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Hye-Yeong Chun, Young-Ha Kim, Hyun-Joo Choi, and Jung-Yoon Kim

planetary and gravity waves ( Holton et al. 1995 ), and its annual cycle could be related to the annual cycle of planetary-wave forcing. However, Plumb and Eluszkiewicz (1999) showed from their numerical simulations that the extratropical wave forcing is not sufficient to drive upwelling near the equator and that wave drag within 20° of the equator is required. They suggested that vertically propagating equatorial planetary and/or gravity waves may contribute to the angular momentum budget in the

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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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Chaim I. Garfinkel, Tiffany A. Shaw, Dennis L. Hartmann, and Darryn W. Waugh

propagation of planetary waves in the stratosphere. In the rest of this paper, we refer to the mechanism presented in Holton and Tan (1980) involving the subtropical critical line as the HT mechanism. Holton and Tan (1980) were unable to find any clear differences in the Eliassen–Palm flux (EPF) between the easterly and westerly phases of the QBO, however. Although more recent studies do find a robust change in EPF due to the QBO ( Garfinkel and Hartmann 2008 ; Yamashita et al. 2011 ), a change in

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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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Bo Christiansen

) found a convincing bimodality in the distribution of anomaly correlations of the stratospheric zonal mean wind. We will comment on the latter result in the discussion. An early and much cited observation of bimodality in the extratropical atmospheric variability was presented in papers by Hansen and Sutera ( Sutera 1986 ; Hansen 1986 ; Hansen and Sutera 1986 ), who studied a planetary-scale atmospheric wave amplitude index (WAI). It is a particular strength of these studies that they are based on

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Josef Schäfer

Ju~1979 NOTES AND CORRESPONDENCE 1117NOTES AND COrrESPONDENCEA Space-Time Analysis of Tropospheric Planetary Waves in the Northern Hemisphere Jos~.rRadioastronomical Institute, University of Bonn, Bonn, West Germany 15 September 1978 and 13 February 1979ABSTRACT The propagation of planetary waves at the 500 mb level is investigated by applying an

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William J. Randel, Byron A. Boville, and John C. Gille

3092 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 47, NO. 24Observations of Planetary Mixed Rossby-Gravity Waves in the Upper StratosphereWILLIAM J. RANDEL, BYRON,A. BOVILLE AND JOHN C. GILLENational Center for Atmospheric Research, * Boulder, Colorado(Manuscript received 10 February 1990, in final form I August 1990) ABSTRACT Observational evidence is presented for planetary scale (zonal wave number

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