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Eddy-Induced Instability for Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: Synoptic eddy?mean flow interaction has been recognized as one of the key sources for extratropical low-frequency variability. In this paper, the underlying dynamics of this interaction are examined from the perspective ...
Intraseasonal Oscillations in the Extratropics: Hopf Bifurcation and Topographic Instabilities
Publisher: American Meteorological Society
Abstract: A potential vorticity model in a ?-channel is used to analyze the resonant response of equivalent-barotropic flow to topography in the presence of a forced zonal jet with arbitrary meridional structure. The nonlinear ...
Closures for Ensemble-Mean Linear Dynamics with Stochastic Basic Flows
Publisher: American Meteorological Society
Abstract: This paper demonstrates the validity of a second-order closure for the ensemble-mean dynamics using the approach of direct numerical ensemble simulations of a linear barotropic model with stochastic basic flows. For various ...
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part I: A Linear Closure
Publisher: American Meteorological Society
Abstract: The interaction between synoptic eddy and low-frequency flow (SELF) has been recognized for decades to play an important role in the dynamics of the low-frequency variability of the atmospheric circulation. In this three-part ...
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part III: Baroclinic Model Results
Publisher: American Meteorological Society
Abstract: In this three-part study, a linear closure has been developed for the synoptic eddy and low-frequency flow (SELF) interaction and demonstrated that internal dynamics plays an important role in generating the leading ...
Dynamics of Synoptic Eddy and Low-Frequency Flow Interaction. Part II: A Theory for Low-Frequency Modes
Publisher: American Meteorological Society
Abstract: Amidst stormy atmospheric circulation, there are prominent recurrent patterns of variability in the planetary circulation, such as the Antarctic Oscillation (AAO), Arctic Oscillation (AO) or North Atlantic Oscillation ...