Abstract: A single baroclinic normal mode is perturbed by small orography. The method of analysis considered here allows one to conceptually, understand how the orography modifies the characteristics of the normal mode, and how the ...

Abstract: No abstract available

Abstract: The linear evolution of arbitrarily specified perturbations in a zonally homogeneous, two-layer model is analyzed in a dynamical system which describes the disturbances in terms of the phase difference and amplitude ratio ...

Abstract: Transition of weather regimes is examined in a highly simplified model. Two completely distinct internal methods of transition are identified. The first is a synoptically triggered large-scale instability, while the second ...

Abstract: An objective break criterion is utilized to investigate the manner in which the slowly varying component of the atmosphere ( 10-90 day frequency band) actually varies. It is found that a great deal of the behavior appears ...

Abstract: The climate drift of various quantities associated with deep, planetary-scale, equilibrated, transient Rossby waves are estimated for the Southern Hemisphere extratropical summer as revealed by the DERF II (Dynamical ...

Abstract: Systematically recurrent, geographically fixed weather regimes forced by a single isolated mountain in a two-layer, high-resolution, quasigeostrophic model modified for the sphere are found to be robust phenomena. While ...

Abstract: We hypothesize that periods of quasi-stationary behavior in the large scales are integrally associated with an organized behavior of the synoptic scales, thus the terminology ?weather regime.? To investigate our hypothesis, ...