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The importance of friction in mountain wave drag amplification by scorer parameter resonance

2012-07Journal article Open Access
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dc.contributor.authorTeixeira, M. A. C.
dc.contributor.authorArgaín, José Luís Almaguer
dc.contributor.authorMiranda, P. M. A.
dc.date.accessioned2018-12-07T14:53:21Z
dc.date.available2018-12-07T14:53:21Z
dc.date.issued2012-07
dc.description.abstractA mechanism for amplification of mountain waves, and their associated drag, by parametric resonance is investigated using linear theory and numerical simulations. This mechanism, which is active when the Scorer parameter oscillates with height, was recently classified by previous authors as intrinsically nonlinear. Here it is shown that, if friction is included in the simplest possible form as a Rayleigh damping, and the solution to the TaylorGoldstein equation is expanded in a power series of the amplitude of the Scorer parameter oscillation, linear theory can replicate the resonant amplification produced by numerical simulations with some accuracy. The drag is significantly altered by resonance in the vicinity of n/l0 = 2, where l0 is the unperturbed value of the Scorer parameter and n is the wave number of its oscillation. Depending on the phase of this oscillation, the drag may be substantially amplified or attenuated relative to its non-resonant value, displaying either single maxima or minima, or double extrema near n/l0 = 2. Both non-hydrostatic effects and friction tend to reduce the magnitude of the drag extrema. However, in exactly inviscid conditions, the single drag maximum and minimum are suppressed. As in the atmosphere friction is often small but non-zero outside the boundary layer, modelling of the drag amplification mechanism addressed here should be quite sensitive to the type of turbulence closure employed in numerical models, or to computational dissipation in nominally inviscid simulations. Copyright (c) 2012 Royal Meteorological Society
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1002/qj.1874
dc.identifier.issn0035-9009
dc.identifier.urihttp://hdl.handle.net/10400.1/11467
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley-Blackwell
dc.relationTurbulent entrainment: physics and large-eddy simulation (LES)
dc.relationStrategic Project - LA 19 - 2011-2012
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSurface friction
dc.subjectStratified flow
dc.subjectLinear criteria
dc.subjectEnhancement
dc.subjectRidge
dc.subjectShear
dc.titleThe importance of friction in mountain wave drag amplification by scorer parameter resonance
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTurbulent entrainment: physics and large-eddy simulation (LES)
oaire.awardTitleStrategic Project - LA 19 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FEME-MFE%2F099636%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FCTE%2FLA0019%2F2011/PT
oaire.citation.endPage1337
oaire.citation.issue666
oaire.citation.startPage1325
oaire.citation.titleQuarterly Journal of the Royal Meteorological Society
oaire.citation.volume138
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameArgain
person.givenNameJose Luis
person.identifier.ciencia-id0814-FF4B-8E43
person.identifier.orcid0000-0001-9140-0867
person.identifier.ridM-5296-2013
person.identifier.scopus-author-id11941013900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscovery46a57ed8-c4e0-49e8-84e0-5a03276a34a1
relation.isProjectOfPublication05fe9dbc-71a0-409a-a13c-f064461504e7
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