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000001723 0247_ $$2DOI$$a10.1029/2008JD010518
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000001723 0247_ $$2ISSN$$a0148-0227
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000001723 041__ $$aeng
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000001723 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000001723 1001_ $$0P:(DE-HGF)0$$aPunge, H.J.$$b0
000001723 245__ $$aEffects of the quasi-biennial oscillation on low-latitude transport in the stratosphere as derived from model driven trajectory calculations
000001723 260__ $$aWashington, DC$$aWashington, DC$$bUnion$$bUnion$$c2009
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000001723 440_0 $$03369$$aJournal of Geophysical Research$$v114$$x0022-1406
000001723 500__ $$aThis work was supported by the European Commission within the 6th Framework Integrated Project SCOUT-O3. The authors greatly acknowledge the technical support given by Nicole Thomas and valuable comments by Gebhard Gunther.
000001723 520__ $$aThe quasi-biennial oscillation (QBO) of stratospheric zonal winds induces a secondary meridional circulation (SMC) consisting of QBO variations in meridional and vertical winds. In this work, we investigate how these instantaneous meridional circulation anomalies add over time to variations of stratospheric transport. To that end, we compute backward parcel trajectories on the basis of the output of a chemistry-climate model (CCM). At the equator, the trajectories show the strongest vertical parcel displacement over a seasonal timescale when the QBO progresses toward easterly phase in the middle stratosphere. During the solstitial seasons a large number of parcels come from the summer hemisphere, causing in addition a QBO variation in the spread of the total ascent among equatorial parcels. A QBO effect on meridional transport is diagnosed from PV gradients during summer in the easterly phase of the QBO, which suggests a variation of the tropical-subtropical barrier strength. Analyses of the parcel trajectories and CCM trace gas distributions confirm this finding. We suggest that this variation is due to the combined effects of QBO and annual variation in meridional advection and in wave-induced eddy transport.
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000001723 7001_ $$0P:(DE-Juel1)129130$$aKonopka, P.$$b1$$uFZJ
000001723 7001_ $$0P:(DE-HGF)0$$aGiorgetta, M.A.$$b2
000001723 7001_ $$0P:(DE-Juel1)129138$$aMüller, R.$$b3$$uFZJ
000001723 773__ $$0PERI:(DE-600)2016800-7$$a10.1029/2008JD010518$$gVol. 114, p. D03102$$pD03102$$q114<D03102$$tJournal of geophysical research / Atmospheres$$v114$$x0022-1406$$y2009
000001723 8567_ $$uhttp://dx.doi.org/10.1029/2008JD010518
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