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@PHDTHESIS{Yu:856524,
      author       = {Yu, Zhujun},
      title        = {{C}hamber study of biogenic volatile organic compounds:
                      plant emission, oxidation products and their {OH}
                      reactivity},
      volume       = {436},
      school       = {Universität Wuppertal},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-05911},
      isbn         = {978-3-95806-356-3},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {ix, 139 S.},
      year         = {2018},
      note         = {Universität Wuppertal, Diss., 2018},
      abstract     = {Volatile organic compounds (VOC)(Fuchs et al., 2017) are
                      ubiquitous in the atmosphere with an estimated atmospheric
                      VOC species of 10$^{4}$-10$^{5}$. Natural and anthropogenic
                      activities emit VOCs into the atmosphere, with about 90\% of
                      the global VOC emissions originating from land vegetation.
                      VOCs play a vital role in the global carbon budget and in
                      the regional formation of ozone in the troposphere. They can
                      also serve as a source of secondary organic aerosol (SOA).
                      Atmospheric lifetime of VOCs varies from minutes to years
                      and is predominantly determined by the reactions with
                      hydroxyl radical (OH), nitrate radical (NO$_{3}$), or ozone
                      (O$_{3}$). By atmospheric VOCs oxidation intermediate
                      products are formed. The detailed chemical mechanisms
                      involved are insufficiently known to date and need to be
                      understood for air quality management and climate change
                      predictions. OH radical as the primary oxidant in the
                      troposphere, initiates the degradation of nearly all types
                      of VOCs. The total OH reactivity is the first-order loss
                      rate of OH in reaction with compounds present in ambient
                      air, which provides an insight of the total loading of
                      reactive compounds in the atmosphere. Previous studies
                      comparing directly measured OH reactivity with that
                      calculated from VOC measurements often reported a "missing
                      OH reactivity" in the calculated one, suggesting the
                      existence of unquantified OH sink terms. This work presents
                      the emission of Biogenic VOCs (BVOCs) from 7 sets of trees
                      and the oxidation of VOCs in a chamber system. The focus of
                      this work is to investigate the atmospheric degradation of
                      VOCs and to improve the knowledge of the sum of reactive
                      trace gases involved in atmospheric processes by using the
                      OH reactivity parameter. A Proton-Transfer-Reaction
                      Time-of-Flight Mass Spectrometer (PTR-TOF-MS) was used for
                      real-time measurements of VOCs. Monoterpene and
                      sesquiterpene speciations from an offline gas-chromatograph
                      (GC) measurements were adopted forOHreactivity calculation
                      due to the reaction rate coefficient difference among
                      different monoterpenes and sesquiterpenes. The
                      intercomparison between PTR and online GC during the
                      selected campaigns exhibited that the measured
                      concentrations of the main reactants used in this study
                      (isoprene, monoterpenes and benzene-D$_{6}$) were linearly
                      correlated and differed within 15\%. The newly built plant
                      chamber SAPHIR-PLUS was characterized with the average BVOCs
                      transfer efficiency of 0.85 from inlet to outlet, and 0.8
                      from PLUS to the atmosphere simulation chamber SAPHIR. The
                      BVOCs emission pattern from $\textit{Quercus ilex}$ trees
                      has been determined by the use of SAPHIR-PLUS. The detected
                      BVOCs emissions were dominated by monoterpenes, with minor
                      emissions of isoprene and methanol, consistent with the
                      overall emission pattern typical for $\textit{Quercus ilex}$
                      trees in the growing season. Monoterpenes and isoprene
                      emissions showed to be triggered by light rather than
                      temperature, because these two compounds have no storage
                      pools in $\textit{Quercus ilex}$, their release are thus
                      directly connected with the photosynthesis processes in the
                      plant. Additionally, their emissions showed clear
                      exponential temperature dependence under constant light
                      condition, with a slope of 0.11 $\pm$ 0.02
                      $^{\circ}$C$^{-1}$ for monoterpenes emission. As a tracer
                      for leaf growth, methanol emission exhibited an abrupt
                      increase at the beginning of illumination. This was
                      explained as instantaneous release from stomata of leaves,
                      that stored produced methanol during the night and opened
                      upon light exposure. Emission of methanol increased linearly
                      with temperature.},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2018120623},
      url          = {https://juser.fz-juelich.de/record/856524},
}