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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, ...
Statistical Properties of Low-Frequency Variability in the Northern Hemisphere
Publisher: American Meteorological Society
Abstract: We discuss some statistical properties of the observed tropospheric circulation in Northern Hemisphere mid-latitudes. The data used consist of the twice-daily 500 mb height NMC analyses for the period 1966?77. Our analysis ...
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 ...
Orographic Instability of Nonsymmetric Baroclinic Flows and Nonpropagating Planetary Waves
Publisher: American Meteorological Society
Abstract: The theory of the baroclinic instability of a nonsymmetric basic state in the presence of shallow sinusoidal topography is analyzed. The limiting case of vanishing topography (instability of a baroclinic Rossby wave) is ...
A Theory of Deep Cyclogenesis in the Lee of the Alps. Part II: Effects of Finite Topographic Slope and Height
Publisher: American Meteorological Society
Abstract: The theory of cyclogenesis in the lee of the Alps presented by Speranza et al. in Part I is reexamined here (Part II) in the context of models dealing with finite amplitude topography. This generalization leads to the ...
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 ...
Instabilities of a Baroclinic Flow Related to Topographic Forcing
Publisher: American Meteorological Society
Abstract: The presence of bottom topography in a baroclinic flow modifies the properties of the propagating baroclinic unstable modes and allows for the appearance of new unstable modes which are nonpropagating, as first shown by ...
A Minimal Baroclinic Model for the Statistical Properties of Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: A recent analysis of atmospheric observations has shown evidence of bimodality in the statistical distribution of wave amplitude in the ultralong (zonal wavenumber group 2?4), low frequency (period >5 days). Similar analysis ...
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 ...