Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 21 2007 10.5194/acp-7-5489-2007 http://www.atmos-chem-phys.net/7/5489/2007/ http://www.atmos-chem-phys.net/7/5489/2007/acp-7-5489-2007.html http://www.atmos-chem-phys.net/7/5489/2007/acp-7-5489-2007.pdf 5489 5499 2007-11-01 Intercomparison of ground-based ozone and NO₂ measurements during the MANTRA 2004 campaign A. Fraser amery@atmosp.physics.utoronto.ca P. F. Bernath R. D. Blatherwick J. R. Drummond P. F. Fogal D. Fu F. Goutail T. E. Kerzenmacher C. T. McElroy C. Midwinter J. R. Olson K. Strong K. A. Walker D. Wunch I. J. Young Department of Physics, University of Toronto, Toronto, Canada Department of Chemistry, University of Waterloo, Waterloo, Canada Department of Chemistry, University of York, Heslington, UK Department of Physics and Astronomy, University of Denver, Denver, USA Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada Service d'Aéronomie du Centre Nationale de la Recherche Scientifique, Verrières le Buisson, France Environment Canada, Downsview, Canada California Institute of Technology, Pasadena, USA The MANTRA (Middle Atmosphere Nitrogen TRend Assessment) 2004 campaign took place in Vanscoy, Saskatchewan, Canada (52° N, 107° W) from 3 August to 15 September, 2004. In support of the main balloon launch, a suite of five zenith-sky and direct-Sun-viewing UV-visible ground-based spectrometers was deployed, primarily measuring ozone and NO₂ total columns. Three Fourier transform spectrometers (FTSs) that were part of the balloon payload also performed ground-based measurements of several species, including ozone. Ground-based measurements of ozone and NO₂ differential slant column densities from the zenith-viewing UV-visible instruments are presented herein. They are found to partially agree within NDACC (Network for the Detection of Atmospheric Composition Change) standards for instruments certified for process studies and satellite validation. Vertical column densities of ozone from the zenith-sky UV-visible instruments, the FTSs, a Brewer spectrophotometer, and ozonesondes are compared, and found to agree within the combined error estimates of the instruments (15%). NO₂ vertical column densities from two of the UV-visible instruments are compared, and are also found to agree within combined error (15%). 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