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Michael Blackburn

2604 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 42, NO. 23Interpretation of Ageostrophic Winds and Implications for Jet Stream Maintenance MICHAEL BLACKBURNDepartment of Meteorology, University of Reading, Reading RG6 2A4, England(Manuscript received 17 August 1984, in final form 18 June 1985)The use of ageostrophic flow to infer the presence of vertical circulations in the entrances and exits

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John W. Glendening

VOL. 50, NO. 12 JOURNAL OF THE ATMOSPHERIC SCIENCES 15JUNEI993Nonlinear Displacement of the Geostrophic Velocity Jet Created by Mass Imbalance JOHN W. GLENDENINGDepartmen~ of Meteorology, * Naval Postgraduate School, Monterey, California(Manuscript received 3 June 1991, in final form 1 May 1992) ABSTRACT Nonlinear geostrophic adjustment to a mass imbalance is investigated analytically, focusing

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Cegeon J. Chan and R. Alan Plumb

and Polvani (2009) , who found the PK state and its annular mode decorrelation times to be very sensitive to the model’s lower boundary condition. The long decorrelation time of the PK cases is a reflection of the fact that their tropospheric climatology sits at a transition at which the eddy-driven jet separates from the subtropical jet. The method of how the decorrelation time τ is calculated, how the model is set up, and details of each model experiment are described in section 2 . The

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Gwendal Rivière, Loïc Robert, and Francis Codron

1. Introduction Midlatitude jet variability is usually described using the leading empirical orthogonal function (EOF) of the zonally averaged zonal wind, sometimes called the zonal index ( Yu and Hartmann 1993 ; Feldstein and Lee 1998 ; Gerber and Vallis 2007 ). This index is closely related to the leading EOF of the tropospheric geopotential height, the so-called annular mode introduced by Thompson and Wallace (2000) . These modes of jet variability mainly represent latitudinal

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Christopher A. Davis, Sarah C. Jones, and Michael Riemer

1. Introduction A salient aspect of the extratropical transition (ET) of tropical cyclones is the downstream cyclone development it can induce in the midlatitudes. An important component of the decline in hemispheric predictive skill associated with ET is uncertainty about the interaction of the tropical cyclone with a westerly jet ( Jones et al. 2003 ). One of the key contributors to the uncertainty is the development of the downstream ridge connected with the outflow of the tropical cyclone

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Hannu Savijärvi and Tero Siili

I JANUARY 1993 SAVIJ~RVI AND SIILI T~The Martian Slope Winds and the Nocturnal PBL Jet HANNU SAVIJ,~RVIDepartment of Meteorology, University of Helsinki, Helsinki, Finland TERO SIILIFinnish Meteorological Institute, Helsinki, Finland(Manuscript received 18 October 1991, in final form 10 March 1992)ABSTRACT The summertime Martian PBL diurnal wind variation, slope

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David M. Rubenstein

214 ~OURNAL OF THE ATMOSPHERIC SCIENCES VOL~JM~3The Daytime Evolution of the East African Jet DAVID M. RUBENSTEII~Science Applications, Inc., McLean, VA 22102(Manuscript received 8 April 1980, in final form 29 September 1980) ABSTRACT We present a combined observational and theoretical study of the daytime evolution of the equatorialEast African low-level jet stream

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G. Brunet and P. H. Haynes

JOURNAL OF THE ATMOSPHERIC SCIENCES VOL.$2, No. 4The Nonlinear Evolution of Disturbances to a Parabolic Jet G. BRUNET*Laboratoire de Mdtdorologie Dynamique du CNR$, Ecole Normale Supdrieure, Paris, France P. H. HAYNESCentre for Atmospheric Science, * Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United Kingdom (Manuscript

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S. B. Trier, C. A. Davis, D. A. Ahijevych, M. L. Weisman, and G. H. Bryan

to use a numerical simulation of a weeklong period of successive coherent propagating rainfall episodes to examine mechanisms supporting nocturnal convection and its subsequent decay after sunrise. A detailed theory of organized nocturnal convection does not currently exist, however its association with several common environmental factors has been widely documented. The Great Plains nocturnal southerly low-level jet (LLJ), which studies have linked to differential cooling of the sloped terrain

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K. Swanson and R. T. Pierrehumbert

394 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 51, No. 3Nonlinear Wave Packet Evolution on a Baroclinicaily Unstable Jet K. SWANSON AND R. T. I~-R~Y_~JMBERTDepartment of Geophysical Scie~es, Universi~ of Chicago, Chicago, [ll~o~~ipt ~ived 15 March 1993, ~ ~ fo~ 16 lunc 1~3)ABSTRACT Numerical simulations of the inviscid, nonlinear life cycle of wave packets emerging from a zonally localizedinitial

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