000004717 001__ 4717
000004717 005__ 20240712100910.0
000004717 0247_ $$2WOS$$aWOS:000267324700009
000004717 0247_ $$2Handle$$a2128/10166
000004717 037__ $$aPreJuSER-4717
000004717 041__ $$aeng
000004717 082__ $$a550
000004717 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000004717 1001_ $$0P:(DE-Juel1)VDB13497$$aErn, M.$$b0$$uFZJ
000004717 245__ $$aWave fluxes of equatorial Kelvin waves andQBO zonal wind forcing derived from SABER and ECMWF temperature space-time spectra
000004717 260__ $$aKatlenburg-Lindau$$bEGU$$c2009
000004717 300__ $$a3957 - 3986
000004717 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
000004717 3367_ $$2DataCite$$aOutput Types/Journal article
000004717 3367_ $$00$$2EndNote$$aJournal Article
000004717 3367_ $$2BibTeX$$aARTICLE
000004717 3367_ $$2ORCID$$aJOURNAL_ARTICLE
000004717 3367_ $$2DRIVER$$aarticle
000004717 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v9$$x1680-7316
000004717 500__ $$aThe work of M. Ern was supported by the European Commission (European Union's 6th framework program) within the EC Integrated Project SCOUT-O3 (505390-GOCE-CT-2004). We thank the whole SABER team, in particular M. G. Mlynczak, J. M. Russell III, and L. L. Gordley for providing the excellent data set of SABER temperatures. Thanks also go to the European Centre for Medium-Range Weather Forecasts (ECMWF) for providing the ECMWF operational analyses used. Helpful comments by two anonymous reviewers are acknowledged.
000004717 520__ $$aThe quasi-biennial oscillation (QBO) of the zonal mean zonal wind is a dynamical phenomenon of the tropical middle atmosphere. Influences of the QBO can even be found at mid and high latitudes. It is widely accepted that the phase descent of alternating tropical easterlies and westerlies is driven by atmospheric waves of both global scale (equatorial wave modes like Kelvin, equatorial Rossby, Rossby-gravity, or inertia-gravity waves), as well as mesoscale gravity waves. However, the relative distribution of the different types of waves to the forcing of the QBO winds is highly uncertain. This is the case because until recently there were no high resolution long-term global measurements in the stratosphere. In our study we estimate Kelvin wave momentum flux and the contribution of zonal wind forcing by Kelvin waves based on space-time spectra determined from both Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature measurements as well as temperatures from European Centre for Medium-Range Weather Forecasts (ECMWF) operational analyses. Peak values of total Kelvin wave zonal wind forcing found are about 0.2 m/s/day. There is good agreement between SABER and ECMWF results. Altitude-time cross sections are shown and the results are compared to the total wave forcing required to balance the background atmosphere. Sometimes Kelvin wave forcing is sufficient to explain almost the whole total wave forcing required for the momentum balance during the transition from QBO easterly to westerly winds. This is especially the case during the periods of strong westerly wind shear when the zonal wind is between -20 and 10 m/s at the equator in the altitude range 20 to 35 km. During other parts of the phases of strong westerly wind shear, however, the contribution of Kelvin waves can be comparably low and the missing wave forcing, which is often attributed to mesoscale gravity waves or intermediate scale waves, can be the by far dominant contribution of the QBO forcing. It is also found that seasonal variations of Kelvin wave accelerations could play an important role for the maintenance of the QBO westerly wind jets in the lower stratosphere.
000004717 536__ $$0G:(DE-Juel1)FUEK406$$2G:(DE-HGF)$$aAtmosphäre und Klima$$cP22$$x0
000004717 588__ $$aDataset connected to Web of Science
000004717 650_7 $$2WoSType$$aJ
000004717 7001_ $$0P:(DE-Juel1)VDB12001$$aPreusse, P.$$b1$$uFZJ
000004717 773__ $$0PERI:(DE-600)2069847-1$$gVol. 9, p. 3957 - 3986$$p3957 - 3986$$q9<3957 - 3986$$tAtmospheric chemistry and physics$$v9$$x1680-7316$$y2009
000004717 8564_ $$uhttps://juser.fz-juelich.de/record/4717/files/acp-9-3957-2009.pdf$$yOpenAccess
000004717 8564_ $$uhttps://juser.fz-juelich.de/record/4717/files/acp-9-3957-2009.gif?subformat=icon$$xicon$$yOpenAccess
000004717 8564_ $$uhttps://juser.fz-juelich.de/record/4717/files/acp-9-3957-2009.jpg?subformat=icon-180$$xicon-180$$yOpenAccess
000004717 8564_ $$uhttps://juser.fz-juelich.de/record/4717/files/acp-9-3957-2009.jpg?subformat=icon-700$$xicon-700$$yOpenAccess
000004717 8564_ $$uhttps://juser.fz-juelich.de/record/4717/files/acp-9-3957-2009.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000004717 909CO $$ooai:juser.fz-juelich.de:4717$$pdnbdelivery$$pVDB$$pdriver$$popen_access$$popenaire
000004717 9141_ $$y2009
000004717 915__ $$0LIC:(DE-HGF)CCBY3$$2HGFVOC$$aCreative Commons Attribution CC BY 3.0
000004717 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
000004717 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
000004717 9131_ $$0G:(DE-Juel1)FUEK406$$aDE-HGF$$bUmwelt$$kP22$$lAtmosphäre und Klima$$vAtmosphäre und Klima$$x0$$zfortgesetzt als P23
000004717 9201_ $$0I:(DE-Juel1)VDB790$$d30.09.2010$$gICG$$kICG-1$$lStratosphäre$$x1
000004717 970__ $$aVDB:(DE-Juel1)111917
000004717 9801_ $$aUNRESTRICTED
000004717 9801_ $$aFullTexts
000004717 980__ $$aVDB
000004717 980__ $$aConvertedRecord
000004717 980__ $$ajournal
000004717 980__ $$aI:(DE-Juel1)IEK-7-20101013
000004717 980__ $$aUNRESTRICTED
000004717 981__ $$aI:(DE-Juel1)ICE-4-20101013
000004717 981__ $$aI:(DE-Juel1)IEK-7-20101013