Preprints
https://doi.org/10.5194/acp-2020-1121
https://doi.org/10.5194/acp-2020-1121

  17 Feb 2021

17 Feb 2021

Review status: a revised version of this preprint is currently under review for the journal ACP.

Observation and modeling of high-7Be events in Northern Europe associated with the instability of the Arctic polar vortex in early 2003

Erika Brattich1, Hongyu Liu2, Bo Zhang2, Miguel Ángel Hernández-Ceballos3, Jussi Paatero4, Darko Sarvan5, Vladimir Djurdjevic6, Laura Tositti7, and Jelena Ajtić5 Erika Brattich et al.
  • 1Department of Physics and Astronomy DIFA, Alma Mater Studiorum University of Bologna, via Irnerio 46, 40126 Bologna (BO), Italy
  • 2National Institute of Aerospace, 100 Exploration Way, Hampton, VA 23666, USA
  • 3Department of Physics, University of Cordoba, Rabanales Campus, 14071 Cordoba, Spain
  • 4Finnish Meteorological Institute, P.O. Box 503, FI-00101, Helsinki, Finland
  • 5Faculty of Veterinary Medicine, University of Belgrade, Bulevar oslobođenja 18, 11000 Belgrade, Serbia
  • 6Institute of Meteorology, Faculty of Physics, University of Belgrade, Studentski trg 18, 11000 Belgrade, Serbia
  • 7Department of Chemistry “G. Ciamician”, Alma Mater Studiorum University of Bologna, via Selmi 2, 40126 Bologna (BO), Italy

Abstract. Events of very high concentrations of 7Be cosmogenic radionuclide have been recorded in the subpolar regions of Europe during the cold season. With an aim to investigate the mechanisms responsible for those peak 7Be events, and in particular to verify if they are associated with the fast descent of stratospheric air masses occurring during sudden stratospheric warming (SSWs), we analyse 7Be observations at six sampling sites in Scandinavia during January–March 2003 when very high 7Be concentrations were observed and the Arctic vortex was relatively unstable as a consequence of several SSWs. We use the GEOS-Chem chemistry and transport model driven by the MERRA-2 meteorological reanalysis to simulate tropospheric 7Be over Northern Europe. We show that the model reasonably reproduces the temporal evolution of surface 7Be concentrations observed at the six sampling sites. Our analysis of model simulations, surface 7Be observations, as well as atmospheric soundings of ozone and temperature indicates that the 7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Scandinavia was associated with downward transport of stratospheric vortex air originated during SSW that occurred a few days before the peak (18–21 February 2003).

Erika Brattich et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2020-1121', Anonymous Referee #2, 03 Mar 2021
    • AC1: 'Reply on RC1', Erika Brattich, 10 Jun 2021
  • RC2: 'Comment on acp-2020-1121', Anonymous Referee #3, 19 Mar 2021
    • AC2: 'Reply on RC2', Erika Brattich, 10 Jun 2021

Erika Brattich et al.

Data sets

Observation and modeling of high-7Be events in Northern Europe associated with the instability of the Arctic polar vortex in early 2003 Brattich, Erika; Liu, Hongyu; Zhang, Bo; Hernández-Ceballos, Miguel Angel; Paatero, Jussi; Sarvan, Darko; Djurdjevic, Vladimir; Tositti, Laura; Ajtić, Jelena https://doi.org/10.5281/zenodo.4117521

Erika Brattich et al.

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Short summary
In this study we analyse the output of a chemistry and transport model together with observations of different meteorological and compositional variables to demonstrate the link between sudden stratospheric warming and transport of stratospheric air to the surface in the subpolar regions of Europe during the cold season. Our findings have particular implications for atmospheric composition since climate projections indicate more frequent sudden stratospheric warming under a warmer climate.
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