期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 2, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL085627
关键词
nucleation; new particle formation; cluster; sulfuric acid; dimethylamine; trifluoroacetic acid
资金
- National Key R&D Program of China [2017YFC0209505]
- National Natural Science Foundation of China [21976015, 21925601, 91644213]
- Academy of Finland
- European Research Council [692891DAMOCLES]
- University of Helsinki, Faculty of Science ATMATH project
Sulfuric acid (SA)-dimethylamine (DMA)-H2O cluster formation has been proven to be responsible for a significant part of new particle formation (NPF) in a Chinese megacity. However, the possible involvement of common atmospheric acids in the subsequent growth of SA-DMA clusters remains elusive. We simulated formation and growth of clusters using atmospheric relevant concentrations of SA, DMA, and trifluoroacetic acid (TFA), a commonly observed atmospheric perfluorocarboxylic acid, using Density Functional Theory combined with Atmospheric Cluster Dynamics Code. The presence of TFA leads to complex cluster formation routes and an enhancement of NPF rates by up to 2.3 ([TFA] = 5.0 x 10(6) molecules cm(-3), [SA] = 1.0 x 10(6) molecules cm(-3), and [DMA] = 1.5 x 10(9) molecules cm(-3)). The agreement of (SA)(1)center dot(DMA)(1-2)center dot(TFA)(1) concentrations between simulations and ambient measurements during NPF events validates model predictions and implies that perfluorocarboxylic acids could potentially boost atmospheric SA-DMA NPF rates.
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