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    Extreme events in total ozone over the Northern mid-latitudes: an analysis based on long-term data setsfrom five European ground-based stations

    Authors
    Rieder, H.E.
    Jancso, L.M.
    Di Rocco, S.
    Staehelin, J.
    Maeder, J.A.
    Mathieu Ribatet, T.P.
    Davison, A.C.
    De Backer, H.
    Koehler, U.
    Krzyścin, J.
    Vaníček, K.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Ozone
    Arosa
    Switserland
    atmosphere
    volcanic eruptions
    Europe
    Audience
    General Public
    Scientific
    Date
    2011
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    We apply methods from extreme value theory to identify extreme events in high (termed EHOs) and low (termed ELOs) total ozone and to describe the distribution tails (i.e. very high and very low values) of five long-term European ground-based total ozone time series. The influence of these extreme events on observed mean values, long-term trends and changes is analysed. The results show a decrease in EHOs and an increase in ELOs during the last decades, and establish that the observed downward trend in column ozone during the 1970–1990s is strongly dominated by changes in the frequency of extreme events. Furthermore, it is shown that clear ‘fingerprints’ of atmospheric dynamics (NAO, ENSO) and chemistry [ozone depleting substances (ODSs), polar vortex ozone loss] can be found in the frequency distribution of ozone extremes, even if no attribution is possible from standard metrics (e.g. annual mean values). The analysis complements earlier analysis for the world's longest total ozone record at Arosa, Switzerland, confirming and revealing the strong influence of atmospheric dynamics on observed ozone changes. The results provide clear evidence that in addition to ODS, volcanic eruptions and strong/moderate ENSO and NAO events had significant influence on column ozone in the European sector.
    Citation
    Rieder, H.E.; Jancso, L.M.; Di Rocco, S.; Staehelin, J.; Maeder, J.A.; Mathieu Ribatet, T.P.; Davison, A.C.; De Backer, H.; Koehler, U.; Krzyścin, J.; Vaníček, K. (2011). Extreme events in total ozone over the Northern mid-latitudes: an analysis based on long-term data setsfrom five European ground-based stations. , Issue Tellus (2011), 63B,, 860–874, IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8905
    Type
    Article
    Peer-Review
    Not pertinent
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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