河南春季一次气溶胶分布特征的飞机探测研究

An Aircraft Detection Study of Aerosol Distribution Characteristics in Spring in Henan Province

利用飞机微物理探测资料,对2018年3月26日河南中北部地区一次气溶胶分布特征进行综合分析,得出以下结论:郑州市区与郊区积聚模态气溶胶粒子浓度值均在近地面达到最大值,且市区近地面污染排放比郊区严重,污染粒子被大气上升运动输送到高层,两地区浓度均随高度升高而减小。市区浓度值在4500 m附近产生2个量级骤减,郊区在3200 m附近产生2个量级骤减。市区与郊区积聚模态气溶胶粒子有效直径均随高度升高而增大;市区气溶胶粒子有效直径大于郊区的,且尺度范围更广;本地近地面排放粒子有效直径主要集中在0.4μm附近。对比过饱和度值在0.2%、0.4%、0.6%、0.8%、1.0%情况下CCN粒子浓度随高度变化,发现5种情况下粒子浓度均与气溶胶垂直分布一致,说明近地面的颗粒物排放导致近地面CCN浓度值偏高。整个探测过程中积聚模态气溶胶粒子对转化凝结核贡献较多,二者数浓度相关系数R^2为0.61,CCN活化率集中在0.4~0.6。

The distribution characteristics of aerosols in central and northern Henan province on 26 March 2018 are analyzed based on aircraft microphysical detection data.The conclusions are as follows:The concentration of accumulated modal aerosol particles in urban and suburban areas of Zhengzhou reached the maximum value near the surface.Moreover,the urban areas emitted more pollutants than suburban areas.Pollution particles were transported to higher levels by the upward motion of the atmosphere and the concentration decreased with the increase of height in both urban areas and suburban areas.The concentration in urban areas dropped by two orders of magnitude near 4500 m,but in suburban areas it was near 3200 m that the concentration dropped by two orders of magnitude.The effective diameters of accumulated aerosol particles increased with height in both urban and suburban areas.The diameters of aerosol particles in urban area were larger than in suburban area,and the scale was much wider.The effective diameters of emission particles were mainly concentrated around 0.4μm near the surface of Zhengzhou.Compared with the concentrations of CCN particles that varied with height at 0.2%,0.4%,0.6%,0.8%and 1.0%super saturation values,it is found that particle concentration is consistent with aerosol vertical distribution in the five cases,which indicates that the emission of particulate matters near the ground led to the high concentration of CCN near the surface.The accumulation of modal aerosol particles contributed a lot to the transformation of CCN during the whole detection process.The correlation coefficient between the concentration and CCN is 0.61,and the activation rate of CCN is mainly concentrated in 0.4-0.6.