Chemistry module for the Earth system model

Abstract The description of the new version of the INM–RSHU chemistry–climate model, created on the basis of the climate model INMCM6.0 is presented. A special feature of the new version of the chemistry–climate model is the complete unification of the model structure with the basic core of the INMCM6.0 climate model. The transport of chemically active species in the atmosphere is performed on the same grid and by the same methods as the transport of meteorological parameters and aerosol. Chemical transformations are added as local processes at each grid point of the model, correcting the changes in tropospheric and stratospheric concentrations of chemically active species caused by dynamical processes. The model was tested using the results of calculations of changes in the chemical composition of the atmosphere over the last 20 years of the 20th century, performed with a version of the model with a resolution of 4 × 5 degrees in latitude and longitude.