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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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Seok-Woo Son and Sukyoung Lee

1. Introduction There are two types of tropospheric jets: the subtropical jet (STJ) that is driven by angular momentum transfer from the deep Tropics through the Hadley circulation ( Schneider 1977 ; Held and Hou 1980 ; Lindzen and Hou 1988 ) and the eddy-driven or polar-front jet (PFJ) that is generated by midlatitude baroclinic eddies ( James 1994 ). As such, while the two jets are not dynamically independent of each other, the STJ would exist in an eddy-free state, but the PFJ owes its

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T. J. Herron and I. Tolstoy

266 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL~26Tracking Jet Stream Winds from Ground Level Pressure Signals~ T. J. I-I~xao~~' x~D I. To~.sTox~H~dson Laboratories of Col~mbia University, Dobbs Ferry, N. Y.(Manuscript received 29 June 1968, in revised form 18 September 1968)ABSTRACT A major portion of atmospheric pressure fluctuations in the 30--90 rain period range was observed to

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A. J. Simmons

1670 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUME34NOTES AND CORRESPONDENCEA Note on the Instability of the African Easterly JetA. J. S~o~su. K. Universities' Atmospheric Modelling Group, Department of Meteorology, University oJ Reading, England22 March 1977 and 14 June 1977ABSTRACT A stability analysis has been performed for an easterly lower tropospheric jet which approximates theobserved flow over West Africa

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Zhangai Luo and David C. Fritts

104 JOURNAL OF THE ATMOSPHERIC SCIENCES VOL. 50, NO. IGravity-Wave Excitation by Geostrophic Adjustment of the Jet Stream. Part II: Three-Dimensional Forcing ZHANGA1 LUO AND DAVID C. [~"~ITTSLaboratory for Atmospheric and Space Physics and Department of Electrical and Computer Engineering, University of Colorado, Boulder, Colorado (Manuscript received 13

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Mankin Mak

1. Introduction Localized jets are ubiquitous in the atmosphere and the winter mean large-scale localized jets in the Northern Hemisphere are well-documented (e.g., Fig. 6.2 in Holton 1992 ). There have been a number of analyses of the instability properties of such general shear flows in idealized settings (e.g., Frederiksen 1979 ; Pierrehumbert 1984 , hereafter P84; Mak and Cai 1989 ; Cai and Mak 1990 ; Farrell 1989 ; Samelson and Pedlosky 1990 ; Borges and Hartmann 1992 ; and others

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T. N. Krishnamurti and Vince Wong

OCTOBER 1979 T.N. KRISHNAMURTI AND VINCE WONG 1895A Planetary Boundary-Layer Model for the Somali jet T. N. KRISHNAMURTI AND VINCE WONGDepartment of Meteorology, Florida State University, Tallahassee .12306(Manuscript received 9 January 1978, in final form 16 February 1979)ABSTRACT In this paper we investigate a baroclinic boundary layer of cross

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Dennis L. Hartmann

VOL. 40, NO. 4 JOURNAL OF THE ATMOSPHERIC SCIENCES APRIL 1983Barotropic Instability of the Polar Night Jet Stream~ DENNIS L. HARTMANNDepartment of Atmospheric Sciences, University of Washington, Seattle, Washington 98195(Manuscript received 23 August 1982, in final form 15 November 1982)ABSTRACT An eigenvalue analysis of the nondivergent barotropic model on a sphere and an initial value

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Ludivine Oruba, Guillaume Lapeyre, and Gwendal Rivière

1. Introduction A commonly observed feature of midlatitude winter cyclones is their tendency to cross the axis of the climatological jet streams from the equatorward to the poleward side as deduced from case-to-case observational maps ( Palmen and Newton 1969 , see their Fig. 3.17), bandpass filtered atmospheric fields ( Blackmon et al. 1977 ; Wallace et al. 1988 ), or Lagrangian-based automatic tracking algorithms ( Hoskins and Hodges 2002 ; Neu et al. 2013 ). It fits with our common

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Huei-Ping Huang and Walter A. Robinson

by Basdevant et al. (1981) . Since strong zonal jets are commonly seen in planetary circulations (e.g., terrestrial and Jovian flows), the simulation of the zonal flow itself is of great interest. Based on Rhines’ thinking, attempts have been made to generate persistent zonal jets in models of forced two-dimensional turbulence. Using a sector model (e.g., on one-sixteenth of the surface of a sphere) with stochastic forcing at small scales, Williams (1978) simulated multiband zonal jets that

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