Towards fully ab initio simulation of atmospheric aerosol nucleation

Shuai Jiang (), Yi-Rong Liu, Teng Huang, Ya-Juan Feng, Chun-Yu Wang, Zhong-Quan Wang, Bin-Jing Ge, Quan-Sheng Liu, Wei-Ran Guang and Wei Huang
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Shuai Jiang: University of Science and Technology of China
Yi-Rong Liu: University of Science and Technology of China
Teng Huang: Chinese Academy of Sciences
Ya-Juan Feng: University of Science and Technology of China
Chun-Yu Wang: University of Science and Technology of China
Zhong-Quan Wang: Chinese Academy of Sciences
Bin-Jing Ge: University of Science and Technology of China
Quan-Sheng Liu: University of Science and Technology of China
Wei-Ran Guang: University of Science and Technology of China
Wei Huang: University of Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Atmospheric aerosol nucleation contributes to approximately half of the worldwide cloud condensation nuclei. Despite the importance of climate, detailed nucleation mechanisms are still poorly understood. Understanding aerosol nucleation dynamics is hindered by the nonreactivity of force fields (FFs) and high computational costs due to the rare event nature of aerosol nucleation. Developing reactive FFs for nucleation systems is even more challenging than developing covalently bonded materials because of the wide size range and high dimensional characteristics of noncovalent hydrogen bonding bridging clusters. Here, we propose a general workflow that is also applicable to other systems to train an accurate reactive FF based on a deep neural network (DNN) and further bridge DNN-FF-based molecular dynamics (MD) with a cluster kinetics model based on Poisson distributions of reactive events to overcome the high computational costs of direct MD. We found that previously reported acid-base formation rates tend to be significantly underestimated, especially in polluted environments, emphasizing that acid-base nucleation observed in multiple environments should be revisited.

Date: 2022
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DOI: 10.1038/s41467-022-33783-y

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