Influence of atmospheric conditions on the role of trifluoroacetic acid in atmospheric sulfuric acid-dimethylamine nucleation
| Autor: | Ling Liu, Zhi Yang, Kaipeng Tu, Fangqun Yu, Xiuhui Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
Freon 010504 meteorology & atmospheric sciences Physics QC1-999 Nucleation Sulfuric acid 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Chemistry chemistry Chemical engineering Trifluoroacetic acid Cluster (physics) Particle Degradation (geology) Dimethylamine QD1-999 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 21, Pp 6221-6230 (2021) |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-2020-1186 |
| Popis: | Ambient measurements combined with theoretical simulations have shown evidence that the tropospheric degradation end-products of Freon alternatives, trifluoroacetic acid (TFA), one of the most important and abundant atmospheric organic substances, can enhance the process of sulfuric acid (SA) – dimethylamine (DMA) – based nucleation process in urban environments. However, TFA is widespread all over the world with different atmospheric conditions, such as temperature and nucleation precursor concentration, which are the most important factors potentially influencing the atmospheric nucleation process and thus inducing different nucleation mechanisms. Herein, using the Density Functional Theory combined with the Atmospheric Cluster Dynamics Code, the influence of temperature and nucleation precursor concentration on the role of TFA in the SA-DMA nucleation has been investigated. The results indicate that the growth trends of clusters involving TFA can increase with the decrease of temperature. The enhancement of particle formation rate by TFA and the contributions of SA-DMA-TFA cluster to the cluster formation pathways can be up to as much as 227 times and 95 %, respectively, at relatively low temperature, low SA concentration, high TFA concentration and high DMA concentration, such as in winter or at relatively high atmospheric boundary layer and in megacities far away from industrial sources of sulfur-containing pollutants. These results provide the perspective of the realistic role of TFA in different atmospheric environments, revealing the potential influence of the tropospheric degradation of Freon alternatives under a wide range of atmospheric conditions. |
| Databáze: | OpenAIRE |
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