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C. G. Justus and Arthur Woodrum

OCTOBF. R1973 C. G. JUSTUS AND ARTHUR WOODRUM 1267Upper Atmospheric Planetary-Wave and Gravity-Wave Observations C. G. JUSTUSSchool of Aerospace Engineering, Georgia -nstitute of Technology, Atlanta 30332ARTHUR WOODRUM&hool of Physics, Georgia Southern College, Statesboro 30458(Manuscript received 16 February 1973, in revised form 7 May 1973)ABSTRACT Previously collected data

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Carlos F. M. Raupp and Pedro L. Silva Dias

1. Introduction The atmospheric flow is characterized by the existence of low-frequency fluctuations with time scales ranging from 20 to around 100 days ( Madden and Julian 1972 , 1994 ; Hayashi and Golder 1993 ; Ghil and Mo 1991 ). The dominant component of this intraseasonal variability of the atmospheric circulation in the tropics is the 40–50-day Madden–Julian oscillation (MJO), which is characterized in the troposphere by a planetary-scale (wavenumber 1–2) wave envelope having an

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Roland A. Madden

SEPTEMBER 1978 R O L A N D' A. M A D D E N 1605Further Evidence of Traveling Planetary Waves ROLAND A. MADDENNational Center for Atmospheric Research,~ Boulder, CO 80307(Manuscript received 1 March 1978, in final form 1 May 1978)ABSTRACT Evidence of regularly propagating, laige-scale waves is found in a 73-year record of Northern Hemispheresea-level pressure data and in a nine-year record.of upper

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Thomas Birner and Paul D. Williams

1. Introduction The stratospheric circulation in winter is dominated by a strong cyclonic vortex over the pole. In principle, this polar vortex is driven by radiative cooling due to polar night. However, planetary waves frequently perturb the vortex in terms of both position and strength. For sufficiently strong planetary wave forcing, these disturbances can grow enough to destroy the polar vortex as a well-organized entity. These abrupt transitions are usually associated with a reversal of the

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Kevin E. Trenberth and Shyh-Chin Chen

2934 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 45, NO. 20Planetary Waves Kinematica!ly Forced by Himalayan Orography KEVlN E. TRENBERTHNational Center for Atmosoheric Research.* Boulder, Colorado SHYH..CHIN CI-~ENScripps Institution of Oceanography, La Jolla, California(Manuscript received 4 December 1987, in final form 13 April 1988) An analysis is made of the planetary-seale response

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Jinggao Hu, Rongcai Ren, and Haiming Xu

1. Introduction The large-scale circulation in the extratropical stratosphere cycles between circumpolar westerlies during winter and circumpolar easterlies during summer every year. The winter circumpolar westerlies characterize the life cycle of the stratospheric polar vortex. In winter, planetary waves from the troposphere can penetrate into the stratosphere and perturb the circumpolar westerlies, which are responsible for the recurrent stratospheric sudden warming events (SSWs) ( Matsuno

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Diane Pendlebury and Theodore G. Shepherd

circulation ( Dunkerton 1989 ; Plumb and Eluszkiewicz 1999 ; Semeniuk and Shepherd 2001b ). The applied torque that drives the Brewer–Dobson circulation arises mainly from planetary-scale Rossby waves, which are generated in the troposphere and propagate into the middle atmosphere where they grow in amplitude, break, and dissipate. (The stratospheric circulation is also affected by gravity wave drag, but this is a secondary contribution.) Dissipating planetary waves apply a negative torque, and so

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Ping Chen and Walter A. Robinson

15DECEMBER 1992 CHEN AND ROBINSON 2533Propagation of Planetary Waves between the Troposphere and Stratosphere PING CHEN* AND WALTER A. ROBINSONDepartment of Atmospheric Sciences, University of lllinois at Urbana-Champaign, Urbana, Illinois(Manuscript received 30 September 1991, in final form 24 February 1992)ABSTRACT The propagation of planetary waves between the troposphere and

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Xun Zhu, Jeng-Hwa Yee, E. R. Talaat, M. Mlynczak, and J. M. Russell III

1. Introduction In the mesosphere and lower thermosphere (MLT), tidal waves and planetary-scale waves are the leading modes of variability and have important global effects on circulation and photochemistry (e.g., Forbes et al. 1993 , 1997 ; Zhu et al. 2000 ). This makes the systematic and comprehensive studies of global change in the MLT from satellite measurements especially valuable. One of the fundamental problems in large-scale atmospheric dynamics is how the background zonal mean and

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Thomas Dubos, Philippe Drobinski, and Pierre Carlotti

layer. J. Atmos. Sci. , 64 , 137 – 156 . Esau , I. , 2003 : The Coriolis effect on coherent structures in planetary boundary layers. J. Turbul. , 4 , 17 . Etling , D. , and R. Brown , 1993 : Roll vortices in the planetary boundary layer: A review. Bound.-Layer Meteor. , 65 , 215 – 248 . Finnigan , J. J. , and R. H. Shaw , 2000 : A wind-tunnel study of airflow in waving wheat: An EOF analysis of the structure of the large-eddy motion. Bound.-Layer Meteor. , 96 , 211

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