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Baroclinic Instability at Short Wavelengths in Vertically Discrete Quasi-Geostrophic and Ageostrophic Models
Publisher: American Meteorological Society
Abstract: Short wavelength linear baroclinic instability is examined numerically in two quasi-geostrophic models and one ageostrophic model. The growth rate spectra for the ageostrophic model differ little from those of the ...
Baroclinic Instability and Isentropic Slope
Publisher: American Meteorological Society
Abstract: The wavelength of maximum baroclinic instability (WMI), maximum growth rate (MGR), phase velocities, and other quantities, are computed for an atmosphere with an internal 100-mb layer having various shears and lapse rates ...
Baroclinic Instability in the Upper Troposphere
Publisher: American Meteorological Society
Abstract: Observations show that the lapse rate increases upward in the troposphere. Baroclinic instability spectra are presented for the lapse rate increasing linearly upward from small values in the lower troposphere to large ...
Ageostrophic Subsynoptic-Scale Baroclinic Instability
Publisher: American Meteorological Society
Abstract: The discrete-level baroclinic eigenproblem developed by Satyamurty et al., based on a Boussinesq primitive equation model, is solved by a shooting method for very high vertical resolution. It is found that the vertical ...
Boundary-Layer Damping of Baroclinic Instability
Publisher: American Meteorological Society
Abstract: A shooting method is applied to a 100-level perturbation model with an explicit Ekman layer. Growth rates for a no-slip boundary condition are similar to those found previously. It is noted that the large cross-isobaric ...
A Partial Theory of the 26-Month Oscillation of the Zonal Wind in the Equatorial Stratosphere
Publisher: American Meteorological Society
Abstract: Attempted explanations of the 26-month zonal wind oscillation in the equatorial stratosphere are critically examined. Explanations in terms of subharmonic response, ?vacillation,? or a resonant mode are rejected. Some ...
AN EVALUATION OF CERTAIN FORMS OF MOMENTUM TRANSFER IN THE 26-MONTH OSCILLATION
Publisher: American Meteorological Society
Abstract: The fundamental equations are linearized by the method of small perturbations for the conditions of hydrostatic equilibrium and geostrophic balance of meridional forces. In a first case, Fickian momentum diffusion is used; ...
The Adiabatic Lapse Rate in the Venus Atmosphere
Publisher: American Meteorological Society
Abstract: The adiabatic lapse rate is derived for a real gas, and the result applied to the Venus atmosphere, which is assumed to consist of pure CO2. The ratio of the real to the ideal gas adiabatic lapse rate is found to exceed ...
Climatology of Sr-90 in Surface Air: A Simple Model using Diffusion and Scavenging
Publisher: American Meteorological Society
Abstract: The evolution of Sr-90 distribution following an instantaneous stratospheric or tropospheric source in an annulus defined by latitude walls is investigated by means of a very simple model that uses 12 stratospheric and 12 ...