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@BOOK{Mensah:136283,
      author       = {Mensah, Amewu A.},
      title        = {{W}ater and organic nitrate detection in an {AMS}:
                      laboratory characterization and application to ambient
                      measurements},
      volume       = {104},
      school       = {Universität Köln},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136283},
      isbn         = {978-3-89336-698-9},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie und
                      Umwelt / Energy und Environment},
      pages        = {XI, 111 S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; Univ. Köln,
                      Diss., 2010},
      abstract     = {Atmospheric aerosols were studied by three different means.
                      Laboratory experiments determined the relative ionization
                      efficiency of water (RIE$_{H2O}$) in an Aerodyne Aerosol
                      Mass Spectrometers (AMS), simulation chamber experiments
                      gave insight to the reaction products of biogenic volatile
                      organic compounds (BVOC) oxidation products, and the
                      findings were applied to two field campaign measurements at
                      Cabauw, NL, in May 2008 and February 2009. Knowing the
                      liquid water content of aerosol particles is vital for the
                      assessment of their climate forcing potential. A value of 2
                      for RIE$_{H2O}$ was determined by studying oxalate salts
                      with different amounts of crystal water. BVOCs contribute
                      much more to the global budget of VOCs than anthropogenic
                      ones but oxidation products in terms of secondary organic
                      aerosol often correlate to anthropogenic tracers such as NOx
                      from fossil fuel burning. In atmospheric simulation chamber
                      experiments, organic nitrates from BVOC-NO$_{3}$ oxidation
                      showed higher vapor pressures than pure organic compounds
                      produced in the same reactions. Organic nitrates comprised
                      up to approx. 41 \% of the particulate phase. A specific
                      fragmentation ratio of nitrate (NO$_{2}^{+}$/NO$^{+}$) of
                      0.1 was found by high resolution AMS analysis differing
                      strongly from the value of 0.4 known for the most abundant
                      ambient NO$_{3}$ specie (NH$_{4}$NO$_{3}$). Ambient average
                      particulate mass loadings were 9.72 $\mu$g/m$^{3}$ dominated
                      by organics (40 \%) in 2008 and 5.62 $\mu$g/m3 dominated by
                      nitrate (42 \%) in 2009. Data comparison to collocated
                      instruments showed good agreement. Positive Matrix
                      Factorization analysis of the particulate organic fraction
                      distinguished semi and low volatile oxygenated organic
                      aerosol (OOA) as well as hydrocarbon like organic aerosol
                      (HOA) in both campaigns. An additional highly oxygenated OA
                      with a mass spectrum very similar to fulvic acid was found
                      in 2008. The average contribution of organic nitrate to the
                      particulate nitrate mass was 34.9 \% in 2008 and 5.2 \% in
                      2009.},
      cin          = {IEK-8},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/136283},
}