AMT Atmospheric Measurement Techniques AMT Atmos. Meas. Tech. 1867-8548 Copernicus Publications Göttingen, Germany 10.5194/amt-5-927-2012 Validation of ACE and OSIRIS ozone and NO<sub>2</sub> measurements using ground-based instruments at 80° N Adams C. 1 Strong K. 1 Batchelor R. L. 1 15 Bernath P. F. 2 3 4 Brohede S. 5 Boone C. 2 Degenstein D. 6 Daffer W. H. 7 Drummond J. R. 1 8 Fogal P. F. 1 Farahani E. 1 Fayt C. 9 Fraser A. 1 16 Goutail F. 10 Hendrick F. 9 Kolonjari F. 1 Lindenmaier R. 1 Manney G. 7 11 McElroy C. T. 12 13 McLinden C. A. 13 Mendonca J. 1 Park J.-H. 1 Pavlovic B. 1 Pazmino A. 10 Roth C. 6 Savastiouk V. 14 Walker K. A. 1 2 Weaver D. 1 Zhao X. 1 Department of Physics, University of Toronto, Toronto, Canada Department of Chemistry, University of Waterloo, Waterloo, Canada Department of Chemistry, University of York, York, UK Department of Chemistry & Biochemistry, Old Dominion University, Norfolk, VA, USA Global Environmental Measurements and Modelling, Department of Earth and Space Sciences, Chalmers University of Technology, 412 96 Göteborg, Sweden University of Saskatchewan, Saskatoon, Saskatchewan, Canada Jet Propulsion Laboratory, California Insititute of Technology, Pasadena, USA Department of Physics and Atmospheric Sciences, Dalhousie University, Halifax, Canada Institut d'Aeronomie Spatiale de Belgique (IASB-BIRA), Brussels, Belgium Versailles St-Quentin, CNRS/INSU, LATMOS-IPSL, 78280 Guyancourt, France New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA York University, Toronto, Ontario, Canada Environment Canada, Downsview, Ontario, Canada Full Spectrum Science Inc., Toronto, Ontario, Canada now at: Atmospheric Chemistry Division, NCAR Earth Systems Laboratory, Boulder, Colorado, USA now at: School of GeoSciences, University of Edinburgh, Edinburgh, UK 04 05 2012 5 5 927 953 Copyright: © 2012 C. Adams et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://amt.copernicus.org/articles/5/927/2012/amt-5-927-2012.html The full text article is available as a PDF file from https://amt.copernicus.org/articles/5/927/2012/amt-5-927-2012.pdf

The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since 2001 and 2003, respectively. This paper presents intercomparisons between ozone and NO<sub>2</sub> measured by the ACE and OSIRIS satellite instruments and by ground-based instruments at the Polar Environment Atmospheric Research Laboratory (PEARL), which is located at Eureka, Canada (80° N, 86° W) and is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). The ground-based instruments included in this study are four zenith-sky differential optical absorption spectroscopy (DOAS) instruments, one Bruker Fourier transform infrared spectrometer (FTIR) and four Brewer spectrophotometers. Ozone total columns measured by the DOAS instruments were retrieved using new Network for the Detection of Atmospheric Composition Change (NDACC) guidelines and agree to within 3.2%. The DOAS ozone columns agree with the Brewer spectrophotometers with mean relative differences that are smaller than 1.5%. This suggests that for these instruments the new NDACC data guidelines were successful in producing a homogenous and accurate ozone dataset at 80° N. Satellite 14–52 km ozone and 17–40 km NO<sub>2</sub> partial columns within 500 km of PEARL were calculated for ACE-FTS Version 2.2 (v2.2) plus updates, ACE-FTS v3.0, ACE-MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) v1.2 and OSIRIS SaskMART v5.0x ozone and Optimal Estimation v3.0 NO<sub>2</sub> data products. The new ACE-FTS v3.0 and the validated ACE-FTS v2.2 partial columns are nearly identical, with mean relative differences of 0.0 ± 0.2% and −0.2 ± 0.1% for v2.2 minus v3.0 ozone and NO<sub>2</sub>, respectively. Ozone columns were constructed from 14–52 km satellite and 0–14 km ozonesonde partial columns and compared with the ground-based total column measurements. The satellite-plus-sonde measurements agree with the ground-based ozone total columns with mean relative differences of 0.1–7.3%. For NO<sub>2</sub>, partial columns from 17 km upward were scaled to noon using a photochemical model. Mean relative differences between OSIRIS, ACE-FTS and ground-based NO<sub>2</sub> measurements do not exceed 20%. ACE-MAESTRO measures more NO<sub>2</sub> than the other instruments, with mean relative differences of 25–52%. Seasonal variation in the differences between NO<sub>2</sub> partial columns is observed, suggesting that there are systematic errors in the measurements and/or the photochemical model corrections. For ozone spring-time measurements, additional coincidence criteria based on stratospheric temperature and the location of the polar vortex were found to improve agreement between some of the instruments. For ACE-FTS v2.2 minus Bruker FTIR, the 2007–2009 spring-time mean relative difference improved from −5.0 ± 0.4% to −3.1 ± 0.8% with the dynamical selection criteria. This was the largest improvement, likely because both instruments measure direct sunlight and therefore have well-characterized lines-of-sight compared with scattered sunlight measurements. For NO<sub>2</sub>, the addition of a ±1° latitude coincidence criterion improved spring-time intercomparison results, likely due to the sharp latitudinal gradient of NO<sub>2</sub> during polar sunrise. The differences between satellite and ground-based measurements do not show any obvious trends over the missions, indicating that both the ACE and OSIRIS instruments continue to perform well.

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