ISORROPIA was originally developed at the Division of Marine and Atmospheric Chemistry of the Rosenstiel School of Marine and Atmospheric Science, University of Miami, and ISORROPIA II at the Schools of Earth & Atmospheric Sciences and Chemical & Biomolecular Engineering at the Georgia Institute of Technology.

The objective was to develop a computationally efficienct and rigorous aerosol thermodynamics module for use in regional and global aerosol models.
The complete theory of ISORROPIA, together with a detailed description of the equations solved, the activity coefficient calculation methods and the computational algorithms used can be found in Nenes et al., 1998a,b and Fountoukis and Nenes, 2007. The performance and advantages of ISORROPIA over the usage of other thermodynamic equilibrium codes has been assessed in numerous studies (e.g., Nenes et al. 1998b; Ansari and Pandis, 1999ab; Yu et al., 2005). It has been evaluated wth numerous in-situ data sets (e.g., Yu et al., 2005; Nowak et al., 2006; Fountoukis et al., 2009)

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