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Judith Berner

nonlinear processes. Certainly, a more accurate representation of nonlinear processes would be desirable, but is hampered by the data requirements posed by the estimation of a high-dimensional nonlinear operator. On the other hand, a number of studies have suggested that tropospheric planetary wave behavior is fundamentally nonlinear ( Legras and Ghil 1985 ; Hansen and Sutera 1986 ; Itoh and Kimoto 1999 ). These have been motivated by the highly truncated planetary wave theory of Charney and DeVore

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William J. Randel

VOL. 44, NO. 6 JOURNAL OF THE ATMOSPHERIC SCIENCES 15 MARCH 1987A Study of Planetary Waves in the Southern Winter Troposphere and Stratosphere. Part I: Wave Structure and Vertical Propagation WILLIAM J. RANDELNational Center for Atmospheric Research,* Boulder, CO 80307(Manuscript received 2 January 1986, in final form 25 August 1986) Planetary wave propagation in the southern winter troposphere

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Anthony D. Del Genio and William B. Rossow

I FEBRUARY 1990 ANTHONY D. DEL GENIO AND WILLIAM B. ROSSOW 293Planetary-Scale Waves and the Cyclic Nature of Cloud Top Dynamics on Venus ANTHONY D. DEL GENIO AND WILLIAM B. ROSSOWNASA/Goddard Space Flight Center, Institute for Space Studies, New York, New York(Manuscript received I January 1989, in final form 3 August 1989) ABSTRACT Pioneer Venus OCPP ultraviolet images spanning

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Christian Franzke, Andrew J. Majda, and Grant Branstator

1. Introduction The driving forces and dominant functional form of planetary wave dynamics is an important topic in recent literature. Depending on the school of thought, planetary wave dynamics are either dominated by deterministic linear dynamics that are driven by additive white noise ( Penland and Sardeshmukh 1995 ; Newman et al. 1997 ; Branstator and Haupt 1998 ; Branstator and Frederiksen 2003 ) or are intrinsically nonlinear. The latter view is motivated by studies of highly truncated

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Y. Orsolini and P. Simon

VOL. 52, NO. 22 JOURNAL OF THE ATMOSPHERIC SCIENCES 15NOVEMBER 1995Idealized Life Cycles of Planetary-Scale Barotropic Waves in ~he Middle Atmosphere Y. ORSOLINI AND P. SIMONMdtdo-France, Centre National de Recherches Mdtdorologiques, Toulouse, France(Manuscript received 3 November 1993, in final form 10 March 1994)ABSTRACT A nonlinear nondivergent barotropic model is used to

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Grant Branstator and Judith Berner

1. Introduction a. Background Depending on the body of scientific papers one reads and the emphasis of the techniques they employ, one can either conclude that tropospheric planetary wave behavior is largely understandable in terms of linear dynamics or that these waves are fundamentally nonlinear. Given this situation one might guess that both views have some merit and that it would be helpful to have a means of quantifying the relative contributions of the two types of dynamics to planetary

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Nicholas J. Lutsko

that this instability is a necessary (though not sufficient) condition for superrotation in planetary atmospheres with axisymmetric forcing. In a related study, Polichtchouk and Cho (2016) found that superrotation can be generated in the presence of a weak equator-to-pole temperature gradient because of the reduction of breaking baroclinic waves from the midlatitudes and because of the presence of barotropic instability in the deep tropics. Polichtchouk and Cho also investigated the sensitivity

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Sandro W. Lubis, Katja Matthes, Nour-Eddine Omrani, Nili Harnik, and Sebastian Wahl

1. Introduction The vertical transport of energy via planetary-scale waves, forced by orography and land–ocean heating asymmetries, represents an important source of mutual dynamic coupling between the stratosphere and troposphere. The waves transport total eddy momentum and heat fluxes and therefore lead to a deviation of the stratospheric mean state from radiative equilibrium. An intensification of these planetary-scale waves occurs in winter, in the presence of westerly winds weaker than a

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Murry L. Salby

( Brewer 1949 ; Dobson 1956 ; Murgatroyd and Singleton 1961 ). The residual circulation is driven by planetary waves that transmit momentum upward from the troposphere. When absorbed, that momentum drives a poleward drift, which converges at high latitude to force mean downwelling. The accompanying adiabatic warming maintains Arctic temperature as warmer and the polar-night vortex as weaker than each would be under conditions of radiative equilibrium. Compensating that vertical motion at lower

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John P. Boyd

770JO'URNAL OF THE ATMOSPHERIC SCIENCESVOLUM- 39The Influence of Meridional Shear on Planetary Waves. Part 2: Critical Latitudes JOHN P. BOYDlCenter for Earth and Planetary Physics, Harvard University, Cambridge, M.4 02158(Manuscript received 9 March 1981, in final form 2 December 1981)ABSTRACT With the simplifying assumption that the mean zonal wind is a function of latitude only, numerical andanalytical methods are applied to study the effects of critical

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