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dc.contributor.author
Tarasova, Oksana A.
dc.contributor.author
Senik, Irina A.
dc.contributor.author
Sosonkin, Myhailo G.
dc.contributor.author
Cui, J.
dc.contributor.author
Staehelin, Johannes
dc.contributor.author
Prévôt, André S.H.
dc.date.accessioned
2018-09-25T15:38:05Z
dc.date.available
2017-06-14T12:00:10Z
dc.date.available
2018-09-25T15:38:05Z
dc.date.issued
2009
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-9-4157-2009
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/157212
dc.identifier.doi
10.3929/ethz-b-000157212
dc.description.abstract
Long-term ozone measurements of two background mountain sites, namely the Kislovodsk High Mountain Station in Caucasus, Russia (KHMS, 43.70° N, 42.70° E, 2070 m a.s.l.) and the Jungfraujoch in Switzerland (JFJ, 46.55° N, 7.98° E, 3580 m a.s.l.) are compared. Despite of more than 1.5 km altitude difference ozone mixing ratios are comparable at JFJ an KHMS in the beginning of measurements (1990–1993) while the annually averaged levels at JFJ are around 15 ppb higher than the ones at KHMS for the most recent years (1997–2006). The seasonal cycle of the surface ozone mixing ratios is characterized by a double spring-summer maximum at both sites with a spring one being more pronounced for the air masses with the longest contact with the upper free troposphere and stratosphere. Ozone mixing ratio increased at JFJ but decreased at KHMS for the period 1990–2006. Trends are more pronounced for the 1990s (+0.73±0.20 ppb/year at JFJ and −0.91±0.17 ppb/year at KHMS for the period 1991–2001) in comparison with the later years (+0.04±0.21 ppb/year at JFJ and −0.37±0.14 ppb/year at KHMS for the period 1997–2006). Trends show a distinct seasonality, which is different for the different periods. To investigate possible reasons for this remarkable trends difference 3-D trajectories using LAGRANTO trajectory model are used. Effects of horizontal and vertical transport on ozone trends are considered. No substantial systematic changes in the transport patterns were detected which could lead to strong changes in the trend magnitude between 1991–2001 and 1997–2006. The geographical position of the sites relative to the main topographic features and emission sources as well as distance from the coast are interpreted to be among the main reasons for the opposite surface ozone trends. During the 90s the JFJ trend reflects increase of the ozone in the upper free troposphere/lower stratosphere, while KHMS is not sensitive to this change or even showing the opposite tendency. The analysis provided evidence for a stronger influence of processes in the lower troposphere, in particular the dramatic emission decrease in the earlier 1990s in former USSR and emissions regulations in Western Europe on the surface ozone trend at KHMS.
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
Surface ozone at the Caucasian site Kislovodsk High Mountain Station and the Swiss Alpine site Jungfaujoch: data analysis and trends (1990–2006)
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2009-06-23
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
9
en_US
ethz.journal.issue
12
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
4157
en_US
ethz.pages.end
4175
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-14T12:06:30Z
ethz.source
ECIT
ethz.identifier.importid
imp59364ce32e5b310601
ethz.ecitpid
pub:35512
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-14T17:54:41Z
ethz.rosetta.lastUpdated
2018-09-25T15:38:13Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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