Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-134
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
14 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Evaluation of OH and HO2 concentrations and their budgets during photo-oxidation of 2-methyl-3-butene-2-ol (MBO) in the atmospheric simulation chamber SAPHIR
Anna Novelli1, Martin Kaminsky1,a, Michael Rolletter1, Ismail-Hakki Acir1,b, Birger Bohn1, Hans-Peter Dorn1, Xin Li1,c, Anna Lutz2, Sascha Nehr1,d, Franz Rohrer1, Ralf Tillmann1, Robert Wegener1, Frank Holland1, Andreas Hofzumahaus1, Astrid Kiendler-Scharr1, Andreas Wahner1, and Hendrik Fuchs1 1Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
2Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
anow at: Bundesamt für Verbraucherschutz, Abteilung 5 – Methodenstandardisierung, Referenzlaboratorien und Antibiotikaresistenz, Berlin, Germany
bnow at: Institute of Nutrition and Food Sciences, Food Chemistry, University of Bonn, Bonn, Germany
cnow at: State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
dnow at: INBUREX Consulting GmbH, Process Safety, Hamm, Germany
Abstract. Several field studies reported unexpected large concentrations of hydroxyl and hydroperoxyl radicals (OH and HO2, respectively) in forested environments that could not be explained by the traditional oxidation mechanisms which largely underestimated the observations. These environments were characterized by large concentrations of biogenic volatile organic compounds (BVOC) and low nitrogen oxide concentration. In isoprene-dominated environments, models developed to simulate atmospheric photochemistry generally underestimated the observed OH radical concentrations. In contrast, HO2 radical concentration showed large discrepancies with model simulations mainly in non-isoprene dominated forested environments. An abundant BVOC emitted by lodgepole and ponderosa pines is 2-methyl-3-butene-2-ol (MBO), observed in large concentrations for studies where the HO2 concentration was poorly described by model simulations. In this work, the photooxidation of MBO by OH was investigated for NO concentrations lower than 200 pptv in the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich. Measurements of OH and HO2 radicals, OH reactivity (kOH), MBO, OH precursors and organic products (acetone and formaldehyde) were used to test our current understanding of the OH-oxidation mechanisms for MBO by comparing measurements with model calculations. All the measured trace gases agree well with the model results (within 15 %) indicating a well understood mechanism for the MBO oxidation by OH. Therefore, the oxidation of MBO cannot contribute to reconcile the unexplained high OH and HO2 radical concentrations found in previous field studies.
Citation: Novelli, A., Kaminsky, M., Rolletter, M., Acir, I.-H., Bohn, B., Dorn, H.-P., Li, X., Lutz, A., Nehr, S., Rohrer, F., Tillmann, R., Wegener, R., Holland, F., Hofzumahaus, A., Kiendler-Scharr, A., Wahner, A., and Fuchs, H.: Evaluation of OH and HO2 concentrations and their budgets during photo-oxidation of 2-methyl-3-butene-2-ol (MBO) in the atmospheric simulation chamber SAPHIR, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-134, in review, 2018.
Anna Novelli et al.
Anna Novelli et al.
Anna Novelli et al.

Viewed

Total article views: 341 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
250 80 11 341 8 11

Views and downloads (calculated since 14 Mar 2018)

Cumulative views and downloads (calculated since 14 Mar 2018)

Viewed (geographical distribution)

Total article views: 341 (including HTML, PDF, and XML)

Thereof 340 with geography defined and 1 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 23 Jun 2018
Publications Copernicus
Download
Short summary
The impact of the photo-oxidatio of the 2-methyl-3-butene-2-ol (MBO) on the concentration of radicals speces was studied in the atmorpsheric simulation chamber SAPHIR. MBO is avolatile organic compound mainly emitted by ponderosa and lodgepole pines which are very abundant in forest in central-west USA. Very good agreement between measured and modelled radicals concentrations and products from the oxidation of MBO was observed in an environment with NO ~ 200 pptv.
The impact of the photo-oxidatio of the 2-methyl-3-butene-2-ol (MBO) on the concentration of...
Share