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Investigation of the alpha-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR

Rolletter, M. (author)
Kaminski, M. (author)
Acir, I. H. (author)
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Bohn, B. (author)
Dorn, H. P. (author)
Li, X. (author)
Lutz, Anna, 1986 (author)
Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
Nehr, S. (author)
Rohrer, F. (author)
Tillmann, R. (author)
Wegener, R. (author)
Hofzumahaus, A. (author)
Kiendler-Scharr, A. (author)
Wahner, A. (author)
Fuchs, H. (author)
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 (creator_code:org_t)
2019-09-17
2019
English.
In: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 19:18, s. 11635-11649
Related links:
https://acp.copernic...
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https://gup.ub.gu.se...
https://doi.org/10.5...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The photooxidation of the most abundant monoterpene, alpha-pinene, by the hydroxyl radical (OH) was investigated at atmospheric concentrations in the atmospheric simulation chamber SAPHIR. Concentrations of nitric oxide (NO) were below 120 pptv. Yields of organic oxidation products are determined from measured time series giving values of 0.11 +/- 0.05, 0.19 +/- 0.06, and 0.05 +/- 0.03 for formaldehyde, acetone, and pinonaldehyde, respectively. The pinonaldehyde yield is at the low side of yields measured in previous laboratory studies, ranging from 0.06 to 0.87. These studies were mostly performed at reactant concentrations much higher than observed in the atmosphere. Time series of measured radical and trace-gas concentrations are compared to results from model calculations applying the Master Chemical Mechanism (MCM) 3.3.1. The model predicts pinonaldehyde mixing ratios that are at least a factor of 4 higher than measured values. At the same time, modeled hydroxyl and hydroperoxy (HO2) radical concentrations are approximately 25 % lower than measured values. Vereecken et al. (2007) suggested a shift of the initial organic peroxy radical (RO2) distribution towards RO2 species that do not yield pinonaldehyde but produce other organic products. Implementing these modifications reduces the model-measurement gap of pinonaldehyde by 20 % and also improves the agreement in modeled and measured radical concentrations by 10 %. However, the chemical oxidation mechanism needs further adjustment to explain observed radical and pinonaldehyde concentrations. This could be achieved by adjusting the initial RO2 distribution, but could also be done by implementing alternative reaction channels of RO2 species that currently lead to the formation of pinonaldehyde in the model.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

Keyword

laser-induced fluorescence
volatile organic-compounds
gas-phase
reactions
absorption cross-sections
beta-pinene
2-methyl-3-butene-2-ol mbo
tropospheric degradation
photolysis
frequencies
initiated oxidation
radicals
Environmental Sciences & Ecology
Meteorology & Atmospheric Sciences

Publication and Content Type

ref (subject category)
art (subject category)

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