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dc.contributor.authorQuimbayo-Duarte, Julian
dc.contributor.authorStaquet, Chantal
dc.contributor.authorChemel, Charles
dc.contributor.authorArduini, Gabriele
dc.date.accessioned2019-04-25T14:00:30Z
dc.date.available2019-04-25T14:00:30Z
dc.date.issued2019-08-01
dc.identifier.citationQuimbayo-Duarte , J , Staquet , C , Chemel , C & Arduini , G 2019 , ' Dispersion of tracers in the stable atmosphere of a valley opening onto a plain ' , Boundary-Layer Meteorology , vol. 172 , no. 2 , pp. 291-315 . https://doi.org/10.1007/s10546-019-00439-2
dc.identifier.issn0006-8314
dc.identifier.otherPURE: 16640990
dc.identifier.otherPURE UUID: 9a12634b-1e7e-4d32-adf4-aa8feee86fa2
dc.identifier.otherScopus: 85064437820
dc.identifier.urihttp://hdl.handle.net/2299/21299
dc.description© Springer Nature B.V. 2019
dc.description.abstractWe quantify the impact of a valley-wind system on the transport of passive tracers in the stably-stratified atmosphere of a valley dynamically decoupled from the atmosphere above. The simple configuration of an idealized Alpine-type valley opening onto a plain is considered, for two values of the initial buoyancy frequency and of the valley steepness. The valley-wind system consists of thermally-driven downslope flows that induce a pressure difference between the valley interior and the plain, thereby triggering a down-valley flow. A steady-state regime is eventually reached, at the beginning of which passive tracers are emitted at the valley floor and at different heights above it. The tracer emitted at the valley floor is fully mixed below the height of the maximum speed of the down-valley flow, which behaves like a jet, and remains decoupled from the tracers emitted above. The down-valley flow increases linearly in the along-valley direction y so that, from the conservation of tracer flux, the tracer concentration decays as 1/y. A simple theoretical model is proposed to fully account for the down-valley flow and tracer behaviour. The tracer concentration emitted at the valley floor also displays marked oscillations, induced by internal gravity waves radiated via a hydraulic-jump process when the downslope flow reaches the valley floor. The amplitude of the oscillations can be as high as 50% of their mean value, implying that averaged values in an urbanized valley may disguise high instantaneous—and potentially harmful-values.en
dc.format.extent25
dc.language.isoeng
dc.relation.ispartofBoundary-Layer Meteorology
dc.rightsEmbargoed
dc.subjectIdealized Alpine valley
dc.subjectNumerical modelling
dc.subjectPassive tracer transport
dc.subjectStable conditions
dc.subjectValley-wind system
dc.subjectAtmospheric Science
dc.titleDispersion of tracers in the stable atmosphere of a valley opening onto a plainen
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.contributor.institutionAtmospheric Dynamics & Air Quality
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.date.embargoedUntil2020-04-04
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85064437820&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2019-08-01
rioxxterms.versionAM
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1007/s10546-019-00439-2
rioxxterms.licenseref.uriOther
rioxxterms.licenseref.startdate2020-04-04
rioxxterms.typeJournal Article/Review
herts.date.embargo2020-04-04
herts.rights.accesstypeEmbargoed


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