Observations of isoprene chemistry and its role in ozone production at a semirural site during the 1995 Southern Oxidants Study
| Autor: | Paul B. Shepson, S. B. Bertman, Bryan G. Splawn, K. J. Olszyna, Daniel D. Riemer, T. K. Starn, J. S. White, Rod G. Zika |
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| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Atmospheric Science Ozone Ecology Paleontology Soil Science Forestry Methacrolein Aquatic Science Total ozone Oceanography chemistry.chemical_compound Geophysics Hydrocarbon chemistry Space and Planetary Science Geochemistry and Petrology Environmental chemistry Methyl vinyl ketone Earth and Planetary Sciences (miscellaneous) Volatile organic compound Nitrogen oxide Isoprene Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 103:22425-22435 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/98jd01279 |
| Popis: | Isoprene and its oxidation products, methyl vinyl ketone (MVK) and methacrolein (MACR), were measured in a semirural environment that was occasionally heavily impacted by urban emissions. At this site, isoprene was the most important hydrocarbon in terms of kOH·[hydrocarbon], but the aldehydes HCHO and CH3CHO also appear to be very important. The local isoprene photochemistry appears to be occasionally enhanced in NOx-rich urban plumes that are adverted to the site over intermediate forested land. When O3 was being rapidly produced in urban plumes adverted to this forested site, isoprene was found to contribute ≈28% of the total ozone production. We observe that many of the peaks in isoprene oxidation products at this surface site arise from downward mixing of more photochemically processed air aloft, as the nocturnal inversion breaks up in the morning. We estimate that, in the daytime, typically 1–2% of the NOy at this NOx-rich site is composed of isoprene nitrates. |
| Databáze: | OpenAIRE |
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