Observation and modeling of high-<sup>7</sup>Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003
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Published:2021-12-07
Issue:23
Volume:21
Page:17927-17951
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Brattich ErikaORCID, Liu HongyuORCID, Zhang BoORCID, Hernández-Ceballos Miguel Ángel, Paatero Jussi, Sarvan Darko, Djurdjevic VladimirORCID, Tositti LauraORCID, Ajtić JelenaORCID
Abstract
Abstract. Events of very high concentrations of 7Be cosmogenic
radionuclide have been recorded at low-elevation surface stations 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
(SSW) events, we analyze 7Be observations at six sampling sites in
Fennoscandia during January–March 2003 when very high 7Be
concentrations were observed and the Arctic vortex was relatively unstable
as a consequence of several SSW events. 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, atmospheric soundings of ozone
and temperature and surface ozone measurements indicates that the
7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Fennoscandia was associated with downward
transport of stratospheric vortex air that originated during an SSW that occurred
a few days earlier (between 18 and 21 February 2003).
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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