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Modeling Indoor Inorganic Aerosol Concentrations during the ATHLETIC Campaign with ISORROPIA
Bryan Berman, Bryan Cummings, Hongyu Guo, Pedro Campuzano-Jost, Jose-Luis Jimenez, Demetrios Pagonis, Peter F. DeCarlo, SHANNON CAPPS, Michael Waring, Douglas Day, Zachary Finewax, Benjamin A. Nault, Anne Handschy, Drexel University
Abstract Number: 396
Working Group: Indoor Aerosols
Abstract
Aerosol constituents alter as they are transported through ventilation systems into rooms indoors. For instance, changes in temperature and relative humidity (RH) between indoors and outdoors influence the partitioning of specific aerosol components. Previously, IMAGES (Indoor Model of Aerosols, Gases, Emissions, and Surfaces), a modeling platform that simulates indoor organic aerosol, was extended to incorporate the inorganic aerosol thermodynamic equilibrium model, called ISORROPIA. ISORROPIA estimates partitioning for inorganic aerosols and precursor gases; here, it is applied to outdoor and indoor concentrations of sulfate, nitrate, ammonium, nitric acid, and ammonia. The model was initially evaluated by comparing simulated aerosol to indoor measurements done by Avery et al. (2019) in a classroom during the summer and winter. However, this dataset did not have outdoor or indoor gas-phase concentrations with which to inform and evaluate IMAGES with ISORROPIA. In 2018, the ATHLETIC campaign conducted at the University of Colorado Dal Ward Athletic Center explored how human exercise, chlorine-based cleaners, and other parameters influence indoor air quality (Claflin et al., 2020; Finewax et al., 2020). Using a suite of instruments, they measured inorganic aerosol and gas concentrations in addition to temperature and RH. Herein, modeled inorganic aerosol and gas concentrations were compared to indoor measurements from the ATHLETIC campaign to further evaluate the IMAGES with ISORROPIA model with a complete datasets.