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An Investigation of the Lunar Semidiurnal Tide in the Atmosphere
Publisher: American Meteorological Society
Abstract: Surface observations of the lunar semidiurnal tidal oscillations in geopotential height (at equator: amplitude ≈65 cm, phase lag ≈3O min), temperature (at Batavia: amplitude ≈0.008 K, phase lag ≈46 min), and wind (at ...
Selective Excitation of Tropical Atmospheric Waves in Wave-CISK: The Effect of Vertical Wind Shear
Publisher: American Meteorological Society
Abstract: The growth of waves and the generation of potential energy in wave-CISK require unstable waves to tilt with height oppositely to their direction of propagation. This makes the structures and instability properties of these ...
Effects of the Mean Walker Circulations on the Zonal Variability of Tropical CISK Waves
Publisher: American Meteorological Society
Abstract: An idealized zonally asymmetric mean state in the Tropics is used to investigate the effects of atmospheric mean Walker circulations and sea surface temperatures on the zonal variability of tropical waves with positive- ...
Generalization of the Effect of Vertical Shear of Mean Zonal Flow on Tropical CISK-Wave Excitation
Publisher: American Meteorological Society
Abstract: This paper investigates the effects of vertical shear of the mean zonal flow on CISK waves in a spherical geometry. A linearized primitive equation model, including mean zonal flow, on a sphere is designed to generalize ...
The Roles of the Hadley Circulation and Downward Control in Tropical Upwelling
Publisher: American Meteorological Society
Abstract: Several idealized models of tropical upwelling are presented in order to clarify the roles of the nonlinear Hadley circulation and extratropical wave driving. In particular, it is shown that the Hadley circulation and ...
Simulations of the Interannual Variability of Stratospheric Water Vapor
Publisher: American Meteorological Society
Abstract: Observations and model results indicate that the quasi-biennial oscillation (QBO) modulation of stratospheric water vapor results from two causes. Dynamical redistribution of water vapor from the QBO-induced mean meridional ...
Planetary Wave Coupling between the Troposphere and the Middle Atmosphere as a Possible Sun-Weather Mechanism
Publisher: American Meteorological Society
Abstract: The possibility of planetary wave coupling between the troposphere and solar-induced alterations in the upper atmosphere providing a viable mechanism for giving rise to sun-weather relationships is investigated. Some of ...
Utilization of Normal Mode Initial Conditions for Detecting Errors in the Dynamics Part of Primitive Equation Global Models
Publisher: American Meteorological Society
Abstract: When a global atmospheric basic state has constant angular velocity and its temperature varies with attitude only, there exist normal mode solutions to the linearized global primitive equations. The use of these normal ...