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dc.contributor.authorFrancis, X.V.
dc.contributor.authorChemel, C.
dc.contributor.authorSokhi, R.S.
dc.contributor.authorNorton, E.G.
dc.contributor.authorRicketts, H.M.A.
dc.contributor.authorFisher, B.E.A.
dc.date.accessioned2012-12-19T11:29:39Z
dc.date.available2012-12-19T11:29:39Z
dc.date.issued2011-12-01
dc.identifier.citationFrancis , X V , Chemel , C , Sokhi , R S , Norton , E G , Ricketts , H M A & Fisher , B E A 2011 , ' Mechanisms responsible for the build-up of ozone over South East England during the August 2003 heatwave ' , Atmospheric Environment , vol. 45 , no. 38 , pp. 6880-6890 . https://doi.org/10.1016/j.atmosenv.2011.04.035
dc.identifier.issn1352-2310
dc.identifier.otherPURE: 458520
dc.identifier.otherPURE UUID: 3238b265-e9df-4623-8fa8-815a383b8914
dc.identifier.otherScopus: 80755153739
dc.identifier.urihttp://hdl.handle.net/2299/9460
dc.descriptionBased on a Proceedings Paper - 7th Int Conf on Air Quality, Science and Application
dc.description.abstractThe Community Multiscale Air Quality (CMAQ) model is used in order to quantify reasons for the build-up of ozone over South East England during the August 2003 heatwave. Unlike previous studies, the effects of individual meteorological and chemical processes on the temporal evolution of the episode are assessed quantitatively in the present work. The performance of the modelling system was briefly evaluated. The modelling system was able to capture the evolution of the episode, with increasing ozone levels during the period 1-4 August 2003, and maximum values afterwards. Analysis of the results of the CMAQ model indicates that three mechanisms were mainly responsible for the episode: (i) horizontal transport from mainland Europe in the presence of a long-lived high-pressure system, (ii) convergence of westerly and easterly near-surface winds, and (iii) downward entrainment of ozone-rich air from residual layers in the free troposphere. The downward entrainment of ozone from residual layers in the morning is found to be key to enhancing ozone levels during the day. The relevance of this mechanism is supported by the good agreement of the model vertical ozone distribution with that derived from Light detection and ranging (Lidar) measurements. The process analysis of the rate of change of ozone concentration shows that both horizontal transport and vertical transport were equally important in explaining the variability of ozone. The contribution of chemical processes to the increase of ozone concentration as simulated by the modelling system is relatively small close to the surface. However, its contribution to the decrease of ozone concentration there becomes as important as that of meteorological processes. By investigating the role of separate meteorological and chemical mechanisms, this study hopes to add to the current understanding of the evolution of air pollution episode.en
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofAtmospheric Environment
dc.rightsOpen
dc.subjectprocess rate analysis
dc.subjectozone
dc.subjectheatwave
dc.subjectCMAQ
dc.titleMechanisms responsible for the build-up of ozone over South East England during the August 2003 heatwaveen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.contributor.institutionAtmospheric Dynamics & Air Quality
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2011-12-01
rioxxterms.versionVoR
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1016/j.atmosenv.2011.04.035
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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