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Seventeen years of ozone sounding at L'Aquila, Italy: evidence of mid-latitude stratospheric ozone recovery and tropospheric profile changes

Daniele Visioni 1 Giovanni Pitari 2 Vincenzo Rizi 2, 3 Marco Iarlori 2, 3 Irene Cionni 4 Ilaria Quaglia 2 Hideharu Akiyoshi 5 Slimane Bekki 6 Neal Butchart 7 Martin Chipperfield 8 Makoto Deushi 9 Sandip S. Dhomse 8 Rolando Garcia 10 Patrick Joeckel 11 Douglas Kinnison 10 Jean-François Lamarque 10 Marion Marchand 6 Martine Michou 12 Olaf Morgenstern 13 Tatsuya Nagashima 5 Fiona M. O'Connor 7 Luke Oman 14 David Plummer 15 Eugene Rozanov 16 David Saint-Martin 12 Robyn Schofield 17 John Scinocca 15 Andrea Stenke 16 Kane Stone 17 Kengo Sudo 18 Taichu Tanaka 9 Simone Tilmes 10 Holger Tost 11 Yousuke Yamashita 5 Guang Zeng 13
Abstract : Ozone profile measurements collected at L'Aquila (Italy, 42.4°N) during seventeen years of radio-sounding 30 (2000-2016) are presented here, with an analysis of derived trends. Model results from the SPARC-CCMI exercise are used in parallel to highlight the physical and chemical mechanisms regulating mid-latitude ozone trends. The statistically significant trends highlighted in time series at L'Aquila are those in the mid-upper stratosphere (+5.9±4.2), mid troposphere Preprint. Discussion started: 1 July 2020 c Author(s) 2020. CC BY 4.0 License. 2 (+5.9±2.4) and upper troposphere (+2.5±0.9), all in percent/decade. The upper stratospheric positive trend was already well documented in recent WMO assessments and attributed to the starting decline of stratospheric Cly and Bry and to the 35 stratospheric cooling induced by increasing well mixed greenhouse gases, thus slowing down gas-phase reactions that destroy ozone in the upper stratosphere. The ozone increase in the mid-upper troposphere is largely regulated by the increasing strength of the Brewer-Dobson circulation, which moves more ozone from the tropics to the extratropics and enhances the tropospheric influx from the lowermost stratosphere. This climate feedback mechanism on tropospheric ozone is only partially compensated by the increasing chemical ozone loss associated to higher H2O values in response to the 40 tropospheric warming. We also note that ozone trends obtained in the lower stratosphere are negative (-2.2 percent/decade), but do not result to be statistically significant in our analyses.
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Submitted on : Wednesday, July 1, 2020 - 8:32:59 PM
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Daniele Visioni, Giovanni Pitari, Vincenzo Rizi, Marco Iarlori, Irene Cionni, et al.. Seventeen years of ozone sounding at L'Aquila, Italy: evidence of mid-latitude stratospheric ozone recovery and tropospheric profile changes. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2020, pp.(Under Review). ⟨10.5194/acp-2020-525⟩. ⟨insu-02886950⟩



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