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The Ion and Charged Aerosol Growth Enhancement (ION‐CAGE) code: A numerical model for the growth of charged and neutral aerosols
Earth and Space Science ( IF 2.312 ) Pub Date : 2020-07-31 , DOI: 10.1029/2020ea001142
J. Svensmark; N. J. Shaviv; M. B. Enghoff; H. Svensmark

The presence of small ions influences the growth dynamics of a size distribution of aerosols. Specifically the often neglected mass of small ions influences the aerosol growth rate, which may be important for terrestrial cloud formation. To this end, we develop a numerical model to calculate the growth of a species of aerosols in the presence of charge, which explicitly includes terms for ion‐condensation. It is shown that a positive contribution to aerosol growth rate is obtained by increasing the ion‐pair concentration through this ion‐condensation effect, consistent with recent experimental findings. The ion‐condensation effect is then compared to aerosol growth from charged aerosol coagulation, which is seen to be independent of ion‐pair concentration. Growth rate enhancements by ion condensation are largest for aerosol sizes less that ~25 nm, and increases proportional to the ion‐concentration. The effect of ion‐condensation is expected to be most important over pristine marine areas. The model source code is made available through a public repository.
更新日期:2020-08-01

 

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