Modification of Particle Viscosity and Morphology of Secondary Organic Aerosols with the Uptake of Isoprene Epoxydiols (IEPOX)
Abstract
Secondary organic aerosol (SOA), accounting for a large portion of atmospheric fine particulate matter, are formed by the oxidation of volatile organic compounds (VOCs) and are typically co-present (mixed) with inorganic aerosol constituents. Resolving the chemical complexity, morphology, and viscosity of atmospheric SOA is crucial for understanding its formation and aging processes as well as its impact on climate. Viscosity can be defined in terms of the spreading ratio of impacted particles. The chemical composition of particles and relative humidity (RH) both affect viscosity and need to be accounted for when determining and predicting aerosol particle spreading ratios. However, viscosity of atmospheric particles is currently poorly quantified, and understanding the relationship between spreading ratios of size-selected aerosol particles and viscosity is still incomplete. Morphology also plays an important role in understanding atmospheric aerosols since it affects mixing state, heterogeneous chemical reactions, and optical properties, but is hard to quantify in SOA models due to complex chemical compositions and diverse ambient conditions.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMA218.0007L
- Keywords:
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- 0317 Chemical kinetic and photochemical properties;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0340 Middle atmosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0394 Instruments and techniques;
- ATMOSPHERIC COMPOSITION AND STRUCTURE