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Hisannori Itoh

I MAY 1985 HISANORI ITOH 917The Role of Transient Motions in the Formation of Quasi-Stationary Planetary Waves HISANORI ITOHDepartment of Earth Sciences, Faculty of Education, Wakayama University, Wakayama, 640 Japan(Manuscript received 10 September 1984, in final form 22 Janumy 1985) ABSTRACT We investigate numerically, using bifurcation theory, the formation of quasi

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Dehai Luo

) . However, many investigators have documented a frequent coincidence of planetary-scale traveling waves and blocking in Northern Hemisphere data ( Austin 1980 ; Lejenäs and Döös 1987 ; Lejenäs and Madden 1992 ). Lindzen et al. (1984) speculated that slowly propagating Rossby waves could contribute to persistent anomalies. Dole (1986) found a tendency for retrogression of waves 1 and 2 in the 500-hPa height field before a major amplification. In an energetic analysis in the wavenumber domain of

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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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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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Taroh Matsuno

1970 T A R O H M A T S U N O 871Vertical Propagation of Stationary Planetary Waves in the Winter Northern Hemisphere TAROH MATSUNO~Deptr of Atmospheric Sciences, University of Washington, Seattle(Manuscript received 16 March 1970)ABSTRACT Planetary-scale, stationary disturbances in the winter stratosphere are considered to be upward propagating internal Rossby waves forced

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Nili Harnik and Richard S. Lindzen

1. Introduction and motivation In this work we study how the basic-state wave propagation characteristics, and in particular the geometry of reflecting surfaces, affect the variability in the vertical structure of stratospheric planetary waves in a simple model and in observations of the Southern Hemisphere winter. The most common theory for stratospheric planetary waves is linear wave theory. Charney and Drazin (CD; 1961) were the first to treat stratospheric perturbations as vertically

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V. Hayashi and D. G. Golder

APRIL I983 Y. HAYASHI AND D. G. GOLDER 951Transient Planetary Waves Simulated by GFDL Spectral General Circulation Models. Part II: Effects of Nonlinear Energy Transfer Y. HAYASHI AND D. G. GOLDERGeophysical Fluid Dynamics Laboratory/NOlO`4, Princeton University, .Princeton, NJ 08540(Manuscript received 20 April 1982, in final form 12 November 1982) ABSTRACT

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C.B. Leovy, C-R. Sun, M.H. Hitchman, E.E. Remsberg, J.M. Russell, III, L.L. Gordley, J.C. Gille, and L.V. Lyjak

230 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 42, NO. 3Transport of Ozone in the Middle Stratosphere: Evidence for Planetary Wave BreakingC. B. L-ovY, C-R. SUN, M. H. HITCHMAN AND E. E. REMSBERG1Department of Atmospheric Sciences, University of Washington, Seattle, W/I 98195 J. M. RUSSELL, III AND L. L. G-ORDLEYNASA Langley Research Center, Hampton. VA 23665 J. C. GILLE AND L. V. LYJAKNational Center for Atmospheric Research

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John P. Boyd

756 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUME39The Influence of Meridionai Shear on Planetary Waves. Part 1: Nonsingular Wind Profiles JOHN P. BOYDICenter for Earth and Planetary Physics, Harvard University, Cambridge. M,4 02138(Manuscript received 9 March 1981, in final form 3 December 1981 ) ABSTRACT Using a simple separable model in which the mean wind U(y) is

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Ioana M. Dima and John M. Wallace

1. Introduction The equatorial planetary waves (EPW), forced by zonal asymmetries in the distribution of diabatic heating, are an important element in the global general circulation. They force the zonal flow by inducing equatorward eddy fluxes of westerly momentum at the jet stream level. In the annual mean, the eddy flux convergence would produce a strong equatorial superrotation were it not balanced by a flux divergence of westerly momentum by the zonally symmetric component of the

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