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dc.contributor.author
Harris, Neil R.P.
dc.contributor.author
Hassler, Birgit
dc.contributor.author
Tummon, Fiona
dc.contributor.author
Bodeker, Greg E.
dc.contributor.author
Hubert, D.
dc.contributor.author
Petropavlovskikh, Irina
dc.contributor.author
Steinbrecht, Wolfgang
dc.contributor.author
Anderson, John
dc.contributor.author
Bhartia, Pawan K.
dc.contributor.author
Boone, C.D.
dc.contributor.author
Bourassa, Adam
dc.contributor.author
Davis, Sean M.
dc.contributor.author
Degenstein, Douglas
dc.contributor.author
Delcloo, Andy
dc.contributor.author
Frith, Stacey M.
dc.contributor.author
Froidevaux, Lucien
dc.contributor.author
Godin-Beekmann, Sophie
dc.contributor.author
Jones, Nicholas
dc.contributor.author
Kuryło, Michael J.
dc.contributor.author
Kyrölä, Erkki
dc.contributor.author
Laine, Marko
dc.contributor.author
Leblanc, S.T.
dc.contributor.author
Lambert, J.-C.
dc.contributor.author
Liley, Ben
dc.contributor.author
Mahieu, Emmanuel
dc.contributor.author
Maycock, Amanda
dc.contributor.author
De Mazière, Martine
dc.contributor.author
Parrish, Alan
dc.contributor.author
Querel, R.
dc.contributor.author
Rosenlof, Karen H.
dc.contributor.author
Roth, Chaggi
dc.contributor.author
Sioris, Christopher
dc.contributor.author
Staehelin, Johannes
dc.contributor.author
Stolarski, Richard S.
dc.contributor.author
Stübi, René
dc.contributor.author
Tamminen, Johanna
dc.contributor.author
Vigouroux, Corinne
dc.contributor.author
Walker, Kaley A.
dc.contributor.author
Wang, H.J.
dc.contributor.author
Wild, Jeannette
dc.contributor.author
Zawodny, Joseph M.
dc.date.accessioned
2018-10-25T12:46:54Z
dc.date.available
2017-06-11T19:20:24Z
dc.date.available
2018-10-25T12:46:54Z
dc.date.issued
2015
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-15-9965-2015
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/104255
dc.identifier.doi
10.3929/ethz-b-000104255
dc.description.abstract
Trends in the vertical distribution of ozone are reported and compared for a number of new and recently revised data sets. The amount of ozone-depleting compounds in the stratosphere (as measured by equivalent effective stratospheric chlorine – EESC) was maximised in the second half of the 1990s. We examine the periods before and after the peak to see if any change in trend is discernible in the ozone record that might be attributable to a change in the EESC trend, though no attribution is attempted. Prior to 1998, trends in the upper stratosphere (~ 45 km, 4 hPa) are found to be −5 to −10 % per decade at mid-latitudes and closer to −5 % per decade in the tropics. No trends are found in the mid-stratosphere (28 km, 30 hPa). Negative trends are seen in the lower stratosphere at mid-latitudes in both hemispheres and in the deep tropics. However, it is hard to be categorical about the trends in the lower stratosphere for three reasons: (i) there are fewer measurements, (ii) the data quality is poorer, and (iii) the measurements in the 1990s are perturbed by aerosols from the Mt Pinatubo eruption in 1991. These findings are similar to those reported previously even though the measurements for the main satellite and ground-based records have been revised. There is no sign of a continued negative trend in the upper stratosphere since 1998: instead there is a hint of an average positive trend of ~ 2 % per decade in mid-latitudes and ~ 3 % per decade in the tropics. The significance of these upward trends is investigated using different assumptions of the independence of the trend estimates found from different data sets. The averaged upward trends are significant if the trends derived from various data sets are assumed to be independent (as in Pawson et al., 2014) but are generally not significant if the trends are not independent. This occurs because many of the underlying measurement records are used in more than one merged data set. At this point it is not possible to say which assumption is best. Including an estimate of the drift of the overall ozone observing system decreases the significance of the trends. The significance will become clearer as (i) more years are added to the observational record, (ii) further improvements are made to the historic ozone record (e.g. through algorithm development), and (iii) the data merging techniques are refined, particularly through a more rigorous treatment of uncertainties.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Past changes in the vertical distribution of ozone - Part 3: Analysis and interpretation of trends
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2015-09-07
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
15
en_US
ethz.journal.issue
17
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
9965
en_US
ethz.pages.end
9982
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03517 - Peter, Thomas / Peter, Thomas
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03517 - Peter, Thomas / Peter, Thomas
ethz.date.deposited
2017-06-11T19:20:32Z
ethz.source
ECIT
ethz.identifier.importid
imp5936537a11e9134799
ethz.ecitpid
pub:163093
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-08-01T16:48:18Z
ethz.rosetta.lastUpdated
2018-10-25T12:46:57Z
ethz.rosetta.versionExported
true
ethz.COinS
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