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RISThe Statistical Properties of a Zonal Jet in a Baroclinic Atmosphere: A Semilinear Approach. Part I: Quasi-geostrophic, Two-Layer Model Atmosphere
Publisher: American Meteorological Society
Abstract: A semilinear (the wave-dynamics are linear with the time-evolution operator determined by the time-varying zonal flow while the zonal flow is fully nonlinear in the eddy fluxes) model of a baroclinic zonal jet is integrated, ...
Local Multiple Equilibria and Regional Atmospheric Blocking
Publisher: American Meteorological Society
Abstract: Stationary flow of a barotropic fluid in a ? channel has been shown by Charney and De Vore (1979) to possess multiple-equilibrium solutions when sinusoidal topographic forcing is exerted within the region of resonance near ...
Forced Coherent Structures and Local Multiple Equilibria in a Barotropic Atmosphere
Publisher: American Meteorological Society
Abstract: We consider the response of the barotropic vorticity equation on a zonally infinite f-plane or beta-plane to a weak localized vorticity source accompanied by weak Ekman damping. By performing an expansion about the unforced, ...
Further Developments of Normal Mode Theory of Lee Cyclogenesis: Isentropic Coordinate Model
Publisher: American Meteorological Society
Abstract: This work is an extension of the normal mode theory of lee cyclogenesis in that it removes all the simplifications and restrictive assumptions contained in previous formulations Linearized primitive equations in isentropic ...
Effects of Finite Height Topography on Nongeostrophic Baroclinic Instability: Implications to Theories of Lee Cyclogenesis
Publisher: American Meteorological Society
Abstract: Baroclinic instability in the presence of steep finite amplitude topography is studied in the primitive equation model. The quasi-geostrophic theory of Alpine cyclogenesis of Speranza et al. is reanalyzed and discussed in ...
Orographically Induced Cyclogenesis: Analysis of Numerical Experiments
Publisher: American Meteorological Society
Abstract: Cyclogenesis induced by an isolated mountain chain in a baroclinic flow is simulated in a channel version of the HIBU (Mesinger-Janji?) primitive equation model. The main features characteristic of cyclogenesis in the Ice ...
Coupling between the Atmospheric Circulation and the Ocean Wave Field: An Idealized Case
Publisher: American Meteorological Society
Abstract: This work studies the two-way coupling between the atmospheric circulation and the ocean surface wave field, as it is described by the recent observations and theories on the dependence of the sea surface roughness on the ...
Nonlinear Amplification of Stationary Rossby Waves Near Resonance. Part I.
Publisher: American Meteorological Society
Abstract: The authors search the stationary solutions of the barotropic vorticity equation in spherical coordinates by numerically solving the equations with the Newton?Keller pseudoarclength continuation method. The solutions consist ...
Nonlinear Amplification of Stationary Rossby Waves near Resonance. Part II
Publisher: American Meteorological Society
Abstract: In a preceding paper the authors showed that planetary waves of very different amplitudes can be sustained on the same configuration of the zonal wind by asymptotically balancing the energy contributions related to Ekman ...
A Theory of Deep Cyclogenesis in the Lee of the Alps. Part I: Modifications of Baroclinic Instability by Localized Topography
Publisher: American Meteorological Society
Abstract: Observational and numerical studies on Alpine cyclogenesis have shown that a developing baroclinic wave approaching the mountain region gives rise to a disturbance of dipolar structure, extending throughout the troposphere ...