Constraining condensed-phase formation kinetics of secondary organic aerosol components from isoprene epoxydiols
| Autor: | Joel A. Thornton, William Vizuete, Zhenfa Zhang, Kevin S. Chu, Ying Hsuan Lin, Jason D. Surratt, Avram Gold, Theran P. Riedel |
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| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Kinetics Analytical chemistry 010501 environmental sciences behavioral disciplines and activities 01 natural sciences lcsh:QC1-999 Phase formation Aerosol lcsh:Chemistry Reaction rate chemistry.chemical_compound Reaction rate constant lcsh:QD1-999 chemistry TRACER Environmental chemistry Sulfate aerosol lcsh:Physics Isoprene 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 16, Pp 1245-1254 (2016) |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-16-1245-2016 |
| Popis: | Isomeric epoxydiols from isoprene photooxidation (IEPOX) have been shown to produce substantial amounts of secondary organic aerosol (SOA) mass and are therefore considered a major isoprene-derived SOA precursor. Heterogeneous reactions of IEPOX on atmospheric aerosols form various aerosol-phase components or "tracers" that contribute to the SOA mass burden. A limited number of the reaction rate constants for these acid-catalyzed aqueous-phase tracer formation reactions have been constrained through bulk laboratory measurements. We have designed a chemical box model with multiple experimental constraints to explicitly simulate gas- and aqueous-phase reactions during chamber experiments of SOA growth from IEPOX uptake onto acidic sulfate aerosol. The model is constrained by measurements of the IEPOX reactive uptake coefficient, IEPOX and aerosol chamber wall losses, chamber-measured aerosol mass and surface area concentrations, aerosol thermodynamic model calculations, and offline filter-based measurements of SOA tracers. By requiring the model output to match the SOA growth and offline filter measurements collected during the chamber experiments, we derive estimates of the tracer formation reaction rate constants that have not yet been measured or estimated for bulk solutions. |
| Databáze: | OpenAIRE |
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