Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 5 2009 10.5194/amtd-2-2539-2009 http://www.atmos-meas-tech-discuss.net/2/2539/2009/ http://www.atmos-meas-tech-discuss.net/2/2539/2009/amtd-2-2539-2009.html http://www.atmos-meas-tech-discuss.net/2/2539/2009/amtd-2-2539-2009.pdf 2539 2586 2009-10-08 Intercomparison of measurements of NO₂ concentrations in the atmosphere simulation chamber SAPHIR during the NO3Comp campaign H. Fuchs S. M. Ball B. Bohn T. Brauers R. C. Cohen H.-P. Dorn W. P. Dubé J. L. Fry R. Häseler U. Heitmann R. L. Jones J. Kleffmann T. F. Mentel P. Müsgen F. Rohrer A. W. Rollins A. A. Ruth A. Kiendler-Scharr E. Schlosser A. J. L. Shillings R. Tillmann R. M. Varma D. S. Venables G. Villena Tapia A. Wahner R. Wegener P. J. Wooldridge S. S. Brown National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Boulder, CO, USA Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA Department of Chemistry, University of Leicester, Leicester, UK Institut für Chemie und Dynamik der Geosphäre 2, Forschungszentrum Jülich GmbH, Jülich, Germany Department of Chemistry, University of California Berkeley, Berkeley, CA, USA Department of Physics, University College Cork, Cork, Ireland Department of Chemistry, University of Cambridge, Cambridge, UK Physikalische Chemie/Fachbereich C, Bergische Universität Wuppertal, Wuppertal, Germany Department of Chemistry, University College Cork, Cork, Ireland Environmental Research Institute, University College Cork, Cork, Ireland now at: Institut für Chemie und Dynamik der Geosphäre 2, Forschungszentrum Jülich GmbH, Jülich, Germany NO₂ concentrations were measured by various instruments during the NO3Comp campaign at the atmosphere simulation chamber SAPHIR at Forschungszentrum Jülich, Germany, in June 2007. Analytic methods included photolytic conversion with chemiluminescence (PC-CLD), broadband cavity ring-down spectroscopy (BBCRDS), pulsed cavity ring-down spectroscopy (CRDS), incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS), and laser-induced fluorescence (LIF). All broadband absorption spectrometers were optimized for the detection of the main target species of the campaign, NO₂, but were also capable of detecting NO₂ simultaneously with reduced sensitivity. NO₂ mixing ratios in the chamber were within a range characteristic of polluted, urban conditions, with a maximum mixing ratio of approximately 75 ppbv. The overall agreement between measurements of all instruments was excellent. Linear fits of the combined data sets resulted in slopes that differ from unity only within the stated uncertainty of each instrument. Possible interferences from species such as water vapor and ozone were negligible under the experimental conditions. 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