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https://doi.org/10.5194/acp-2020-525
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-525
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2020

01 Jul 2020

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This preprint is currently under review for the journal ACP.

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

Daniele Visioni1, Giovanni Pitari2, Vincenzo Rizi2,3, Marco Iarlori2,3, Irene Cionni4, Ilaria Quaglia2, Hideharu Akiyoshi5, Slimane Bekki6, Neal Butchart7, Martin Chipperfield8, Makoto Deushi9, Sandip S. Dhomse8, Rolando Garcia10, Patrick Joeckel11, Douglas Kinnison10, Jean-François Lamarque10, Marion Marchand6, Martine Michou12, Olaf Morgenstern13, Tatsuya Nagashima5, Fiona M. O'Connor7, Luke D. Oman15, David Plummer16, Eugene Rozanov17, David Saint-Martin12, Robyn Schofield18, John Scinocca16, Andrea Stenke17, Kane Stone18, Kengo Sudo14, Taichu Y. Tanaka9, Simone Tilmes10, Holger Tost11, Yousuke Yamashita5, and Guang Zeng13 Daniele Visioni et al.
  • 1Cornell University, Sibley School of Mechanical and Aerospace Engineering, Ithaca, NY, USA
  • 2Department of Physical and Chemical Sciences, Università dell’Aquila, L’Aquila, Italy
  • 3CETEMPS, Università dell’Aquila, L’Aquila, Italy
  • 4ENEA, Ente per le Nuove Tecnologie, l’Energia e l’Ambiente, Rome, Italy
  • 5National Institute of Environmental Studies (NIES), Tsukuba, Japan
  • 6LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France
  • 7Met Office Hadley Centre (MOHC), Exeter, UK
  • 8School of Earth and Environment, University of Leeds, Leeds, UK
  • 9Meteorological Research Institute (MRI), Tsukuba, Japan
  • 10National Center for Atmospheric Research (NCAR), Boulder, Colorado, USA
  • 11Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • 12CNRM UMR 3589, Météo-France/CNRS, Toulouse, France
  • 13National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand
  • 14Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
  • 15NASA Goddard Space Flight Center (GSFC), Greenbelt, Maryland, USA
  • 16Environment and Climate Change Canada, Montréal, Canada
  • 17Institute for Atmospheric and Climate Science, ETH Zürich (ETHZ), Zürich, Switzerland
  • 18School of Earth Sciences, University of Melbourne, Melbourne, Victoria, Australia

Abstract. Ozone profile measurements collected at L'Aquila (Italy, 42.4° N) during seventeen years of radio-sounding (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 (+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 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 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.

Daniele Visioni et al.

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Short summary
In this work we analyse the trend in ozone profiles taken at L'Aquila (Italy, 42.4° N) for seventeen years, between 2000 and 2016 and compare them against already available measured ozone trends. We try to understand and explain the observed trends at various heights in light of the simulations from seventeen different model, highlighting the contribution of changes in circulation and chemical ozone loss during this time period.
In this work we analyse the trend in ozone profiles taken at L'Aquila (Italy, 42.4° N) for...
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