References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-2789-2014

Suppression of new particle formation from monoterpene oxidation by NOx

Wildt

¹ Mentel

T. F.

² Kiendler-Scharr

² Hoffmann

³ Andres

² Ehn

https://orcid.org/0000-0002-0215-4893

⁵ ² Kleist

https://orcid.org/0000-0003-2997-9323

¹ Müsgen

⁶ ² Rohrer

² Rudich

https://orcid.org/0000-0003-3149-0201

⁴ Springer

² Tillmann

https://orcid.org/0000-0003-0648-6622

² Wahner

https://orcid.org/0000-0001-8948-1928

Institut für Bio- und Geowissenschaften, IBG-2, Forschungszentrum Jülich, 52425, Jülich, Germany

Institut für Energie- und Klimaforschung, IEK-8, Forschungszentrum Jülich, 52425, Jülich, Germany

Institut für Anorganische und Analytische Chemie, Johannes Gutenberg Universität Mainz, 55128, Mainz, Germany

Weizmann Institute of Science, Rehovot, 76100, Israel

now at: Department of Physics, Division of Atmospheric Sciences, Helsinki University, PL 64, 00014 Helsingin yliopisto, Finland

now at: Frankenstrasse 8, 52382, Niederzier, Germany

18 03 2014

14 6 2789 2804

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/2789/2014/acp-14-2789-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/2789/2014/acp-14-2789-2014.pdf

The impact of nitrogen oxides (NOx = NO + NO2) on new particle formation (NPF) and on photochemical ozone production from real plant volatile organic compound (BVOC) emissions was studied in a laboratory setup. At high NOx conditions ([BVOC] / [NOx] < 7, [NOx] > 23 ppb) new particle formation was suppressed. Instead, photochemical ozone formation was observed resulting in higher hydroxyl radical (OH) and lower nitrogen monoxide (NO) concentrations. When [NO] was reduced back to levels below 1 ppb by OH reactions, NPF was observed. Adding high amounts of NOx caused NPF to be slowed by orders of magnitude compared to analogous experiments at low NOx conditions ([NOx] ~300 ppt), although OH concentrations were higher. Varying NO2 photolysis enabled showing that NO was responsible for suppression of NPF. This suggests that peroxy radicals are involved in NPF. The rates of NPF and photochemical ozone production were related by power law dependence with an exponent approaching −2. This exponent indicated that the overall peroxy radical concentration must have been similar when NPF occurred. Thus, permutation reactions of first-generation peroxy radicals cannot be the rate limiting step in NPF from monoterpene oxidation. It was concluded that permutation reactions of higher generation peroxy-radical-like intermediates limit the rate of new particle formation. In contrast to the strong effects on the particle numbers, the formation of particle mass was substantially less sensitive to NOx concentrations. If at all, yields were reduced by about an order of magnitude only at very high NOx concentrations.

European Commission

PEGASOS - Pan-European Gas-AeroSol-climate interaction Study (265148)

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