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Sergio A. Sejas and Ming Cai

atmosphere, ocean, and land are changed. The perturbed variables of the climate system can amplify or suppress the surface warming response to the CO 2 forcing alone (i.e., without feedbacks). It is these climate feedbacks, triggered by the CO 2 forcing, that account for most of the global surface warming response ( Hansen et al. 1984 ; Wetherald and Manabe 1988 ; Zhang et al. 1994 ; Colman 2003 ; Soden and Held 2006 ; Taylor et al. 2013 ; Yoshimori et al. 2014 ). When the forcing and climate

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Paul F. Fanelli and Peter R. Bannon

1. Introduction A variety of perturbations frequently force the compressible atmosphere out of its approximate hydrostatic and geostrophic state. The atmosphere must adjust to these imbalances toward a new equilibrium state. This atmospheric adjustment process involves the generation of both buoyancy and acoustic modes that act to redistribute mass, momentum, and entropy so that a new balance is reached. Chagnon and Bannon (2005a) provide a recent survey of the literature. Chagnon and Bannon

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Werner Metz

15JULY 1986 WERNER METZ 1467Transient Cyclone-Scale Vorticity Forcing of Blocking Highs WERNER METZMeteorological Institute, University of Ml~nchen, FRG(Manuscript received 10 July 1985, in final form 5 February 1986)ABSTRACT The forcing of Northern Hemisphere blocking highs by the transient vorticity transfer from the cyclone-scaleeddies into the planetary flow is investigated

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Gerald Schubert and Richard E. Young

Atmospheres.The 4-Day Venus Circulation Driven by Periodic Thermal Forcing GERALD SCHUBERT AND RICHARD E. YOUNgDept. of Planetary and Space Science, University of California at Los A ngdes(Manuscript received 30 March 1970)ABSTRACT It has been proposed that the observed 4-day retrograde rotation of the Venus atmosphere is a zonalmotion of at least the upper atmosphere driven by periodic solar thermal forcing. We have assessed therelative importance of periodic thermal forcing for the atmospheres of

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Sylvain Mailler and François Lott

distinction between the drag forces that are opposed to the low-level winds and the lift forces that are perpendicular to them. At the mesoscale, where the mountain flow dynamics is controlled by gravity waves and includes low-level flow blocking, the drag force is very important, whereas at the synoptic and planetary scales the lift force plays a key role and causes vortex compression over mountains ( Smith 1979 ). By triggering baroclinic wave development and forcing planetary-scale waves, these lift

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Hong-Li Ren, Fei-Fei Jin, and Jong-Seong Kug

atmospheric circulation? Previous studies have concluded that the LFV is internal to atmospheric dynamics. The internal dynamics in atmospheric models without external forcing can display significant LFV and the pure nonlinear eddy–mean flow interactions can generate a substantial amount of LFV (e.g., Held 1983 ; Egger and Schilling 1983 ; Hendon and Hartmann 1985 ; Cai and Mak 1990 ; Cai and van den Dool 1991 ; Lau and Nath 1991 ; Robinson 1991 ; Branstator 1995 ; Whitaker and Barcilon 1995

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Rajul E. Pandya and M. Joan Alexander

detailed vertical profile of the heating. Thus many features of the observations of convectively forced planetary-scale waves can be accounted for within a linear framework using only the depth of the convective heating and the zonal mean wind variations. A similar approach has been applied to smaller-scale waves in the inertia-gravity wave portion of the spectrum ( Manzini and Hamilton 1993 ; Bergman and Salby 1994 ). Manzini and Hamilton (1993) examined the role of convective heating in forcing

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James W. Hurrell

2286 JOURNAL OF THE ATMOSPHERIC SCIENCES VoL, 52, No. 12Transient Eddy Forcing of the Rotational Flow during Northern Winter JAMES W. HURRELLNational Center for Atmospheric Research,* Boulder, Colorado(Manuscript received 20 September 1994, in final form 23 January 1995) ABSTRACT The total direct transient eddy forcing of the vorticity

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Mark DeMaria

1944 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 42, No. 18Linear Response of a Stratified .Tropical Atmosphere to Convective Forcing MARK DEMARIA*National Center for Atmospheric Research,~ Boulder, CO 80307(Manuscript received 6 August 1984, in final form 8 May 1985)ABSTRACI' The three-dimensional response of the tropical atmosphere to an isolated heat source is investigated using aprimitive equation model linearized about a

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Christopher M. Strong, Fei-Fei Jin, and Michael Ghil

I SEPTEMBER 1993 STRONG ET AL. 2965Intraseasonal Variability in a Barotropic Model with Seasonal Forcing CHRISTOPHER M. STRONG, FEI-FEI JIN, * AND MICHAEL GHILClimate Dynamics Center, Department of Atmospheric Sciences, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California (Manuscript received 4 September

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