On the Meridional Structure of Annular Modes

Journal of Climate;  June 15, 2005 ;     700+ words ......orthogonal function (EOF) of a time-dependent zonal jet is a simple consequence of the north...candidate is the presence of a time dependent zonal jet. In this note we illustrate how, irrespective...relationship between different types of zonal jet variability and the resulting EOFs ...

Statistics of an Unstable Barotropic Jet from a Cumulant Expansion

Journal of the Atmospheric Sciences;  June 1, 2008 ;     700+ words ......linear relaxation toward an unstable zonal jet. For relatively short relaxation times...linear relaxation toward an unstable zonal jet. Depending on a single control parameter...the absolute vorticity q^sub jet^ of a zonal jet on a relaxation time τ. The zonal...

Inertial gyre driven by a zonal jet emerging from the western boundary

Journal of Physical Oceanography;  August 1, 2002 ;     700+ words ...Inertial Gyre Driven by a Zonal Jet Emerging from the Western Boundary...a recirculation gyre driven by a zonal jet on a beta plane is considered. In...the Grand Banks becomes almost a zonal jet vigorously meandering and shedding...

'ZONAL' JET STREAM CHARTS A STRAIGHT PATH

Roanoke Times & World News;  January 4, 2006 ;     520 words ......entirely, instead of merely stopping to "reload" as we thought it might -- a basically "zonal" jet stream pattern has developed across the United States. A zonal jet stream pattern simply means that the stream of fast- moving air high in the atmosphere...

CORRIGENDUM

Journal of Physical Oceanography;  January 1, 2007 ;     85 words ...Because of a production error in "Barotropic Instability of a Zonal Jet: From Nondivergent Perturbations on the β plane to Divergent Perturbations on a Sphere," by Nathan Paldor and Yona Dvorkin...

Characterizing Midlatitude Jet Variability: Lessons from a Simple GCM

Journal of Climate;  August 15, 2005 ;     700+ words ...ABSTRACT Fluctuations in the tropospheric zonal jet are often characterized using anomaly...in the interpretation of tropospheric zonal jet variability. (ProQuest Information and...Introduction Fluctuations in the tropospheric zonal jet may be characterized using anomaly patterns...

On the Nature of Zonal Jet EOFs

Journal of Climate;  December 15, 2006 ;     700+ words ......obtained for the mean and covariance structure of an idealized zonal jet that fluctuates in strength, position, and width. Through a...simulations of the EOF structure of an idealixed midlatitude zonal jet [as in Fyfe (2003) and Fyfe and Lorenz (2005)] characterized...

Mild streak is brought to you by jet stream

The Milwaukee Journal Sentinel;  November 24, 1998 ;     219 words ......when we experienced snowstorms and very cold temperatures. In fact, the record low for today is 5 below zero. We have a fast, zonal jet stream to thank for this mild weather pattern. The wind flow around 30,000 feet across the Pacific and much of the northern...

On the Lagrangian Dynamics of Atmospheric Zonal Jets and the Permeability...

Journal of the Atmospheric Sciences;  October 1, 2007 ;     700+ words ......zonal flow with an isolated maximum (a zonal jet) on which two or more traveling Rossby...stratosphere are characterized by a nearly zonal jet; the polar vortex can he defined as the...in close proximity to the core of the zonal jet, and that these provide a barrier to...

A Mechanism and Simple Dynamical Model of the North Atlantic Oscillation...

Journal of the Atmospheric Sciences;  February 1, 2004 ;     700+ words ......Typically, the leading modes of variability may be characterized as a mixture of "wobbles" in the zonal jet position and "pulses" in the zonal jet strength. If the stochastic forcing is statistically zonally uniform, then the resulting patterns...

Bifurcation in eddy life cycles: Implications for storm track variability

Journal of the Atmospheric Sciences;  April 15, 2003 ;     700+ words ......produce anticyclonic wave breaking and a poleward shift of the zonal jet will occur. For moderate forcing, anticyclonic wave breaking occurs and consequently, as before, a poleward shift of the zonal jet will occur. However, there is an important distinction between...

Does an unstable baroclinic wave equilibrate/decay baroclinically or...

Journal of the Atmospheric Sciences;  February 15, 2000 ;     700+ words ......severe symmetry constraint such as the case of an unrealistic zonal jet that has vertical antisymmetry with respect to the midlevel...clarify why the unstable waves of a seemingly representative zonal jet in the high-resolution QG model of Welch and Tung (1998) evolve...

Zonal Jet Structure and the Leading Mode of Variability

Journal of Climate;  October 15, 2007 ;     700+ words ......where a simple GCM is used to investigate the effects of the zonal jet structure on the leading mode of variability in the Northern...January-mean observational data that highlights the differences in the zonal jet structure and leading mode of variability over the Atlantic...

Barotropic Instability of a Zonal Jet: From Nondivergent Perturbations on...

Journal of Physical Oceanography;  December 1, 2006 ;     700+ words ...ABSTRACT The linear instability of divergent perturbations that evolve on a cos^sup 2^ mean steady zonal jet embedded in a zonal channel on the β plane and on a rotating sphere is studied for zonally propagating wavelike perturbations...

Annular Modes in a Multiple Migrating Zonal Jet Regime

Journal of the Atmospheric Sciences;  November 1, 2007 ;     700+ words ......similarities to the observed atmospheric annular modes, where the leading mode of variability is associated with the primary zonal jet's meridional undulation, secondary (weaker) jets emerge and systematically migrate equatorward. The model output suggests the...