration was accumulated near the boundary layer over Shijiazhuang, declinedrapidly above the boundary layer, presented a peak value at the height of 2300 m. There were different verticaldistribution characteristics near the boundary layer top. The inversion layer and relative humidity had a greatimpact on the vertical distribution of aerosol. The number concentration and mean diameter did not completelyand positively correlate with relative humidity. The aerosol number concentration was directly related withregional emission sources below 1500 m, human activities and wind speed were important factors influencingthe horizontal distribution of aerosol. The aerosol number concentration above mixed layer was mainly affectedby regional transport. The aerosol particle spectrum at different height levels presented unimodal pattern overBaoding and bimodal or three-modal pattern at lower levels over Shijiazhuang.更多还原