Articles | Volume 19, issue 10
https://doi.org/10.5194/gmd-19-4601-2026
https://doi.org/10.5194/gmd-19-4601-2026
Model description paper
 | 
28 May 2026
Model description paper |  | 28 May 2026

S2AS v1.0 and 2D polarity–volatility lumping framework v1.0: automated compound classification and scalable lumping for organic aerosol modelling

Dalrin Ampritta Amaladhasan, Dan Hassan-Barthaux, and Andreas Zuend

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Short summary
A 2-dimensional polarity–volatility framework is introduced. It enables the automated characterization of thousands of organics and their systematic lumping into adjustable sets of surrogate components. A new polarity metric based on an activity coefficient ratio is presented for use in this framework. A related molecule substructure parsing tool for input file generation is introduced. This framework enables reduced-complexity representations of near-explicit organic aerosol systems.
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