Chemistry Across Multiple Phases (CAMP) version 1.0: an integrated multiphase chemistry model

Abstract. A flexible treatment for gas- and aerosol-phase chemical processes has been developed models of diverse scale, from box up to global models. At the core this novel framework is an “abstracted aerosol representation” that allows a given mechanism be solved in atmospheric with different representations (e.g., sectional, modal, or particle-resolved). This accomplished by treating aerosols as collection condensed phases are implemented according representation host model. The also multiple reactions, emissions, deposition, photolysis, mass transfer) simultaneously single system. flexibility model achieved (1) using object-oriented design facilitates extensibility new types ways representing systems, (2) runtime configuration JSON input files permits making changes any part without recompiling (this widely used, human-readable format entire mechanisms described much complexity necessary), (3) automated comprehensive testing ensures stability code functionality introduced. Together, these choices enable users build customized multiphase having handle preprocessors, solvers, compilers. Removing hurdles makes type modeling accessible wider community, including modelers, experimentalists, educators. compiles stand-alone library deployed particle-resolved PartMC Multiscale Online AtmospheRe CHemistry (MONARCH) weather prediction system use at regional scales. Results initial deployment MONARCH will discussed, along future extension more complex gas–aerosol systems integration GPU-based solvers.