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    Frequency of low-ozone events over northwestern Europe in 1952–1963 and 1990–2000

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    Name:
    Br-nnimann_et_al-2003-Geophysi ...
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    Final Published Version
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    Author
    Brönnimann, Stefan
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2003
    
    Metadata
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    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Frequency of low-ozone events over northwestern Europe in 1952–1963 and 1990–2000 2003, 30 (21) Geophysical Research Letters
    Journal
    Geophysical Research Letters
    Rights
    Copyright 2003 by the American Geophysical Union.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The frequency of days with very low total ozone (<225 DU, termed LODs) over northwestern Europe is studied using data from 8 sites from 1952–1963 and 1990–2000. In autumn, the frequency of LODs was similar in both periods. However, in winter, LODs were much more frequent in 1990–2000 than in 1952–1963. The frequency of LODs is a function of both changes in atmospheric dynamics and changes in the mean ozone column. We used a statistical model to address the relative contributions of these two effects. Results show that the changing atmospheric circulation strongly contributed to the increased LOD frequency in winter. The model also suggests a strong effect of a different mean ozone column, but the uncertainty is larger. Because both total ozone and atmospheric dynamics changed little between the two periods in autumn, no large differences in LOD frequency were found during this season.
    Note
    6 month embargo; First published: 12 November 2003
    ISSN
    0094-8276
    DOI
    10.1029/2003GL018431
    Version
    Final published version
    Sponsors
    SB was funded by the Swiss National Science Foundation and the Holderbank-Foundation. LH was supported in part by the NASA Atmospheric Chemistry Modeling and Analysis Program.
    Additional Links
    http://doi.wiley.com/10.1029/2003GL018431
    ae974a485f413a2113503eed53cd6c53
    10.1029/2003GL018431
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