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E. Tyrlis and B. J. Hoskins

eastern Atlantic and Europe, anticyclonic wave breaking occurs ( Figs. 4c,d ) resulting in a blocking anticyclone through amplification of the ambient planetary ridge ( Fig. 2a ). The polar air advected equatorward and westward in the wave breaking can lead to a cutoff low to the south. Another picture of this evolution is given by Fig. 5 , which presents the evolution in terms of the anomalies in θ on the 2-PVU surface for the same set of days. Four days before onset ( Fig. 5a ) it is seen that

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John Fyfe and Jacques Derome

2162 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 43, No. 20A Barotropic Stability Study of Free and Forced Planetary Waves* JOHN FYFE AND JACQUES DEROMEDepartment of Meteorology, McGill University, Montreal, Quebec, Canada 1t5,4 2K6(Manuscript received 3 September 1985, in final form 14 April 1986)ABSTRACT The stability of free and forced planetary waves in a B-plane channel is investigated with a barotropic

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Y. T. Chiu and J. M. Straus

Ma-1974 Y.T. CHIU AND J. M. STRAUS 1109The Structure of Planetary Waves in the Auroral Region Upper Atmosphere~ Y. T. Catu ^t~r) J. M. STItAUSSpace Physics Laboratory, The Aerospace Corporation, El Segundo, Calif. 90245(Manuscript received 26 September 1973, in revised form 30 January 1974)ABSTRACT Invoking recent satellite observations of the planetary-scale variations of auroral

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Byeong-Gwon Song, Hye-Yeong Chun, and In-Sun Song

Polvani 2007 ; Butler et al. 2017 ). These two types of SSWs have distinct characteristics in planetary waves (PWs) and gravity waves (GWs), as well as the mean wind and temperature ( Albers and Birner 2014 ; Song and Chun 2016 ). More rapid warming and more abrupt breaking of the polar vortex in the stratosphere are observed for vortex-split SSWs ( Charlton and Polvani 2007 ; Harada et al. 2010 ; Bancalá et al. 2012 ; Song and Chun 2016 ; Butler et al. 2017 ). Among the various vortex

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Richard E. Young

15 DECEMBER 1986 RICHARD E. YOUNG 3241Effects of Eddy Initial Conditions on Nonlinear Forcing of Planetary Scale Waves by Amplifying Baroclinic Eddies RICHARD E. YOUNGSpace Science Division, NASA-Ames Research Center, Moffett Field, CA 94035(Manuscript received 10 March 1986, in final form 11 August 1986)ABSTRACT The previous study of Young and Villere

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Adam Hugh Monahan and Lionel Pandolfo

1. Introduction Since the early work of Hoskins and Karoly (1981) , a substantial amount of research has been directed toward understanding the dynamics of planetary waves in a spherical atmosphere. This subject has attracted interest because of the possible role of these global-scale waves in mediating observed atmospheric teleconnections, suggesting the possibility of a theory of large-scale, low-frequency variability in which the planetary waves play the role of fundamental dynamical

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G. A. Jones and S. K. Avery

circulation and planetary-wave winds on the'distribution of nitric oxide inthe 55-120 kra height region is investigated. A time-dependent numerical model is used to investigate theinteraction between l~lanetary waves and the zonal mean circulation, and the effect of the circulation on thenitric oxide distribution is determined. The initial nitric oxide NO) distribution is obtained by using a simplesource/sink chemistry, vertical eddy diffusion, and advective transport by the zonal mean circulation

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R. K. Scott and P. H. Haynes

of a wave-driven mean flow with relaxation to a basic state. The quasi-geostrophic shallow-water equations in a β channel, with only one meridional and one zonal Fourier mode, reduce under quasi-static assumptions to where u is the zonal mean zonal velocity, u r is some radiative basic-state velocity, α is the relaxation rate, and D ( u ; h b ) is the steady-state wave drag associated with a particular u and planetary wave boundary forcing h b ( Charney and DeVore 1979 ; Held 1983

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Masaru Yamamoto

traveling equatorial waves are important in the redistribution of angular momentum. Covey and Schubert (1981a , 1982) and Smith et al. (1992 , 1993) examined linear responses of planetary-scale waves in the Venus atmosphere, and pointed out that the global-scale UV oscillations with the 4-day period are associated with the resonant waves. In the case that resonant wave has the critical level near the low-stability layer (∼55 km) where buoyancy frequency ( N ) is very low, the nonlinear effects of

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D. G. Andrews and M. F. McIntyre

NOVEMBER 1976 D. G. A N D R E W S A N D M. E. M c I N T Y R E 2049Planetary Waves in Horizontal and Vertical Shear: Asymptotic Theory for Equatorial Waves in Weak Shear D. G. A~)~ws AND M. E. MclN~r~U. K. Universities' Atmospheri~ Modelling Group, Department of Geophysics, University of Reading and Department of Applied Mall~ematics and Theoretical Physics, University of Cambridge

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