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@ARTICLE{Fuchs:838676,
      author       = {Fuchs, Hendrik and Novelli, Anna and Hofzumahaus, Andreas
                      and Pfannerstill, Eva Y. and Kessel, Stephan and Edtbauer,
                      Achim and Williams, Jonathan and Michoud, Vincent and
                      Dusanter, Sebastien and Locoge, Nadine and Zannoni, Nora and
                      Gros, Valerie and Truong, Francois and Sarda-Esteve, Roland
                      and Cryer, Danny R. and Brumby, Charlotte A. and Whalley,
                      Lisa K. and Stone, Daniel and Seakins, Paul W. and Heard,
                      Dwayne E. and Schoemaecker, Coralie and Blocquet, Marion and
                      Coudert, Sebastien and Batut, Sebastien and Fittschen,
                      Christa and Thames, Alexander B. and Brune, William H. and
                      Ernest, Cheryl and Harder, Hartwig and Muller, Jennifer B.
                      A. and Elste, Thomas and Kubistin, Dagmar and Bohn, Birger
                      and Hohaus, Thorsten and Holland, Frank and Li, Xin and
                      Rohrer, Franz and Kiendler-Scharr, Astrid and Tillmann, Ralf
                      and Wegener, Robert and Yu, Zhujun and Zou, Qi and Wahner,
                      Andreas and Rolletter, Michael and Andres, Stefanie},
      title        = {{C}omparison of {OH} reactivity measurements in the
                      atmospheric simulation chamber {SAPHIR}},
      journal      = {Atmospheric measurement techniques},
      volume       = {10},
      number       = {10},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2017-07242},
      pages        = {4023 - 4053},
      year         = {2017},
      abstract     = {Hydroxyl (OH) radical reactivity (kOH) has been measured
                      for 18 years with different measurement techniques. In order
                      to compare the performances of instruments deployed in the
                      field, two campaigns were conducted performing experiments
                      in the atmospheric simulation chamber SAPHIR at
                      Forschungszentrum Jülich in October 2015 and April 2016.
                      Chemical conditions were chosen either to be representative
                      of the atmosphere or to test potential limitations of
                      instruments. All types of instruments that are currently
                      used for atmospheric measurements were used in one of the
                      two campaigns. The results of these campaigns demonstrate
                      that OH reactivity can be accurately measured for a wide
                      range of atmospherically relevant chemical conditions (e.g.
                      water vapour, nitrogen oxides, various organic compounds) by
                      all instruments. The precision of the measurements (limit of
                      detection  < 1 s−1 at a time resolution of 30 s
                      to a few minutes) is higher for instruments directly
                      detecting hydroxyl radicals, whereas the indirect
                      comparative reactivity method (CRM) has a higher limit of
                      detection of 2 s−1 at a time resolution of 10 to
                      15 min. The performances of the instruments were
                      systematically tested by stepwise increasing, for example,
                      the concentrations of carbon monoxide (CO), water vapour or
                      nitric oxide (NO). In further experiments, mixtures of
                      organic reactants were injected into the chamber to simulate
                      urban and forested environments. Overall, the results show
                      that the instruments are capable of measuring OH reactivity
                      in the presence of CO, alkanes, alkenes and aromatic
                      compounds. The transmission efficiency in Teflon inlet lines
                      could have introduced systematic errors in measurements for
                      low-volatile organic compounds in some instruments. CRM
                      instruments exhibited a larger scatter in the data compared
                      to the other instruments. The largest differences to
                      reference measurements or to calculated reactivity were
                      observed by CRM instruments in the presence of terpenes and
                      oxygenated organic compounds (mixing ratio of OH reactants
                      were up to 10 ppbv). In some of these experiments, only a
                      small fraction of the reactivity is detected. The accuracy
                      of CRM measurements is most likely limited by the
                      corrections that need to be applied to account for known
                      effects of, for example, deviations from pseudo first-order
                      conditions, nitrogen oxides or water vapour on the
                      measurement. Methods used to derive these corrections vary
                      among the different CRM instruments. Measurements taken with
                      a flow-tube instrument combined with the direct detection of
                      OH by chemical ionisation mass spectrometry (CIMS) show
                      limitations in cases of high reactivity and high NO
                      concentrations but were accurate for low reactivity
                      (< 15 s−1) and low NO (< 5 ppbv) conditions.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000413853400004},
      doi          = {10.5194/amt-10-4023-2017},
      url          = {https://juser.fz-juelich.de/record/838676},
}