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RISA Nonacceleration Theorem for Transient Quasi-geostrophic Eddies on a Three-Dimensional Time-Mean Flow
Publisher: American Meteorological Society
Abstract: A nonacceleration theorem is derived for small-amplitude, transient quasi-geostrophic eddies on a three-dimensional time-mean flow. This theorem states that the divergence of the eddy potential vorticity flux?and hence the ...
Forced Waves in a Baroclinic Shear Flow. Part 2: Damped and Undamped Response to Weak Near-Resonant Forcing
Publisher: American Meteorological Society
Abstract: This paper is a continuation of a study of the response of a two-layer baroclinic fluid to weak, near resonant planetary wave forcing. Unlike Part I (Plumb, 1979), the fluid is baroclinically stable and viscous damping is ...
Instability of the Distorted Polar Night Vortex: A Theory of Stratospheric Warmings
Publisher: American Meteorological Society
Abstract: The properties and stability of forced planetary waves in a continuous baroclinc shear are investigated gated using a weakly nonlinear analysis. A steady solution exists which under certain conditions may be unstable via ...
A New Look at the Energy Cycle
Publisher: American Meteorological Society
Abstract: The traditional derivation of the energy cycle is reviewed and some paradoxical properties of the energy conversion and flux terms under non-acceleration conditions (steady, conservative motion) are noted. An alternative ...
On the Three-Dimensional Propagation of Stationary Waves
Publisher: American Meteorological Society
Abstract: A locally applicable (nonzonally-averaged) conservation relation is derived for quasi-geostrophic stationary waves on a zonal flow, a generalization of the Eliassen-Palm relation. The flux which appears in this relation ...
An Alternative Form of Andrews' Conservation Law for Quasi-geostrophic Waves on a Steady, Nonuniform Flow
Publisher: American Meteorological Society
Abstract: This note reports the derivation of an alternative form of Andrews' conservation law for small-amplitude, quasi-geostrophic, transient eddies on a steady but spatially nonuniform flow.
Three-Dimensional Propagation of Transient Quasi-Geostrophic Eddies and Its Relationship with the Eddy Forcing of the Time—Mean Flow
Publisher: American Meteorological Society
Abstract: An approximate theory is developed of small-amplitude transient eddies on a slowly varying time-mean flow. Central to this theory is a flux MT, which in most respects constitutes a generalization of the Eliassen?Palm flux ...
Baroclinic Instability of the Summer Mesosphere: A Mechanism for the Quasi-Two-Day Wave?
Publisher: American Meteorological Society
Abstract: Observations of the ?quasi-two-day? wave are reviewed and it is concluded that the weight of evidence indicates that the wave is a solstical phenomenon, with maximum amplitudes in low latitudes of the summer mesosphere. ...
Zonally Symmetric Hough Modes and Meridional Circulations in the Middle Atmosphere
Publisher: American Meteorological Society
Abstract: The structure of the. meridional circulation driven by steady, zonally symmetric thermal or mechanical forcing is analyzed via the techniques of tidal theory. The relevant Hough functions are derived and, together with ...
Propagating Annular Modes: Empirical Orthogonal Functions, Principal Oscillation Patterns, and Time Scales
Publisher: American Meteorological Society
Abstract: he two leading empirical orthogonal functions (EOFs) of zonal-mean zonal wind describe north?south fluctuations, and intensification and narrowing, respectively, of the midlatitude jet. Under certain circumstances, these ...