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Analysis of Tropical–Extratropical Interactions with Influence Functions of a Barotropic Model
Publisher: American Meteorological Society
Abstract: Influence functions (IFs) of a linear barotropic vorticity equation model are computed in order to determine the regions in which anomalous divergence at upper levels, related to tropical heating anomalies, has the largest ...
Response of Planetary Waves to Stationary Tropical Heating in a Global Atmosphere with Meridional and Vertical Shear
Publisher: American Meteorological Society
Abstract: The response of planetary waves to stationary tropical heating in a stratified global atmosphere linearized with respect to a basic zonal mean flow is investigated. The basic zonal wind has meridional and vertical shear. ...
Simulations of the Summer Circulation over the South American Region with an Eta Coordinate Model
Publisher: American Meteorological Society
Abstract: A multilevel limited-area primitive equations model in eta coordinate is used to simulate the effects of the Amazonian latent heat source and the Andean topography on the summer (December, January, February) circulation ...
Resonant Wave Interactions in the Presence of a Diurnally Varying Heat Source
Publisher: American Meteorological Society
Abstract: Resonant interactions among equatorial waves in the presence of a diurnally varying heat source are studied in the context of the diabatic version of the equatorial ?-plane primitive equations for a motionless, hydrostatic, ...
Large-Scale Response of the Tropical Atmosphere to Transient Convection
Publisher: American Meteorological Society
Abstract: We consider the problem of the linear response of a stratified, equatorial, ?-plane model atmosphere to specified transient sources of heat and momentum. The method of solution involves transforms in all three spatial ...
Diurnally Forced Tropical Tropospheric Circulation over South America
Publisher: American Meteorological Society
Abstract: The impact of diurnally varying thermal forcing on the tropical circulation is studied with a linearized shallow water model on an equatorial beta plane. The mass and flow fields are interpreted as an internal mode with ...
A Spectral Cumulus Parameterization for Use in Numerical Models of the Tropical Atmosphere
Publisher: American Meteorological Society
Abstract: The spectral cumulus parameterization theory of Arakawa and Schubert is presented in the convective flux form as opposed to the original detrainment form. This flux form is more convenient for use in numerical prediction ...
Excitation Mechanism of Mixed Rossby–Gravity Waves in the Equatorial Atmosphere: Role of the Nonlinear Interactions among Equatorial Waves
Publisher: American Meteorological Society
Abstract: One possible explanation for the relatively high signal of the mixed Rossby?gravity waves observed in the tropical atmosphere is explored in this paper. This explanation is based on the nonlinear interactions among equatorial ...
Multiscale Atmosphere–Ocean Interactions and the Low-Frequency Variability in the Equatorial Region
Publisher: American Meteorological Society
Abstract: AbstractIn the present study a simplified multiscale atmosphere?ocean coupled model for the tropical interactions among synoptic, intraseasonal, and interannual scales is developed. Two nonlinear equatorial ?-plane ...
Resonant Wave Interactions in the Equatorial Waveguide
Publisher: American Meteorological Society
Abstract: Weakly nonlinear interactions among equatorial waves have been explored in this paper using the adiabatic version of the equatorial ?-plane primitive equations in isobaric coordinates. Assuming rigid lid vertical boundary ...