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Volume 16, issue 17
Atmos. Chem. Phys., 16, 11237-11248, 2016
https://doi.org/10.5194/acp-16-11237-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 11237-11248, 2016
https://doi.org/10.5194/acp-16-11237-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Sep 2016

Research article | 12 Sep 2016

Impact of NOx and OH on secondary organic aerosol formation from β-pinene photooxidation

Mehrnaz Sarrafzadeh1,3, Jürgen Wildt2,1, Iida Pullinen1, Monika Springer1, Einhard Kleist2, Ralf Tillmann1, Sebastian H. Schmitt1, Cheng Wu1, Thomas F. Mentel1, Defeng Zhao1, Donald R. Hastie3, and Astrid Kiendler-Scharr1 Mehrnaz Sarrafzadeh et al.
  • 1Institute for Energy and Climate Research, IEK-8, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 2Institute of Bio- and Geosciences, IBG-2, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 3Centre for Atmospheric Chemistry, York University, 4700 Keele St., Toronto, ON M3J 1P3, Canada

Abstract. In this study, the NOx dependence of secondary organic aerosol (SOA) formation from photooxidation of the biogenic volatile organic compound (BVOC) β-pinene was comprehensively investigated in the Jülich Plant Atmosphere Chamber. Consistent with the results of previous NOx studies we found increases of SOA yields with increasing [NOx] at low-NOx conditions ([NOx]0  <  30 ppb, [BVOC]0 ∕ [NOx]0  >  10 ppbC ppb−1). Furthermore, increasing [NOx] at high-NOx conditions ([NOx]0  >  30 ppb, [BVOC]0 ∕ [NOx]0  ∼  10 to  ∼  2.6 ppbC ppb−1) suppressed the SOA yield. The increase of SOA yield at low-NOx conditions was attributed to an increase of OH concentration, most probably by OH recycling in NO + HO2  →  NO2 + OH reaction. Separate measurements without NOx addition but with different OH primary production rates confirmed the OH dependence of SOA yields. After removing the effect of OH concentration on SOA mass growth by keeping the OH concentration constant, SOA yields only decreased with increasing [NOx]. Measuring the NOx dependence of SOA yields at lower [NO] ∕ [NO2] ratio showed less pronounced increase in both OH concentration and SOA yield. This result was consistent with our assumption of OH recycling by NO and to SOA yields being dependent on OH concentrations. Our results furthermore indicated that NOx dependencies vary for different NOx compositions. A substantial fraction of the NOx-induced decrease of SOA yields at high-NOx conditions was caused by NOx-induced suppression of new particle formation (NPF), which subsequently limits the particle surface where low volatiles condense. This was shown by probing the NOx dependence of SOA formation in the presence of seed particles. After eliminating the effect of NOx-induced suppression of NPF and NOx-induced changes of OH concentrations, the remaining effect of NOx on the SOA yield from β-pinene photooxidation was moderate. Compared to β-pinene, the SOA formation from α-pinene photooxidation was only suppressed by increasing NOx. However, basic mechanisms of the NOx impacts were the same as that of β-pinene.

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Short summary
We investigated NOx impacts on the formation of secondary organic aerosol (SOA) mass from b-pinene and we could reveal two different mechanisms of impacts. One of them was the impact of NOx on OH that could explain increasing SOA yield with increasing NOx at low NOx conditions. The other was the suppression of new particle formation limiting the condensational sink for the SOA precursors. This effect could explain a substantial fraction of the decrease of SOA yield observed at high NOx.
We investigated NOx impacts on the formation of secondary organic aerosol (SOA) mass from...
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