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@ARTICLE{Fuchs:22396,
      author       = {Fuchs, H. and Dorn, H.-P. and Bachner, M. and Bohn, B. and
                      Brauers, T. and Gomm, S. and Hofzumahaus, H. and Holland, F.
                      and Nehr, S. and Rohrer, F. and Tillmann, R. and Wahner, A.},
      title        = {{C}omparison of {OH} concentration measurements by {DOAS}
                      and {LIF} during {SAPHIR} chamber experiments at high {OH}
                      reactivity and low {NO} concentration},
      journal      = {Atmospheric measurement techniques},
      volume       = {5},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-22396},
      pages        = {1611 - 1626},
      year         = {2012},
      note         = {This work was supported by the EU FP-7 program EUROCHAMP-2
                      (grant agreement no. 228335) and by the EU FP-7 program
                      PEGASOS (grant agreement no. 265307). S. Nehr and B. Bohn
                      thank the Deutsche Forschungsgemeinschaft for funding under
                      grant BO 1580/3-1. We thank M. Kaminski, R. Wegener, K. D.
                      Lu, X. Li, A. Buchholz, P. Schlag, H.-C. Wu, S. Dixneuf, P.
                      Musgen and R. Haseler for additional measurements during
                      this campaign and technical support.},
      abstract     = {During recent field campaigns, hydroxyl radical (OH)
                      concentrations that were measured by laser-induced
                      fluorescence (LIF) were up to a factor of ten larger than
                      predicted by current chemical models for conditions of high
                      OH reactivity and low NO concentration. These discrepancies,
                      which were observed in forests and urban-influenced rural
                      environments, are so far not entirely understood. In summer
                      2011, a series of experiments was carried out in the
                      atmosphere simulation chamber SAPHIR in Julich, Germany, in
                      order to investigate the photochemical degradation of
                      isoprene, methyl-vinyl ketone (MVK), methacrolein (MACR) and
                      aromatic compounds by OH. Conditions were similar to those
                      experienced during the PRIDE-PRD2006 campaign in the Pearl
                      River Delta (PRD), China, in 2006, where a large difference
                      between OH measurements and model predictions was found.
                      During experiments in SAPHIR, OH was simultaneously detected
                      by two independent instruments: LIF and differential optical
                      absorption spectroscopy (DOAS). Because DOAS is an
                      inherently calibration-free technique, DOAS measurements are
                      regarded as a reference standard. The comparison of the two
                      techniques was used to investigate potential artifacts in
                      the LIF measurements for PRD-like conditions of OH
                      reactivities of 10 to 30 s(-1) and NO mixing ratios of 0.1
                      to 0.3 ppbv. The analysis of twenty experiment days shows
                      good agreement. The linear regression of the combined data
                      set (averaged to the DOAS time resolution, 2495 data points)
                      yields a slope of 1.02 +/- 0.01 with an intercept of (0.10
                      +/- 0.03) x 10(6) cm(-3) and a linear correlation
                      coefficient of R-2 = 0.86. This indicates that the
                      sensitivity of the LIF instrument is well-defined by its
                      calibration procedure. No hints for artifacts are observed
                      for isoprene, MACR, and different aromatic compounds. LIF
                      measurements were approximately $30-40\%$ (median) larger
                      than those by DOAS after MVK (20 ppbv) and toluene (90 ppbv)
                      had been added. However, this discrepancy has a large
                      uncertainty and requires further laboratory investigation.
                      Observed differences between LIF and DOAS measurements are
                      far too small to explain the unexpected high OH
                      concentrations during the PRIDE-PRD2006 campaign.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima / EUROCHAMP-2 - Integration of
                      European Simulation Chambers for Investigating Atmospheric
                      Processes - Part 2 (228335) / BROWSE - Bystanders,
                      Residents, Operators and WorkerS Exposure models for plant
                      protection products (265307)},
      pid          = {G:(DE-Juel1)FUEK491 / G:(EU-Grant)228335 /
                      G:(EU-Grant)265307},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000306975500008},
      doi          = {10.5194/amt-5-1611-2012},
      url          = {https://juser.fz-juelich.de/record/22396},
}