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The drag exerted by weakly dissipative trapped lee waves on the atmosphere: application to Scorer's two-layer model

2022-04-12Journal article Open access
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dc.contributor.authorTeixeira, Miguel A C
dc.contributor.authorArgain, J.
dc.date.accessioned2023-01-06T15:54:56Z
dc.date.available2023-01-06T15:54:56Z
dc.date.issued2022-04-12
dc.description.abstractAlthough it is known that trapped lee waves propagating at low levels in a stratified atmosphere exert a drag on the mountains that generate them, the distribution of the corresponding reaction force exerted on the atmospheric mean circulation, defined by the wave momentum flux profiles, has not been established, because for inviscid trapped lee waves these profiles oscillate indefinitely downstream. A framework is developed here for the unambiguous calculation of momentum flux profiles produced by trapped lee waves, which circumvents the difficulties plaguing the inviscid trapped lee wave theory. Using linear theory, and taking Scorer's two-layer atmosphere as an example, the waves are assumed to be subject to a small dissipation, expressed as a Rayleigh damping. The resulting wave pattern decays downstream, so the momentum flux profile integrated over the area occupied by the waves converges to a well-defined form. Remarkably, for weak dissipation, this form is independent of the value of Rayleigh damping coefficient, and the inviscid drag, determined in previous studies, is recovered as the momentum flux at the surface. The divergence of this momentum flux profile accounts for the areally integrated drag exerted by the waves on the atmosphere. The application of this framework to this and other types of trapped lee waves potentially enables the development of physically based parametrizations of the effects of trapped lee waves on the atmosphere.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1002/qj.4355pt_PT
dc.identifier.eissn1477-870X
dc.identifier.urihttp://hdl.handle.net/10400.1/18750
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWileypt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGravity wave dragpt_PT
dc.subjectLinear wave theorypt_PT
dc.subjectMountain wavespt_PT
dc.subjectWave momentum fluxpt_PT
dc.subjectWave trappingpt_PT
dc.subjectWeak dissipationpt_PT
dc.titleThe drag exerted by weakly dissipative trapped lee waves on the atmosphere: application to Scorer's two-layer modelpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage3230pt_PT
oaire.citation.issue748pt_PT
oaire.citation.startPage3211pt_PT
oaire.citation.titleQuarterly Journal of the Royal Meteorological Societypt_PT
oaire.citation.volume148pt_PT
person.familyNameTeixeira
person.familyNameArgain
person.givenNameMiguel
person.givenNameJose Luis
person.identifier.ciencia-id6019-5D97-7CFA
person.identifier.ciencia-id0814-FF4B-8E43
person.identifier.orcid0000-0003-1205-3233
person.identifier.orcid0000-0001-9140-0867
person.identifier.ridB-7002-2008
person.identifier.ridM-5296-2013
person.identifier.scopus-author-id9037147000
person.identifier.scopus-author-id11941013900
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication5f0977de-8600-4c6f-9b49-cd21f6163ded
relation.isAuthorOfPublication46a57ed8-c4e0-49e8-84e0-5a03276a34a1
relation.isAuthorOfPublication.latestForDiscovery5f0977de-8600-4c6f-9b49-cd21f6163ded

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