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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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John R. Albers, George N. Kiladis, Thomas Birner, and Juliana Dias

–tropical teleconnection pattern and are part of a subclass of planetary waveguides discussed in previous studies (e.g., Hoskins and Ambrizzi 1993 ). As Rossby waves propagate along the Pacific and Atlantic waveguides, they eventually grow in amplitude and break ( Scott and Cammas 2002 ; Abatzoglou and Magnusdottir 2006 ; Hitchman and Huesmann 2007 ). As the waves break, large intrusions of high-PV air extend equatorward and downward from the lower stratosphere into the upper troposphere, while low-PV tropospheric

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C. McLandress and N. A. McFarlane

1966 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 50, No. 13Interactions between Orographic Gravity Wave Drag and Forced Stationary Planetary Waves in the Winter Northern Hemisphere Middle Atmosphere C. Mc LANDRESSInstitute for Space and Terrestrial Science, North York, Ontario, Canada N. A. MCFARLANECanadian Climate Centre, Downsview, Ontario, Canada(Manuscript received 2 December

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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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Mark R. Schoeberl

630 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUM-3The Secondary Flow near a Baroclinic Planetary Wave Critical Line MARK R. SCHOEBERLGeophysical and Plasma Dynamics Branch, Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375(Manuscript received 13 March 1980, in final form 18 November 1980) ABSTRACT The wave-mean flow interaction has

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Gudrun Magnusdottir and Peter H. Haynes

not reach as far in Fig. 15a as in Fig. 14c . If instead of Fig. 14c , we look at the same field generated from the same simulation of forcing amplitude 0.9, 6 days earlier, or on day 20 shown in Fig. 15b , the wave train looks almost the same as in Fig. 15a , for forcing amplitude 0.6 on day 26. Other forcing amplitudes were also considered and they support the conclusion that given enough forcing, planetary waves will be reflected out of the low-latitude wave-breaking region. The greater

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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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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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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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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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