Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-4649
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dc.contributor.authorAnet, Julien G.-
dc.contributor.authorSteinbacher, Martin-
dc.contributor.authorGallardo, Laura-
dc.contributor.authorVelásquez Álvarez, Patricio A.-
dc.contributor.authorEmmenegger, Lukas-
dc.contributor.authorBuchmann, Brigitte-
dc.date.accessioned2018-08-08T08:26:08Z-
dc.date.available2018-08-08T08:26:08Z-
dc.date.issued2017-
dc.identifier.issn1680-7316de_CH
dc.identifier.issn1680-7324de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/8898-
dc.description.abstractThe knowledge of surface ozone mole fractions and their global distribution is of utmost importance due to the impact of ozone on human health and ecosystems and the central role of ozone in controlling the oxidation capacity of the troposphere. The availability of long-term ozone records is far better in the Northern than in the Southern Hemisphere, and recent analyses of the seven accessible records in the Southern Hemisphere have shown inconclusive trends. Since late 1995, surface ozone is measured in situ at "El Tololo", a high-altitude (2200ma.s.l.) and pristine station in Chile (30°S, 71°W). The dataset has been recently fully quality controlled and reprocessed. This study presents the observed ozone trends and annual cycles and identifies key processes driving these patterns. From 1995 to 2010, an overall positive trend of ∼ 0.7ppb decade−1 is found. Strongest trends per season are observed in March and April. Highest mole fractions are observed in late spring (October) and show a strong correlation with ozone transported from the stratosphere down into the troposphere, as simulated with a model. Over the 20 years of observations, the springtime ozone maximum has shifted to earlier times in the year, which, again, is strongly correlated with a temporal shift in the occurrence of the maximum of simulated stratospheric ozone transport at the site. We conclude that background ozone at El Tololo is mainly driven by stratospheric intrusions rather than photochemical production from anthropogenic and biogenic precursors. The major footprint of the sampled air masses is located over the Pacific Ocean. Therefore, due to the negligible influence of local processes, the ozone record also allows studying the influence of El Niño and La Niña episodes on background ozone levels in South America. In agreement with previous studies, we find that, during La Niña conditions, ozone mole fractions reach higher levels than during El Niño conditions.de_CH
dc.language.isoende_CH
dc.publisherCopernicusde_CH
dc.relation.ispartofAtmospheric Chemistry and Physicsde_CH
dc.rightshttp://creativecommons.org/licenses/by/3.0/de_CH
dc.subject.ddc551: Geologie und Hydrologiede_CH
dc.titleSurface ozone in the Southern Hemisphere : 20 years of data from a site with a unique setting in El Tololo, Chilede_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitZentrum für Aviatik (ZAV)de_CH
dc.identifier.doi10.21256/zhaw-4649-
dc.identifier.doi10.5194/acp-17-6477-2017de_CH
zhaw.funding.euNode_CH
zhaw.issue10de_CH
zhaw.originated.zhawNode_CH
zhaw.pages.end6492de_CH
zhaw.pages.start6477de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume17de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedMeteorology, Environment and Air Traffic (ZAV)de_CH
Appears in collections:Publikationen School of Engineering

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Anet, J. G., Steinbacher, M., Gallardo, L., Velásquez Álvarez, P. A., Emmenegger, L., & Buchmann, B. (2017). Surface ozone in the Southern Hemisphere : 20 years of data from a site with a unique setting in El Tololo, Chile. Atmospheric Chemistry and Physics, 17(10), 6477–6492. https://doi.org/10.21256/zhaw-4649
Anet, J.G. et al. (2017) ‘Surface ozone in the Southern Hemisphere : 20 years of data from a site with a unique setting in El Tololo, Chile’, Atmospheric Chemistry and Physics, 17(10), pp. 6477–6492. Available at: https://doi.org/10.21256/zhaw-4649.
J. G. Anet, M. Steinbacher, L. Gallardo, P. A. Velásquez Álvarez, L. Emmenegger, and B. Buchmann, “Surface ozone in the Southern Hemisphere : 20 years of data from a site with a unique setting in El Tololo, Chile,” Atmospheric Chemistry and Physics, vol. 17, no. 10, pp. 6477–6492, 2017, doi: 10.21256/zhaw-4649.
ANET, Julien G., Martin STEINBACHER, Laura GALLARDO, Patricio A. VELÁSQUEZ ÁLVAREZ, Lukas EMMENEGGER und Brigitte BUCHMANN, 2017. Surface ozone in the Southern Hemisphere : 20 years of data from a site with a unique setting in El Tololo, Chile. Atmospheric Chemistry and Physics. 2017. Bd. 17, Nr. 10, S. 6477–6492. DOI 10.21256/zhaw-4649
Anet, Julien G., Martin Steinbacher, Laura Gallardo, Patricio A. Velásquez Álvarez, Lukas Emmenegger, and Brigitte Buchmann. 2017. “Surface Ozone in the Southern Hemisphere : 20 Years of Data from a Site with a Unique Setting in El Tololo, Chile.” Atmospheric Chemistry and Physics 17 (10): 6477–92. https://doi.org/10.21256/zhaw-4649.
Anet, Julien G., et al. “Surface Ozone in the Southern Hemisphere : 20 Years of Data from a Site with a Unique Setting in El Tololo, Chile.” Atmospheric Chemistry and Physics, vol. 17, no. 10, 2017, pp. 6477–92, https://doi.org/10.21256/zhaw-4649.


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