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@MASTERSTHESIS{Betancourt:872971,
      author       = {Betancourt, Clara},
      title        = {{L}agrangian particle dispersion modeling of stable carbon
                      isotope ratios to track the chemical aging of biomass
                      burning aerosol},
      school       = {Universität zu Köln},
      type         = {Masterarbeit},
      reportid     = {FZJ-2020-00428},
      pages        = {69 p.},
      year         = {2019},
      note         = {Masterarbeit, Universität zu Köln, 2019},
      abstract     = {Biomass burning is an important source of atmospheric
                      pollutants in gas and particulate phase.These have an impact
                      on air quality, health and climate. Domestic heating with
                      firewood is amajor source of fine dust in Germany in the
                      cold season. So there is a strong scientific interestto
                      accurately quantify the contribution of local to remote
                      sources to the aerosol burden.In this work, a modeling
                      methodology is developed to simulate concentration and
                      isotoperatios of the biomass burning tracer levoglucosan. To
                      this end, retroplumes obtained withthe Lagrangian Particle
                      Dispersion Model (LPDM) FLEXPART are folded with
                      country-specificemission inventories. Since isotopes can
                      provide additional information on source and processingof
                      the sampled aerosol, the option to output stable carbon
                      isotope ratios of levoglucosan isimplemented in the model.
                      Sensitivity studies are conducted to determine governing
                      processes inthe employed model. Furthermore, the established
                      modeling routines are applied in a case study,with the goal
                      to assess the contribution of local vs. remote emissions
                      from firewood domesticheating to the particulate matter
                      sampled at two measurement stations of the North
                      Rhine-Westphalia Landesumweltamt (LANUV). This study focuses
                      on 50 selected aerosol samplestaken at an urban background
                      station in Mülheim-Styrum and at a rural background
                      stationin the Eifel, in the cold seasons of 2015 - 2017. The
                      measured concentration and isotopiccomposition of the
                      sampled levoglucosan are used to validate the modeling
                      method.The results show a good agreement between modeled and
                      observed concentrations. It isthough shown that at the urban
                      station, concentration measurements are partly influenced
                      byunresolved sources near by the sampling station. According
                      to the model outcome, the largestpart of the sampled aerosol
                      is 1 - 2 days old, and thus originates from local to
                      regional sources.Consequently, chemical aging has a minor
                      influence on the levoglucosan concentration andisotopic
                      composition in the modeled period. Additionally to the short
                      atmospheric residencetime, a low OH-concentration in the
                      cold season hinders chemical decay. On that account, itcan
                      be concluded that the observed -value variances are caused
                      only by variances in the isotoperatios at sources. The
                      sensitivity studies indicate that the main sink for the
                      investigated biomassburning aerosol is wet deposition. For
                      aged aerosol in the coarse mode, also gravitational
                      settlingis a considerable loss process.This work shows that
                      combining Lagrangian modeling with isotopic- and
                      concentration measurements,reliable information on the
                      biomass burning aerosol source is provided. The findingsshow
                      that the biomass burning aerosol burden in living areas is
                      of local origin and thus it can bemitigated by reducing
                      local emissions. Yet, a comprehensive benchmarking of source
                      specificisotopic ratios is still missing. Furthermore,
                      modeling studies investigating large scale fires insummer
                      are required, since they have the potential to contribute to
                      aging understanding.},
      cin          = {IEK-8 / JSC},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)JSC-20090406},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / Earth System Data
                      Exploration (ESDE)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel-1)ESDE},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/872971},
}