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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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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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Peter Hitchcock, Theodore G. Shepherd, Masakazu Taguchi, Shigeo Yoden, and Shunsuke Noguchi

characterized by the strong suppression of planetary wave propagation into the vortex. Since radiatively driven processes are likely to be much more predictable than the strongly nonlinear wave driving, this suggests at least a proximate reason for the enhanced predictability. The present study, then, is in part motivated by an attempt to better understand the dynamics of these PJO events in the context of a simplified, “mechanistic” circulation model, of the type motivated by Held and Suarez (1994) . Such

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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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M. M. Hurwitz, P. A. Newman, L. D. Oman, and A. M. Molod

et al. 2006 ; Cagnazzo et al. 2009 ). Warming of the Arctic stratosphere is a response to increased planetary wave driving: Garfinkel and Hartmann (2008) showed that the extratropical tropospheric teleconnections produced during El Niño events weaken the Arctic vortex, leading to higher stratospheric temperatures during the NH winter season. The phase of the quasi-biennial oscillation (QBO) ( Garfinkel and Hartmann 2007 ; Bronnimann 2007 ) and volcanic activity ( Randel et al. 2009 ) modulate

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R. M. Samelson

consistently to generate undercurrent flows in the right locations with the right qualitative and quantitative characteristics, is that proposed by McCreary (1981) and subsequently extended by McCreary et al. (1987 , 1992) . In this conception, the undercurrent is viewed as a geostrophic current in a stratified interior-ocean domain in which the dominant dynamics are linear planetary wave propagation, subject perhaps also to the influence of turbulent frictional processes. Motion in the interior domain

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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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Peter D. Killworth, Dudley B. Chelton, and Roland A. de Szoeke

1. Introduction Planetary, or Rossby, waves play a fundamental part in the spinup of the ocean, the maintenance of western boundary layers, and many other features. They owe their existence to variation in the Coriolis parameter, which permits propagation along great-circle waveguides in a westward sense. Unlike rapid coastal Kelvin waves, planetary waves move slowly, at typical speeds of a few centimeters per second. Location of such waves in patchy temperature data required careful attention

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Richard E. Young and Gary L. Villere

I OCTOBER 1985 RICHARD E. YOUNG AND GARY L. VILLERE 1991Nonlinear Forcing of Planetary Scale Waves by Amplifying Unstable Baroclinic Eddies Generated in the TroposphereRICHARD E. YOUNGSpace Science Division, NASA-Ames Research Center, Moffett Field, CA 94035GARY L. VILLEREInformatics Professional Services, Inc., Palo Alto, CA 94303(Manuscript received 25 October 1984, in final form 2 April 1985)ABSTRACT A global

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