Global Simulations of Phase State and Equilibration Time Scales of Secondary Organic Aerosols with GEOS-Chem.

ABSTRACT: The phase state of secondary organic aerosols (SOA) can range from liquid through amorphous semisolid to glassy solid, which is important to consider as it influences various multiphase processes including SOA formation and partitioning, multiphase chemistry, and cloud activation. In this study, we simulate the glass transition temperature and viscosity of SOA over the globe using the global chemical transport model, GEOS-Chem. The simulated spatial distributions show that SOA at the surface exist as liquid over equatorial regions and oceans, semisolid in the midlatitude continental regions, and glassy solid over lands with low relative humidity. The predicted SOA viscosities are mostly consistent with the available measurements. In the free troposphere, SOA particles are mostly predicted

SUBMITTER: Luu R 

PROVIDER: S-EPMC11849007 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature