Molecular identification of organic vapors driving atmospheric nanoparticle growth
Molecular identification of organic vapors driving atmospheric nanoparticle growth
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DOI：
10.1038/s41467-019-12473-2
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发表时间：
2019-09-30
影响因子：
16.6
通讯作者：
Yli-Juuti, Taina
中科院分区：
文献类型：
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作者：
Mohr, Claudia;Thornton, Joel A.;Yli-Juuti, Taina
大气中通过成核形成的颗粒提供了大气云凝结核数量的大约一半，但在许多地方，这一过程受到新形成颗粒生长的限制。这种生长通常是通过有机蒸气的冷凝来实现的。因此，识别这些蒸气及其来源对于模拟气溶胶-云相互作用的变化至关重要，而气溶胶-云相互作用是人为气候强迫中最不确定的方面之一。在这里，我们提出了对森林环境中有机蒸气分布的直接分子水平观察，这可以解释同时观察到的 3 至 50 nm 大气纳米颗粒的生长。此外，这些蒸气的挥发性分布足以解释纳米颗粒的生长，而无需调用颗粒相过程。因此，观测到的质量增长与根据森林环境中冷凝蒸气的观测质量预测的增长之间的一致性代表了大气颗粒增长表征方面的重要一步。
Particles formed in the atmosphere via nucleation provide about half the number of atmospheric cloud condensation nuclei, but in many locations, this process is limited by the growth of the newly formed particles. That growth is often via condensation of organic vapors. Identification of these vapors and their sources is thus fundamental for simulating changes to aerosol-cloud interactions, which are one of the most uncertain aspects of anthropogenic climate forcing. Here we present direct molecular-level observations of a distribution of organic vapors in a forested environment that can explain simultaneously observed atmospheric nanoparticle growth from 3 to 50 nm. Furthermore, the volatility distribution of these vapors is sufficient to explain nanoparticle growth without invoking particle-phase processes. The agreement between observed mass growth, and the growth predicted from the observed mass of condensing vapors in a forested environment thus represents an important step forward in the characterization of atmospheric particle growth.