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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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William H. Hooke and R. Michael Jones

2048JOURNAL OF THE ATMOSPHERIC SCIENCESVOL. 43, No. 19Dissipative Waves Excited by Gravity-Wave Encounterswith the Stably Stratified Planetary Boundary Layer WILLIAM H. HWKE AND R. MICHAEL JONESEnvironmental Research Laboratories, National Oceanic and Atmospheric Administration. Boulder, CO 80303 (Manuscript received 19 September 1985, in final form 2 April 1986) ABSTRACTWe suggest that the strata of strong echo returns frequently revealed by remote

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Robert J. Kurzeja

?D-C-MB-a 1981 R O B E R T J. K U R Z E J A 2779The Transport of Trace Chemicals by Planetary Waves in the Stratosphere. .Part 1: Steady Waves ROBERT J. KURZEJA Joint Institute for Advancement.of Flight Sciences, The George Washington University, NASA-Langley Research Center, Hampton, VA 23665 (Manuscript received 30 March, 1981, in final form 28 July

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Mark R. Schoeberl

SEPTEMBER 1981 M A R K R. S C H O E B E R L 1841A Simple Modem of the Lagrangian~Mean Flow Produced by Dissipating Planetary Waves MARK R. SCHOEBERLNaval Research Laboratory, Washington, DC 20375(Manuscript received 6 August 1980, in final form 29 April 1981)ABSTRACT A simple equation for the Lagrangian-mean flow induced by damped planetary waves is derived. Theflow computed for stationary planetary

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Gang Chen and Lantao Sun

BDC may be driven by nonlinear thermally driven circulations, analogous to tropospheric Hadley cell circulations, and this appears to be particularly important for the tropical upwelling in the summer hemisphere or in the upper stratosphere ( Dunkerton 1989 ; Semeniuk and Shepherd 2001a , b ; Tung and Kinnersley 2001 ; Zhou et al. 2006 ). More importantly, wave drag (i.e., planetary-scale, synoptic-scale, or gravity wave drag) can contribute to the forcing of the BDC through the downward

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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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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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Anthony R. Hansen and Alfonso Sutera

1 JuLY 1995 HANSEN AND SUTERA 2463The Probability Density Distribution of the Planetary-Scale Atmospheric Wave Amplitude Revisited ANTHONY R. HANSENCenter for Atmospheric and Space Sciences, Augsburg College, Minneapolis, Minnesota ALFONSO S UTERADepartment of Mathematics and Physics, University of Camerino, Camerino, Italy(Manuscript received 22 April 1994, in final

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William J. Randel, Duane E. Stevens, and John L. Stanford

c)36 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 44, No. 6A Study of Planetary Waves in the Southern Winter Troposphere and Stratosphere. Part II: Life Cycles WILLIAM J. RANDEL* AND DUANE E. STEVENSDepartment of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523 JOHN L. STANFORDDepartment of Physics, Iowa State University, Ames, IA $0010(Manuscript received 7

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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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