31 May 2022
31 May 2022
Status: a revised version of this preprint was accepted for the journal ACP.

Water vapour and ozone in the upper troposphere – lower stratosphere: Global climatologies from three Canadian limb-viewing instruments

Paul S. Jeffery1, Kaley A. Walker1, Chris E. Sioris2, Chris D. Boone3, Doug Degenstein4, Gloria L. Manney5,6, C. Thomas McElroy7, Luis Millán8, David A. Plummer9, Niall J. Ryan1, Patrick E. Sheese1, and Jiansheng Zou1 Paul S. Jeffery et al.
  • 1Department of Physics, University of Toronto, Toronto, ON, M5S 1A7, Canada
  • 2Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON, M3H 5T4, Canada
  • 3Department of Chemistry, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
  • 4Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada
  • 5NorthWest Research Associates, Socorro, NM, 87801, USA
  • 6Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM, 87801, USA
  • 7Department of Earth and Space Science and Engineering, York University, Toronto, ON, M3J 1P3, Canada
  • 8Jet Propulsion Laboratory, Pasadena, CA, 91109, USA
  • 9Climate Research Branch, Environment and Climate Change Canada, Dorval, QC, H9P 1J3, Canada

Abstract. This study presents upper troposphere – lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS), the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO), and the Optical Spectrograph and InfraRed Imaging System (OSIRIS; ozone only). This selection of instruments was chosen to explore the capability of these Canadian instruments in representing the UTLS, and to enable analysis of the impact of different measurement sampling patterns. The water vapour and ozone climatologies have been constructed using tropopause-relative potential temperature and equivalent latitude coordinates in an effort to best represent the distribution of these two gases in the UTLS, which is characterized by a high degree of dynamic and geophysical variability. Zonal-mean multiyear-mean climatologies are provided with 5° equivalent latitude and 10K potential temperature spacing, and have been constructed on a monthly, seasonal (3-month), and yearly basis. These climatologies are examined in-depth for two 3-month periods, December–January–February and June–July–August, and are compared to reference climatologies constructed from the Canadian Middle Atmosphere Model 39-year specified dynamics (CMAM39-SD) run, subsampled to the times and locations of the satellite measurements, in order to evaluate the consistency of water vapour and ozone between the datasets. Specifically, this method of using a subsampled model addresses the impact of each instrument’s measuring pattern, and allows for the quantification of the influence of different measurement patterns on multiyear climatologies. In turn, this permits a consistent evaluation of the measurements of these two gas species. For the water vapour climatologies produced, a less than 8 % overall difference was found between the climatologies generated from the two versions of ACE-FTS, while comparisons with the MAESTRO climatologies were found to yield 15–41 % overall differences, depending on the version of ACE-FTS and the season. When considering the ozone climatologies, those constructed from the two ACE-FTS 20 versions agreed to within 2 % overall, and the OSIRIS ozone climatologies agreed with these to within 10 %. The MAESTRO ozone climatologies were found to differ from ACE-FTS and OSIRIS by about 30–35 % for the former, and 25 % for the latter, albeit with regions of better agreement within the UTLS. Overall these findings indicate that this set of Canadian limb sounders provide consistent water vapour and ozone distributions in the UTLS.

Paul S. Jeffery et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Nice UTLS climatologies in tropopause relative coordinates', Anonymous Referee #1, 21 Jun 2022
  • RC2: 'Comment on acp-2022-345', Anonymous Referee #2, 25 Jul 2022

Paul S. Jeffery et al.

Paul S. Jeffery et al.


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Short summary
The upper troposphere – lower stratosphere is one of the most variable regions in the atmosphere. To improve our understanding of water vapour and ozone concentrations in this region, climatologies have been developed from 14 years of measurements from three Canadian satellite instruments. Horizontal and vertical coordinates have been chosen to minimize the effects of variability. To aid in analysis, model simulations have been used to characterize differences between the instrument data sets.