Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 12, Issue 2, Pages 615-634Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-12-615-2012
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Funding
- National Science Foundation
- EPA
- Electric Power Research Institute (EPRI)
- European Research Council
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1012293] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1136479] Funding Source: National Science Foundation
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We discuss the use of a two-dimensional volatility-oxidation space (2-D-VBS) to describe organic-aerosol chemical evolution. The space is built around two coordinates, volatility and the degree of oxidation, both of which can be constrained observationally or specified for known molecules. Earlier work presented the thermodynamics of organics forming the foundation of this 2-D-VBS, allowing us to define the average composition (C, H, and O) of organics, including organic aerosol (OA) based on volatility and oxidation state. Here we discuss how we can analyze experimental data, using the 2-D-VBS to gain fundamental insight into organic-aerosol chemistry. We first present a well-understood traditional secondary organic aerosol (SOA) system - SOA from alpha-pinene + ozone, and then turn to two examples of non-traditional SOA formation - SOA from wood smoke and dilute diesel-engine emissions. Finally, we discuss the broader implications of this analysis.
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