Frequency of low-ozone events over northwestern Europe in 1952–1963 and 1990–2000
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationFrequency of low-ozone events over northwestern Europe in 1952–1963 and 1990–2000 2003, 30 (21) Geophysical Research Letters
JournalGeophysical Research Letters
RightsCopyright 2003 by the American Geophysical Union.
Collection InformationThis 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 firstname.lastname@example.org.
AbstractThe 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.
Note6 month embargo; First published: 12 November 2003
VersionFinal published version
SponsorsSB 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.