Ground-based assessment of the bias and long-term stability of 14 limb and occultation ozone profile data records

Daan Hubert 1 Jean-Christpher Lambert 1 Tiji Verhoelst 1 José Granville 1 Arno Keppens 1 Jean-Luc Baray 2, 3 Adam E. Bourassa 4 Ugo Cortesi 5 Doug A. Degenstein 4 Lucien Froidevaux 6 Sophie Godin-Beekmann 7 Karl W. Hoppel 8 Bryan J. Johnson 9 Erkki Kyrölä 10 Thierry Leblanc 6 Günter Lichtenberg 11 Marion Marchand 7 C. Thomas Mcelroy 12 Donal Murtagh 13 Hideaki Nakane 14, 15 Thierry Portafaix 2 Richard Querel 16 James M. Russell Iii 17 Jacobo Salvador 18 Herman G. J. Smit 19 Kerstin Stebel 20 Wolfgang Steinbrecht 21 Kevin B. Strawbridge 22 René Stübi 23 Daan P. J. Swart 24 Ghassan Taha 25, 26 David W. Tarasick 22 Anne M. Thompson 25 Joachim Urban 13 Joanna A. E. van Gijsel 27 Roeland van Malderen 28 Peter von der Gathen 29 Kaley A. Walker 30, 31 Elian Wolfram 18 Joseph M. Zawodny 32
7 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : The ozone profile records of a large number of limb and occultation satellite instruments are widely used to address several key questions in ozone research. Further progress in some domains depends on a more detailed understanding of these data sets, especially of their long-term stability and their mutual consistency. To this end, we make a systematic assessment of fourteen limb and occultation sounders that, together, provide more than three decades of global ozone profile measurements. In particular, we consider the latest operational Level-2 records by SAGE II, SAGE III, HALOE, UARS MLS, Aura MLS, POAM II, POAM III, OSIRIS, SMR, GOMOS, MIPAS, SCIAMACHY, ACE-FTS and MAESTRO. Central to our work is a harmonized and robust analysis of the comparisons against the ground-based ozonesonde and stratospheric ozone lidar networks. It allows us to investigate, from the ground up to the stratopause, the following main aspects of data quality: long-term stability, overall bias, and short-term variability, together with their dependence on geophysical parameters and profile representation. In addition, it permits us to quantify the overall consistency between the ozone profilers. Generally, we find that between 20–40 km, the satellite ozone measurement biases are smaller than ±5 %, the short-term variabilities are better than 5–12 % and the drifts are at most ±5 % decade−1 (and ±3 % decade−1 for a few records). The agreement with ground-based data degrades somewhat towards the stratopause and especially towards the tropopause, where natural variability and low ozone abundancies impede a more precise analysis. A few records deviate from the preceding general remarks, in part of the stratosphere; we identify biases of 10 % and more (POAM II and SCIAMACHY), markedly higher single-profile variability (SMR and SCIAMACHY), and significant long-term drifts (SCIAMACHY, OSIRIS, HALOE, and possibly GOMOS and SMR as well). Furthermore, we reflect on the repercussions of our findings for the construction, analysis and interpretation of merged data records. Most notably, the discrepancies between several recent ozone profile trend assessments can be mostly explained by instrumental drift. This clearly demonstrates the need for systematic comprehensive multi-instrument comparison analyses.
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Daan Hubert, Jean-Christpher Lambert, Tiji Verhoelst, José Granville, Arno Keppens, et al.. Ground-based assessment of the bias and long-term stability of 14 limb and occultation ozone profile data records. Atmospheric Measurement Techniques, European Geosciences Union, 2016, 9 (6), pp.2497-2534. ⟨10.5194/amt-9-2497-2016⟩. ⟨insu-01175649⟩

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