Multiphase Chemistry of Organic Aerosols in Outdoor Atmosphere and Indoor Environments

Multiphase chemical processes of organic aerosols are of central importance in aerosol effects on outdoor and indoor air quality. Secondary organic aerosols (SOA) account for a major fraction of fine particulate matter. The phase state of secondary organic aerosols (SOA) can be liquid, amorphous semi-solid, or glassy solid, which is important to consider as it influences various multiphase processes including SOA partitioning, size distribution dynamics, heterogeneous chemistry as well as cloud condensation and ice nucleation.

We have developed parameterizations and machine-learning-based model to predict glass transition temperature (Tg) of an organic compound. We applied this method to aerosol process models and also to a large-scale model to predict SOA phase state. Multiphase chemical processes are also highly important in indoor environments, affecting indoor air composition.

Our modeling consortium (MOCCIE) simulates ozonolysis of human skin lipids to quantify the impacts of surface processes on indoor oxidants and semi-volatile organic compounds.

Hosted by: Beth Nelson (beth.nelson@york.ac.uk) and Lucy Carpenter (lucy.carpenter@york.ac.uk).