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Global analysis of scintillation variance: Indication of gravity wave breaking in the polar winter upper stratosphere

dc.contributor.authorSofieva, V.F.
dc.contributor.authorKyrölä, E.
dc.contributor.authorHassinen, S.
dc.contributor.authorBackman, L.
dc.contributor.authorTamminen, J.
dc.contributor.authorSeppälä, A.
dc.contributor.authorThölix, L.
dc.contributor.authorGurvich, A.S.
dc.contributor.authorKan, V.
dc.contributor.authorDalaudier, F.
dc.contributor.authorHauchecorne, A.
dc.contributor.authorBertaux, J.-L.
dc.contributor.authorFussen, D.
dc.contributor.authorVanhellemont, F.
dc.contributor.authorFanton d'Andon, O.
dc.contributor.authorBarrot, G.
dc.contributor.authorMangin, A.
dc.contributor.authorGuirlet, M.
dc.contributor.authorFehr, T.
dc.contributor.authorSnoeij, P.
dc.contributor.authorSaavedra, L.
dc.contributor.authorKoopman, R.
dc.contributor.authorFraisse, R.
dc.date2007
dc.date.accessioned2016-09-26T12:43:59Z
dc.date.available2016-09-26T12:43:59Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/4372
dc.descriptionStellar scintillations observed through the Earth atmosphere are caused by air density irregularities generated mainly by internal gravity waves and turbulence. We present global analysis of scintillation variance in two seasons of year 2003 based on GOMOS/Envisat fast photometer measurements. Scintillation variance can serve as a qualitative indicator of intensity of small-scale processes in the stratosphere. Strong increase of scintillation variance at high latitudes in winter is observed. The maximum of scintillation variance can be associated with the polar night jet. The simplified spectral analysis has shown the transition of scintillation spectra toward small scales with altitude, which is probably related with turbulence appearing as a result of wave breaking. The breaking of gravity waves in the polar night jet seems to start in the upper stratosphere, a predicted, but not confirmed by observations before, feature. Weaker enhancements in tropics are also observed; they might be related to tropical convection.
dc.languageeng
dc.relation.ispartofseries
dc.titleGlobal analysis of scintillation variance: Indication of gravity wave breaking in the polar winter upper stratosphere
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeAtmospheric optics
dc.subject.freeAtmospheric turbulence
dc.subject.freeGravity waves
dc.subject.freeUpper atmosphere
dc.subject.freeInternal gravity waves
dc.subject.freeStellar scintillations
dc.subject.freeTropical convection
dc.subject.freeGeophysics
dc.subject.freegravity wave
dc.subject.freejet stream
dc.subject.freespectral analysis
dc.subject.freestratosphere
dc.subject.freeturbulence
dc.subject.freewave breaking
dc.source.titleGeophysical Research Letters
dc.source.volume34
dc.source.issue3
dc.source.pageL03812
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2006GL028132
dc.identifier.scopus2-s2.0-34548033956


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