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@ARTICLE{Sarrafzadeh:808819,
      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 Hastie, Donald R. and Kiendler-Scharr, Astrid},
      title        = {{I}mpact of {NO}$_{x}$ and {OH} on secondary organic
                      aerosol ({SOA}) formation from β-pinene photooxidation},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2016-02432},
      pages        = {1 - 30},
      year         = {2016},
      abstract     = {In this study, the NOx dependence of secondary organic
                      aerosol (SOA) formation from β-pinene photooxidation was
                      comprehensively investigated in the Jülich Plant Atmosphere
                      Chamber. Consistent with the results of previous NOx studies
                      we found increases of SOA yields 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 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 to our assumption of OH recycling by
                      NO and to SOA yields being dependent on OH concentrations.
                      It 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). 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 overall effect of NOx on the SOA yield
                      from β-pinene photooxidation was moderate. Comparing with
                      β-pinene experiments, 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},
      doi          = {10.5194/acp-2016-336},
      url          = {https://juser.fz-juelich.de/record/808819},
}