Preprints
https://doi.org/10.5194/amt-2023-220
https://doi.org/10.5194/amt-2023-220
24 Nov 2023
 | 24 Nov 2023
Status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

The transition to new ozone absorption cross-sections for Dobson and Brewer total ozone measurements

Karl Voglmeier, Voltaire Velazco, Luca Egli, Julian Gröbner, Alberto Redondas, and Wolfgang Steinbrecht

Abstract. Comparison of total ozone column (TOC) measurements from ground-based Dobson and Brewer spectrophotometers and from various satellite instruments generally reveals seasonally varying differences of a few percent. A large part of these differences has been attributed to the operationally used Bass & Paur ozone cross-sections and the lack of accounting for varying stratospheric temperatures in the standard total ozone retrieval for Dobson. This paper demonstrates how the use of new ozone absorption cross sections from the University of Bremen (Weber et al., 2016), as recommended by the committee on Absorption Cross-Sections of Ozone, the application of appropriate slit functions, especially for the Dobson instrument (Bernhard et al. 2005), and the use of climatological values for the effective ozone layer temperature (Teff), e.g. from TEMIS, essentially eliminate these seasonally varying differences between Dobson and Brewer total ozone data. Applying this approach to the existing global network of Dobson spectrometers will reduce the uncertainty of their total ozone data, from previously 3 to 4 % to better than 2.0 % at most locations.

Karl Voglmeier, Voltaire Velazco, Luca Egli, Julian Gröbner, Alberto Redondas, and Wolfgang Steinbrecht

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-220', Anonymous Referee #1, 12 Dec 2023
  • RC2: 'Comment on amt-2023-220', Anonymous Referee #3, 22 Dec 2023
  • RC3: 'Comment on amt-2023-220', Anonymous Referee #2, 29 Dec 2023
  • CC1: 'Issue with slit function by Bernhard shown in Figure 2b', Germar Bernhard, 02 Jan 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-220', Anonymous Referee #1, 12 Dec 2023
  • RC2: 'Comment on amt-2023-220', Anonymous Referee #3, 22 Dec 2023
  • RC3: 'Comment on amt-2023-220', Anonymous Referee #2, 29 Dec 2023
  • CC1: 'Issue with slit function by Bernhard shown in Figure 2b', Germar Bernhard, 02 Jan 2024
Karl Voglmeier, Voltaire Velazco, Luca Egli, Julian Gröbner, Alberto Redondas, and Wolfgang Steinbrecht
Karl Voglmeier, Voltaire Velazco, Luca Egli, Julian Gröbner, Alberto Redondas, and Wolfgang Steinbrecht

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Short summary
Comparison of total ozone column (TOC) measurements from ground-based Dobson and Brewer spectrophotometers generally reveals seasonally varying differences of a few percent. This study recommends a new TOC retrieval approach, which effectively eliminate these seasonally varying differences by applying new ozone absorption cross-sections, appropriate slit functions for the Dobson instrument, and climatological values for the effective ozone temperature.