Significant contributions of trimethylamine to sulfuric acid nucleation in polluted environments
Significant contributions of trimethylamine to sulfuric acid nucleation in polluted environments
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DOI：
10.1038/s41612-023-00405-3
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发表时间：
2023-06
影响因子：
9
通讯作者：
Runlong Cai;Rujing Yin;Xuelian Li;H. Xie;Dongsen Yang;V. Kerminen;J. Smith;Yan Ma;J. Hao
中科院分区：
文献类型：
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作者：
Runlong Cai;Rujing Yin;Xuelian Li;H. Xie;Dongsen Yang;V. Kerminen;J. Smith;Yan Ma;J. Hao
作为一个最不了解的气溶胶过程，成核可以是大气气溶胶的主要来源。硫酸（SA）-二甲胺（DMA）二元成核作用已被认为是污染大陆边界层的一种控制机制。在这里，我们证明了在复杂的气氛中的成核的重要性，并提出了一个分子水平的SA-DMA-TMA三元成核机制作为传统的二元机制的改进。利用提出的机理，我们可以连接到气态胺的SA-胺团簇信号在北京城市大气中测量。结果表明，TMA能使北京地区SA-DMA基新粒子的形成加速50- 100%。考虑到全球丰富的TMA和DMA，我们的研究结果意味着相当的重要性，TMA和DMA的成核在污染的大陆边界层，可能更高的贡献，从TMA在污染的农村环境和未来的城市环境与控制DMA排放。
As one of the least understood aerosol processes, nucleation can be a dominant source of atmospheric aerosols. Sulfuric acid (SA)-amine binary nucleation with dimethylamine (DMA) has been recognized as a governing mechanism in the polluted continental boundary layer. Here we demonstrate the importance of trimethylamine (TMA) for nucleation in the complex atmosphere and propose a molecular-level SA-DMA-TMA ternary nucleation mechanism as an improvement upon the conventional binary mechanism. Using the proposed mechanism, we could connect the gaseous amines to the SA-amine cluster signals measured in the atmosphere of urban Beijing. Results show that TMA can accelerate the SA-DMA-based new particle formation in Beijing by 50–100%. Considering the global abundance of TMA and DMA, our findings imply comparable importance of TMA and DMA to nucleation in the polluted continental boundary layer, with probably higher contributions from TMA in polluted rural environments and future urban environments with controlled DMA emissions.