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Charles Cohen

132 JOURNAL OF THE ATMOSPHERIC SCIENCESNumerical Experiments Showing the Response of Parameterized Convection to Large-Scale Forcing CHARLES COHENDepartment of Meteorology, The Pennsylvania State University, University Park. Pennsylvania(Manuscript received 28 December 1987, in final form 29 July 1988)ABSTRACT In a series of experiments with a two-dimensional mesoseale numerical model that uses the Frank-Cohencumulus parametefization

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J. F. Scinocca and R. Ford

1. Introduction When instability initially develops in an unstable stratified shear flow, eddies of scale proportional to the shear depth form in the region of strong shear. The mechanism by which these eddies can force large-scale internal gravity waves is of fundamental interest in the dynamics of the atmosphere and the ocean. By “large-scale” waves we mean waves with large horizontal wavelengths compared with the typical horizontal wavelength of stratified shear instability (i.e., the

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John R. Anderson and Duane E. Stevens

676 $OURNAL OF THE ATMOSPHERIC SCIENCES VOL. 44, NO. 4The Response of the Tropical Atmosphere to Low Frequency Thermal Forcing JOHN R. ANDERSON* AND DUANE E. STEVENSDepartment of Atmospheric Science, Colorado State University, Fon Collins, CO 80523(Manuscript received 9 December 1985, in final form 13 August 1986) The tropical response to a localized thermal forcing with approximately 4S-day period is

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Peter M. Norris and Arlindo M. da Silva

source of uncertainty in GCM studies of future climate. Part of the historical problem has been that, in the face of these complexity and scale mismatch problems, simple empirical cloud parameterizations have been devised and then just tuned to give reasonable top-of-atmosphere radiative forcing in a globally or zonally averaged sense. Sufficient attention has not generally been given to the validation of the predicted cloud properties. In the NWP community even less attention has historically been

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Alain Lahellec and Jean-Louis Dufresne

the literature (e.g., Dessler 2010 ; Lindzen and Choi 2009 , and comment articles). The methodological difficulty in separating climate forcing and rapid adjustment from feedback is also addressed in Stocker et al. (2014) . 1 It is mathematically difficult to justify a linear behavior from high-dimensional, nonlinear systems, because this calls for integro-differential functional techniques. In the first of these two papers ( Lahellec and Dufresne 2013 , hereafter Part I ), we approached the

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David A. Schecter

theory of tilt dynamics. a. Review of the theory at issue The literature contains a number of articles on the tilt dynamics of nonconvective vortices in a stably stratified atmosphere. Some of these articles discuss how vortices resist tilting under sustained vertical wind shear ( Jones 1995 , 2000a , b , 2004 ; Vandermeirsh et al. 2002 ; Reasor et al. 2004 , hereafter R04 ). Others focus on the decay of tilt in the absence of external forcing ( Polvani 1991 ; Viera 1995 ; Reasor and

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Richard E. Young and Gary L. Villere

I OCTOBER 1985 RICHARD E. YOUNG AND GARY L. VILLERE 1991Nonlinear Forcing of Planetary Scale Waves by Amplifying Unstable Baroclinic Eddies Generated in the TroposphereRICHARD E. YOUNGSpace Science Division, NASA-Ames Research Center, Moffett Field, CA 94035GARY L. VILLEREInformatics Professional Services, Inc., Palo Alto, CA 94303(Manuscript received 25 October 1984, in final form 2 April 1985)ABSTRACT A global

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Nikki C. Privé and R. Alan Plumb

1. Introduction It was proposed in the companion paper ( Privé and Plumb 2007 , hereafter Part I ) that the location of the deep ascent branch of an angular momentum conserving circulation is strongly tied to the distribution of subcloud moist static energy. If a localized region of subtropical forcing is strong enough to induce such a meridional circulation, the dividing streamline at the boundary of the circulation, where there is no horizontal advection in the free troposphere, should be

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Brian J. Hoskins and David J. Karoly

JUNE 1981 BRIAN J. HOSKINS AND DAVID J. KAROLY 1179The Steady Linear Response of a Spherical Atmosphere to Thermal and Orographic Forcing~ BRIAN J. HOSK1NS AND DAVID J. KAROLY2U.K. Universities' Atmospheric Modelling Group and Department of Meteorology, University of Reading, RG6 2AU England(Manuscript received 21 November 1980, in final form 23 February 1981)ABSTRACT Motivated by some results

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Wayne E. Sangster

isobaric at andabove the 500-mb level. A method of representing the field of the horizontal pressure force in the nonisobariccoordinate surfaces, using geostrophic stream and potential functions, is described. Geostrophic windscomputed from these functions are compared with those obtained from the customary sea-level charts andwith observed winds.1. IntroductionCharts depicting the atmospheric conditions in isobaric surfaces are now generally used in conventionalas well as numerical forecasting. These

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