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@PHDTHESIS{Rolletter:894916,
      author       = {Rolletter, Michael},
      title        = {{E}xperimental study of the chemical degradation of
                      biogenic volatile organic compounds by atmospheric {OH}
                      radicals},
      volume       = {550},
      school       = {Universität Köln},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-03478},
      isbn         = {978-3-95806-568-0},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {XIII, 199 S.},
      year         = {2021},
      note         = {Universität Köln, Diss., 2021},
      abstract     = {Approximately 1000 Tg of carbon is annually emitted by
                      biogenic sources. In the atmosphere, these compounds are
                      oxidized and thereby secondary air pollutants are formed
                      such as secondary organic aerosol (SOA) and ozone, thus
                      contributing to air quality and climate change. At daytime,
                      biogenic volatile organic compounds (BVOCs) are mainly
                      degraded by photolytically produced hydroxyl (OH) radicals.
                      In the presence of nitric oxide (NO), OH initiated reactions
                      proceed through radical chain reactions that involve organic
                      peroxy radicals (RO$_{2}$). In field studies conducted in
                      forested environments, which were characterized by large
                      BVOC emissions and low NO concentrations, measured OH
                      concentrations were largely underestimated by model
                      calculations using state-of-the-art chemical models, thus
                      underestimating the oxidative capacity of the atmosphere. In
                      the degradation scheme of isoprene, the BVOC with the
                      globally highest emission rate, new chemical pathways for OH
                      regeneration that involve unimolecular reactions of RO$_{2}$
                      have been discovered. However, few studies exist, which
                      investigate radical regeneration in the photooxidation of
                      other abundant hydrocarbons and monoterpenes. This thesis
                      aims for investigating potential new pathways for radical
                      regeneration in the photooxidation of three selected BVOCs
                      that were abundant in previous field campaigns:
                      2-methyl-3-butene-2-ol (MBO), α-pinene, and the oxidation
                      production of α-pinene, pinonaldehyde. In total, five
                      experiments, which were conducted in 2012 and 2014 in the
                      atmospheric simulation chamber SAPHIR (Simulation of
                      Atmospheric PHotochemistry In a large Reaction chamber), are
                      analyzed. A comprehensive set of instruments provided
                      concentration measurements of OH and hydroperoxy (HO$_{2}$)
                      radicals, OH reactivity, injected BVOCs, formed oxidation
                      products, NO$_{x}$ (= NO + NO$_{2}$), and measurements of
                      physical parameters (radiation, temperature, and pressure).
                      In contrast to previous studies, all experiments were
                      performed at ambient reactant concentrations and low NO
                      mixing ratios (<220 pptv, parts per trillion by volume) to
                      simulate conditions that are typical in forested regions.
                      [...]},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/894916},
}