Aircraft measurements of the vertical distribution and activation property of aerosol particles over the Loess Plateau in China
Aircraft measurements of the vertical distribution and activation property of aerosol particles over the Loess Plateau in China
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DOI：
10.1016/j.atmosres.2014.12.004
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发表时间：
2015-03
影响因子：
5.5
通讯作者：
Junxia Li;Yan Yin;Peiren Li;Zhanqing Li;Run-jun Li;M. Cribb;Zipeng Dong;Fang Zhang;Jin Li
中科院分区：
文献类型：
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作者：
Junxia Li;Yan Yin;Peiren Li;Zhanqing Li;Run-jun Li;M. Cribb;Zipeng Dong;Fang Zhang;Jin Li
首次对黄土高原地区大气气溶胶和云凝结核（CCN）进行了飞机综合观测。分析了2013年7月和8月6次飞行的数据。在该区域，细气溶胶占主导地位。在灰霾日，细颗粒物在总气溶胶负荷中所占的比例最大。气溶胶数浓度随海拔高度呈指数下降。逆温层造成低层气溶胶聚集区。气溶胶粒子平均粒径随海拔升高而增大，较大的粒子主要分布在2 km以上。不同高度范围的气溶胶粒子数谱分布呈现出两个或三个峰值。从0.01 μm到20 μm的气溶胶粒子数谱分布可用三种对数正态分布函数拟合。CCN数浓度（NCCN）随海拔升高而降低，与CN浓度（NCN）呈线性相关。在0.3%SS下的CCN与CN的分数（fCCN/CN）是在0.4%SS下的一半。雾霾天的fCCN/CN比晴天低。CCN/CN的垂直分布和有效直径（艾德）相似，但fCCN/CN随海拔升高而增加。
For the first time, comprehensive aircraft measurements of atmospheric aerosols and cloud condensation nuclei (CCN) were made over the Loess Plateau in Shanxi, China. Data from six flights in July and August 2013 were analyzed. Fine aerosols were predominant over the region. On the one hazy day, the fraction of fine particles in the total aerosol load was the greatest. Aerosol number concentration decreased exponentially with altitude. Inversion layers caused low-level aerosol accumulation zones. The mean aerosol particle size increased with altitude, and the larger particles were mainly found above 2 km. Aerosol number size distributions at different height ranges showed two or three peaks. The aerosol number size distribution from 0.01 μm to 20 μm can be fitted with three log-normal distribution functions. The number concentration of CCN (NCCN) decreased with altitude.NCCNwas linearly related to the CN concentration (NCN). The fraction of CCN to CN (fCCN/CN) at 0.3% SS was half of that at 0.4% SS. ThefCCN/CNon the hazy day was lower than on the clear days. Vertical profiles offCCN/CNand the effective diameter (ED) were similar, although thefCCN/CNincreased with altitude.