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@ARTICLE{Zhao:155322,
      author       = {Zhao, Defeng and Kaminski, M. and Schlag, P. and Fuchs, H.
                      and Acir, I.-H. and Bohn, B. and Häseler, R. and
                      Kiendler-Scharr, A. and Rohrer, F. and Tillmann, R. and
                      Wang, Mingjin and Wegener, R. and Wildt, J. and Wahner, A.
                      and Mentel, T. F.},
      title        = {{S}econdary {O}rganic {A}erosol ({SOA}) formation from
                      hydroxyl radical oxidation and ozonolysis of monoterpenes},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {14},
      number       = {9},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2014-04495},
      pages        = {12591 - 12634},
      year         = {2014},
      abstract     = {Oxidation by hydroxyl radical (OH) and ozonolysis are the
                      two major pathways of daytime biogenic volatile organic
                      compounds (VOCs) oxidation and secondary organic aerosol
                      (SOA) formation. In this study, we investigated the particle
                      formation of several common monoterpenes (α-pinene,
                      β-pinene, and limonene) by OH dominated oxidation, which
                      has seldom been investigated. OH oxidation experiments were
                      carried out in the SAPHIR chamber in Jülich, Germany, at
                      low NOx (0.01–1 ppbV) and low ozone (O3) concentration. OH
                      concentration and OH reactivity were measured directly so
                      that the overall reaction rates of organic compounds with OH
                      were quantified. Multi-generation reaction process, particle
                      growth, new particle formation, particle yield, and chemical
                      composition were analyzed and compared with that of
                      monoterpene ozonolysis. Multi-generation products were found
                      to be important in OH dominated SOA formation. The relative
                      role of functionalization and fragmentation in the reaction
                      process of OH oxidation was analyzed by examining the
                      particle mass and the particle size as a function of OH
                      dose. We developed a novel method which quantitatively links
                      particle growth to the reaction of OH with organics in a
                      reaction system. This method was also used to analyze the
                      evolution of functionalization and fragmentation of organics
                      in the particle formation by OH oxidation. It shows that
                      functionalization of organics was dominant in the beginning
                      of the reaction (within two lifetimes of the monoterpene)
                      and fragmentation started to be dominant after that. We
                      compared particle formation from OH oxidation with that from
                      pure ozonolysis. In individual experiments, growth rates of
                      the particle size did not necessarily correlate with the
                      reaction rate of monoterpene with OH and O3. Comparing the
                      size growth rates at the similar reaction rates of
                      monoterpene with OH or O3 indicates that generally, OH
                      oxidation and ozonolysis had similar efficiency in particle
                      growth. The SOA yield of α-pinene and limonene by
                      ozonolysis was higher than that of OH oxidation. Aerosol
                      mass spectrometry (AMS) shows SOA elemental composition from
                      OH oxidation follows a slope shallower than −1 in the O /
                      C vs. H / C diagram, indicating that oxidation proceeds
                      without significant loss of hydrogen. SOA from OH oxidation
                      had higher H / C ratios than SOA from ozonolysis. In
                      ozonolysis, a process with significant hydrogen loss seemed
                      to play an important role in SOA formation.},
      cin          = {IEK-8 / IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IBG-2-20101118},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233) / HITEC - Helmholtz Interdisciplinary Doctoral
                      Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-233 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-14-12591-2014},
      url          = {https://juser.fz-juelich.de/record/155322},
}