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@ARTICLE{Gensch:857781,
      author       = {Gensch, I. and Sang-Arlt, X. F. and Laumer, W. and Chan, C.
                      Y. and Engling, G. and Rudolph, J. and Kiendler-Scharr, A.},
      title        = {{U}sing δ 13 {C} of {L}evoglucosan {A}s a {C}hemical
                      {C}lock},
      journal      = {Environmental science $\&$ technology},
      volume       = {52},
      number       = {19},
      issn         = {1520-5851},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2018-06748},
      pages        = {11094 - 11101},
      year         = {2018},
      abstract     = {Compound specific carbon isotopic measurements (δ13C) of
                      levoglucosan were carried out for ambient aerosol sampled
                      during an intensive biomass burning period at different
                      sites in Guangdong province, China. The δ13C of ambient
                      levoglucosan was found to be noticeably heavier than the
                      average δ13C of levoglucosan found in source
                      C3-plant-combustion samples. To estimate the photochemical
                      age of sampled ambient levoglucosan, back trajectory
                      analyses were done. The origin and pathways of the probed
                      air masses were determined, using the
                      Lagrangian-particle-dispersion-model FLEXPART and ECMWF
                      meteorological data. On the other hand, the isotopic
                      hydrocarbon clock concept was applied to relate the changes
                      in the field-measured stable carbon isotopic composition to
                      the extent of chemical processing during transport.
                      Comparison of the photochemical age derived using these two
                      independent approaches shows on average good agreement,
                      despite a substantial scatter of the individual data pairs.
                      These analyses demonstrate that the degree of oxidative
                      aging of particulate levoglucosan can be quantified by
                      combining laboratory KIE studies, observed δ13C at the
                      source and in the field, as well as back trajectory
                      analyses. In this study, the chemical loss of levoglucosan
                      was found to exceed $50\%$ in one-fifth of the analyzed
                      samples. Consequently, the use of levoglucosan as a stable
                      molecular tracer may underestimate the contribution of
                      biomass burning to air pollution.},
      cin          = {IEK-8},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30169962},
      UT           = {WOS:000446542100022},
      doi          = {10.1021/acs.est.8b03054},
      url          = {https://juser.fz-juelich.de/record/857781},
}