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Dehai Luo and Wenqi Zhang

onset of blocking, indicating that a blocking might serve as the initial trigger for the upward propagation of planetary waves ( O’Neill and Taylor 1979 ; Quiroz 1986 ; Martius et al. 2009 ; Colucci and Kelleher 2015 ). Thus, blocking events are, to some extent, precursors to sudden stratospheric warming (SSW) events ( Martius et al. 2009 ) via increasing upward wave activity pseudomomentum to the stratosphere ( Lubis et al. 2018 ; Nakamura et al. 2020 ). The weak background westerly wind has

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Richard E. Young and Howard Houben

15MAYI989 RICHARD E. YOUNG AND HOWARD HOUBEN 1365Dynamics of Planetary-Scale Baroclinic Waves during Southern Hemisphere Winter RICHARD E. YOUNGSpace Science Division, NASA-Ames Research Center, Moffett Field, California HOWARD HOUBEN Mycol, Inc. Sunnyvale, California (Manuscript received 2 February 1988, in final forrq. 11 November 1988

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Richard S. Lindzen

394 JOURNAL OF THE ATMOSPHERIC SCIENCES Vo~.~J~m27Internal ]Equatorial Planetary-Scale Waves in Shear Flow R~CaAaD S. Lnvoz~Dept. of the Geophydza~ Sciences, The University of Chicago(Manuscript received 19 October 1969)ABSTRACT The theory of internal equatorial planetary-scale waves as developed by Matsuno and by Lindzen isextended to include the effects of shear in the basic state. By means of a

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Robert E. Dickinson

984 JOURNAL OF THE ATMOSPHERIC SCIENCES Vo~.~s~E 25Planetary Rossby Waves Propagating Vertically Through Weak Westerly Wind Wave Guidest ROBERT E. I)ICKI~,'SON~Massachusetts Institute of Technology, Cambridge(Manuscr/pt received 5 December 1967, in revised form 15 May 1968) The role of horizontal wind shears in the vertical propagation of planetary Rossby waves is investigatedusing an

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Kevin E. Trenberth

1126 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUMEdO.Interactions Between Orographically and Thermally Forced Planetary Waves KEVlN E. TRENBERTHDepartment of Atmospheric Sciences, University of lllinois, Urbana, 61801(Manuscript received 2 November 1982, in final form 11 January 1983)ABSTRACT A comprehensive analysis has been made of the atmospheric planetary wave response to orographic

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John H. E. Clark

1430 JOURNAl. OF THE ATMOSPHERIC SCIENCES VoLua~29The Vertical l~ropagation of Forced Atmospheric Planetary Waves Jom~ H. E. C~AxK Atmospheric Science Group, Dept. oJ Civil Engineering, The University of Texas at Austin (Manuscript received 1 September 1971, in revised form 5 September 1972)ABSTRACT Adiabatic, inviscid, quasi-geostrophic perturbations on a t~ plane are forced at some

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Lucy J. Campbell and Theodore G. Shepherd

1. Introduction The quasi-biennial oscillation (QBO) is an oscillation between easterly and westerly zonal winds that is observed in the equatorial stratosphere. It is known to result from momentum transfer via upward-propagating atmospheric waves. Atmospheric general circulation models (GCMs) are able to resolve the planetary-scale equatorial waves (Kelvin waves and mixed Rossby–gravity waves), and the role that these waves play in driving the QBO is well known. In general, GCMs have

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Mark P. Baldwin and James R. Holton

IAPRlL1988 MARK P. BALDWIN AND JAMES R. HOLTON 1123Climatology of the Stratospheric Polar Vortex and Planetary Wave BreakingMARK P. BALDWIN AND JAMES R. HOLTONDepartment of Atmospheric Sciences, University of Washington(Manuscript received 1 May 1987, in final form 22 October 1987)ABSTRACT We use the distribution of Ertel's potential vorticity (PV) on the 850 K isentropic surface to establish aclimatology for

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Murry L. Salby and Rolando R. Garcia

VOL. 44, NO. 19 JOURNAL OF THE ATMOSPHERIC SCIENCES I OCTOBER 1987Vacillations Induced by Interference of Stationary and Traveling Planetary Waves MURRY L. SALBY*Department of Astrophysical, Planetary, and Atmospheric Sciences, University of Colorado, Boulder, CO 80309 ROLANDO R. GARCIA*National Center for Atmospheric Research,** Boulder, CO 80307(Manuscript received 6 October 1986, in final

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Anne K. Smith

1156JOURNAL OF THE ATMOSPHERIC SCIENCESVOL. 53, No. 8Longitudinal Variations in Mesospheric Winds: Evidence for Gravity Wave Filtering by Planetary WavesAtmospheric Chemistry Division, National Center for Atmospheric Research, * Boulder, Colorado (Manuscript received 23 June 1995, in final form 16 October 1995)ABSTRACT Mesospheric horizontal wind data from the High Resolution Doppler Imager (HRDI) satellite instrument areused to investigate the longitudinal variation of nontidal

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