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@ARTICLE{Sarrafzadeh:818333,
      author       = {Sarrafzadeh, Mehrnaz and Wildt, Jürgen and Pullinen, Iida
                      and Springer, Monika and Kleist, Einhard and Tillmann, Ralf
                      and Schmitt, Sebastian and Wu, Cheng and Mentel, Thomas F.
                      and Zhao, Defeng and Hastie, Donald R. and Kiendler-Scharr,
                      Astrid},
      title        = {{I}mpact of {NO}x and {OH} on secondary organic aerosol
                      formation from β-pinene photooxidation},
      journal      = {Atmospheric chemistry and physics},
      volume       = {16},
      number       = {17},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-04805},
      pages        = {11237 - 11248},
      year         = {2016},
      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.},
      cin          = {IEK-8 / IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IBG-2-20101118},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000384199500002},
      doi          = {10.5194/acp-16-11237-2016},
      url          = {https://juser.fz-juelich.de/record/818333},
}