Secondary Organic Aerosol Mass Yields from NO<sub>3</sub> Oxidation of α‑Pinene and Δ‑Carene: Effect of RO<sub>2</sub> Radical Fate
- Douglas A. Day (1482856)
- Juliane L. Fry (1340076)
- Hyun Gu Kang (3091131)
- Jordan E. Krechmer (3301047)
- Benjamin R. Ayres (1461766)
- Natalie I. Keehan (13876860)
- Samantha L. Thompson (3301041)
- Weiwei Hu (322065)
- Pedro Campuzano-Jost (1288470)
- Jason C. Schroder (4899616)
- Harald Stark (1662703)
- Marla P. DeVault (13876863)
- Paul J. Ziemann (774669)
- Kyle J. Zarzana (628296)
- Robert J. Wild (13876866)
- William P. Dubè (4491943)
- Steven S. Brown (1340094)
- Jose L. Jimenez (526440)
DOIAbstract
Dark chamber experiments were conducted to study the SOA formed from the oxidation of α-pinene and Δ-carene under different peroxy radical (RO2) fate regimes: RO2 + NO3, RO2 + RO2, and RO2 + HO2. SOA mass yields from α-pinene oxidation were <1 to ∼25% and strongly dependent on available OA mass up to ∼100 μg m–3. The strong yield dependence of α-pinene oxidation is driven by absorptive partitioning to OA and not by available surface area for condensation. Yields from Δ-carene + NO3 were consistently higher, ranging from ∼10–50% with some dependence on OA for –3. Explicit kinetic modeling including vapor wall losses was conducted to enable comparisons across VOC precursors and RO2 fate regimes and to determine atmospherically relevant yields...
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