Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 6 2007 10.5194/acpd-7-16283-2007 http://www.atmos-chem-phys-discuss.net/7/16283/2007/ http://www.atmos-chem-phys-discuss.net/7/16283/2007/acpd-7-16283-2007.html http://www.atmos-chem-phys-discuss.net/7/16283/2007/acpd-7-16283-2007.pdf 16283 16347 2007-11-23 Intercomparison of UV-visible measurements of ozone and NO₂ during the Canadian Arctic ACE validation campaigns: 2004–2006 A. Fraser F. Goutail K. Strong P. F. Bernath C. Boone W. H. Daffer J. R. Drummond D. G. Dufour T. E. Kerzenmacher G. L. Manney C. T. McElroy C. Midwinter C. A. McLinden F. Nichitiu C. R. Nowlan J. Walker K. A. Walker H. Wu J. Zou Department of Physics, University of Toronto, Toronto, Canada Service d'Aéronomie du Centre Nationale de la Recherche Scientifique, Verrières le Buisson, France Department of Chemistry, University of York, Heslington, UK Department of Chemistry, University of Waterloo, Waterloo, Canada Columbus Technologies and Services Inc., Pasadena, USA Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada Picomole Instruments Inc., Edmonton, Canada Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA New Mexico Institute of Mining and Technology, Socorro, USA Environment Canada, Downsview, Canada The first three Canadian Arctic ACE validation campaigns were held during polar sunrise at Eureka, Nunavut, Canada (80° N, 86° W) from 2004 to 2006 in support of validation of the ACE (Atmospheric Chemistry Experiment) satellite mission. Three or four zenith-sky viewing UV-visible spectrometers have taken part in each of the three campaigns. The differential slant column densities and vertical column densities from these instruments have been compared following the methods of the UV-visible Working Group of the NDACC (Network for Detection of Atmospheric Composition Change). The instruments are found to partially agree within the required accuracies for both species, although both the vertical and slant column densities are more scattered than required. This might be expected given the spatial and temporal variability of the Arctic stratosphere in spring. The vertical column densities are also compared to integrated total columns from ozonesondes and integrated partial columns from the ACE-FTS (ACE-Fourier Transform Spectrometer) and ACE-MAESTRO (ACE-Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) instruments on board ACE. For both species, the columns from the ground-based instruments and the ozonesondes are found to generally agree within their combined error bars. 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