Journal of Atmospheric and Environmental Optics ›› 2022, Vol. 17 ›› Issue (2): 213-219.

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Atmospheric physicochemical properties of 2-methylglyceric acid-sulfuric acid/methanesulfonic acid clusters

ZHAO Feng1;2, FENG Yajuan2∗   

  1. 1 Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; 2 School of Information Science and Technology, University of Science and Technology of China, Hefei 230026, China
  • Received:2019-05-31 Revised:2022-01-18 Online:2022-03-28 Published:2022-03-28

Abstract: Atmospheric aerosols can affect the climate system of the earth by scattering or absorbing long-wave and short-wave radiation. As one of the aerosol tracers, 2-Methylglyceric acid has been observed frequently in atmospheric observations and nucleation experiments. Sulfuric acid and methanesulfonic acid, as very important aerosol precursors, have also received extensive attention and been widely studied. Therefore, 2-methylglyceric acid-sulfuric acid/methanesulfonic acid clusters were simulated based on the theory level of DF-MP2-F12/VDZ-F12 combined with M06-2X/6-311G(3df,3pd), and their physicochemical properties in the atmosphere were analyzed. The results show that 2-methylglyceric acid-sulfuric acid cluster and 2-methylglyceric acid-methanesulfonic acid cluster have the same Gibbs free energy temperature dependence. 2-Methylglyceric acid-sulfuric acid/methanesulfonic acid clusters will preferentially evaporate 2-methylglyceric acid molecules rather than sulfuric acid/methanesulfonic acid molecules, and the evaporation rate of 2-methylglyceric acid molecules increases rapidly with the increase of the cluster size. In addition, the Rayleigh scattering intensity and polarizability of 2-methylglyceric acid-sulfuric acid/methanesulfonic acid clusters are calculated, which is helpful to understand the influence of the clusters on atmospheric radiation.

Key words: atmospheric aerosol, nucleation, Rayleigh scattering, evaporation rate

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