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Shyh-Chin Chen and Kevin E. Trenberth

682JOURNAL OF THE ATMOSPHERIC SCIENCES-OL. 45, NO. 4Forced Planetary Waves in the Northern Hemisphere Winter:Wave-Coupled Orographic and Thermal Forcings $HYH-CHIN CHEN*Department of Atmospheric Sciences, University of Illinois, Urbana, Illinois KEVIN E. TRENBERTHNational Center for dtmospheric Research,** Boulder, Colorado(Manuscript received 25 February 1987, in final form 31 August 1987)ABSTRACT A more complete and new formulation of the oragraphic forcing and new

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V. Hayashi and D. G. Golder

APRIL 1983 Y. HAYASHI AND D. G. GOLDER 941Transient Planetary Waves Simulated by GFDL Spectral General Circulation Models. Part I: Effects of Mountains Y. HAYASHI AND D. G. GOLDER Geophysical Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, NJ 08540 (Manuscript received 20 April 1982, in final form 12 November 1982

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Takeshi Imamura

1. Introduction Planetary-scale free waves whose horizontal structures extend over the whole planet have been observed in the middle atmospheres of the Earth, Mars, and Venus (e.g., Andrews et al. 1987 ; Forbes 2002 ). The vertical momentum transport by such waves is considered to influence the mean flow and has been studied extensively. Latitudinal eddy momentum flux is zero in the classical wave solutions where the background flow is rigid body rotation; however, the occurrence of such

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Shyh-Chin Chen and Kevin E. Trenberth

15NOVEMBER 1985 SHYH-CHIN CHEN AND KEVIN E. TRENBERTH 2415Forced Planetary Waves in a Two-Level Model and Evaluation of the Upper Boundary Condition SHYH-CHIN CHENDepartment of Atmospheric Sciences, University of lllinois, Urbana IL 61801 KEVIN E. TRENBERTHNational Center for Atmospheric Research,* Boulder CO 80307(Manuscript received 13 December 1984, in final form 24 June 1985

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William J. Randel and Rolando R. Garcia

1 M~Y 1994 RANDEL AND GARCIA 1157Application of a Planetary Wave Breaking Parameterization to Stratospheric Circulation Statistics WILLIAM J. RANDEL AND ROLANDO R. G~CtANational Center for Atmospheric Research, * Boulder, Colorado(Manuscript received 18 January 1993, in final form 9 September 1993) The planetary wave parameterization scheme developed recently by Garcia is applied to

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S. Miyahara, Y. Hayashi, and J. D. Mahlman

1844 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL43, NO. 17Interactions between Gravity Waves and Planetary-Scale Flow Simulated by the GFDL "SKYHI" General Circulation Model S. MIYAHARA* Geophysical Fluid Dynamics Program, Princeton University, Princeton, NJ 08542 Y. HAYASHI AND J. D. MAHLMANGeophysical Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, NJ 08542

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J. S. Frederiksen

2320 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUMe36Baroclinic Instability of Zonal Flows and Planetary Waves in Multi-Level Models on a Sphere J. S. FREDERIKSENCSIRO Division of Atmospheric Physics, Asp~ndale, Victoria, Australia(Manuscript received 6 March 1979, in final form 9 July 1979)ABSTRACT A study is made of the changes in growth rates and phase speeds of growing baroclinic

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Marvin A. Geller and Jordan C. Alpert

JUNE 1980 MARVIN A. GELLER AND JORDAN C. ALPERT 1197Planetary Wave Coupling between the Troposphere and the Middle Atmosphere as a Possible Sun-Weather Mechanism MARVIN A. GELLER AND JORDAN C. ALPERTRosensriel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL 33149 (Manuscript received 28 November 1979, in final form 11 February 1980)ABSTRACTThe possibility of planetary wave coupling between the troposphere and solar-induced alterations inthe upper

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F. Sassi, R. R. Garcia, and K. W. Hoppel

analysis products are issued every 6 h on a uniform 1° × 1° global grid at a series of 60 reference pressure levels from the ground to about 100 km, distributed approximately every 2 km in the vertical throughout the middle atmosphere. These gridded analyses form the basis for the present study. Several previous studies have confirmed that the zonal-mean state and planetary wave structures are captured accurately in these NOGAPS-ALPHA analyses at all altitudes, including the newly analyzed upper range

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David M. Straus, Erik Swenson, and Cara-Lyn Lappen

because the two modes have a strong lag correlation. The numerical experiments in both studies were designed to capture the direct response to tropical heating, and so did not take into account the effects of high-frequency transients, and interactions with the evolving synoptic and planetary waves in midlatitudes. In particular, the role of the transients in extracting kinetic energy from the basic flow ( Simmons et al. 1983 ) is ignored. The MJO heating is of course not a single localized source but

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