The Role of Binary and Ion Nucleation of Sulfuric Acid and Water Vapor in the Dynamics of Sulfate Aerosol Formation in the Atmosphere
2021
The results of one-dimensional calculations of
the height profiles of nucleated sulfate aerosol particles for the
northern mid-latitudes and tropics in winter are presented. Numerical
calculations were performed using a three-dimensional model of the
transport and transformation of multicomponent gas and aerosol
substances in the atmosphere, incorporating photochemistry, nucleation
involving neutral molecules and ions, as well as
condensation/evaporation and coagulation. It is found that the resulting
dynamics of the formation of aerosol particle nuclei is not a simple sum
of ion and binary (water vapor/sulfuric acid) nucleation rates. This
dynamics is determined by the ratio of critical radii of nucleated
particles due to binary and ion nucleation of these substances
(rcr_bin and
rcr_ion) depending on temperature, relative
humidity, and ionization rate. This should be taken into account in
modeling the gas and aerosol composition of the atmosphere and comparing
calculated and observed data.
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