Size matters more than chemistry for cloud-nucleating ability of aerosol particles
Size matters more than chemistry for cloud-nucleating ability of aerosol particles
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DOI：
10.1126/science.1125261
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发表时间：
2006-06-02
期刊：
影响因子：
56.9
通讯作者：
Andreae, M. O.
中科院分区：
文献类型：
--
作者：
Dusek, U.;Frank, G. P.;Andreae, M. O.
在德国的一个非城市站点测量的各种气溶胶类型的云凝结核（CCN）谱的尺寸分辨表明，CCN浓度主要由气溶胶的数量尺寸分布。观察到CCN活化与颗粒化学成分的明显变化，但起次要作用。当忽略CCN活化的化学效应的时间变化时，仅粒径分布的变化就解释了CCN浓度变化的84%至96%。了解到粒子作为云凝结核的能力主要是由气溶胶的大小而不是成分控制，这大大有助于在区域和全球模式中处理气溶胶对云物理的影响。
Size-resolved cloud condensation nuclei (CCN) spectra measured for various aerosol types at a non-urban site in Germany showed that CCN concentrations are mainly determined by the aerosol number size distribution. Distinct variations of CCN activation with particle chemical composition were observed but played a secondary role. When the temporal variation of chemical effects on CCN activation is neglected, variation in the size distribution alone explains 84 to 96% of the variation in CCN concentrations. Understanding that particles' ability to act as CCN is largely controlled by aerosol size rather than composition greatly facilitates the treatment of aerosol effects on cloud physics in regional and global models.