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@ARTICLE{Nussbaumer:902286,
      author       = {Nussbaumer, Clara M. and Parchatka, Uwe and Tadic, Ivan and
                      Bohn, Birger and Marno, Daniel and Martinez, Monica and
                      Rohloff, Roland and Harder, Hartwig and Kluge, Flora and
                      Pfeilsticker, Klaus and Obersteiner, Florian and Zöger,
                      Martin and Doerich, Raphael and Crowley, John N. and
                      Lelieveld, Jos and Fischer, Horst},
      title        = {{M}odification of a conventional photolytic converter for
                      improving aircraft measurements of ${NO}\<sub\>2\</sub\>$
                      via chemiluminescence},
      journal      = {Atmospheric measurement techniques},
      volume       = {14},
      number       = {10},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2021-04149},
      pages        = {6759 - 6776},
      year         = {2021},
      abstract     = {Nitrogen oxides (NOx≡NO+NO2) are centrally involved in
                      the photochemical processes taking place in the Earth's
                      atmosphere. Measurements of NO2, particularly in remote
                      areas where concentrations are of the order of parts per
                      trillion by volume (pptv), are still a challenge and subject
                      to extensive research. In this study, we present NO2
                      measurements via photolysis–chemiluminescence during the
                      research aircraft campaign CAFE Africa (Chemistry of the
                      Atmosphere – Field Experiment in Africa) 2018 around Cabo
                      Verde and the results of laboratory experiments to
                      characterize the photolytic converter used. We find the NO2
                      reservoir species MPN (methyl peroxy nitrate) to produce the
                      only relevant thermal interference in the converter under
                      the operating conditions during CAFE Africa. We identify a
                      memory effect within the conventional photolytic converter
                      (type 1) associated with high NO concentrations and rapidly
                      changing water vapor concentrations, accompanying changes in
                      altitude during aircraft measurements, which is due to the
                      porous structure of the converter material. As a result, NO2
                      artifacts, which are amplified by low conversion
                      efficiencies, and a varying instrumental background
                      adversely affect the NO2 measurements. We test and
                      characterize an alternative photolytic converter (type 2)
                      made from quartz glass, which improves the reliability of
                      NO2 measurements in laboratory and field studies.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000710519000001},
      doi          = {10.5194/amt-14-6759-2021},
      url          = {https://juser.fz-juelich.de/record/902286},
}