Abstract
Abstract The purpose of this study is to examine the characteristics of equatorial waves identified in simulated atmospheric data by an NCAR global circulation model. The technique of wavenumber-frequency spectral analysis is applied for the time-sequence data at grid points around the latitude circles. Three types of dominant waves are identified by spectral peaks and phases: the atmospheric Kelvin waves, the mixed Rossby-gravity wave, and the Rossby-Haurwitz type of free oscillation. The Rossby-Haurwitz type of free oscillation is at zonal wavenumber 1 with a westward-propagating period of about 5 days. There is no vertical phase tilt for this oscillation. The Kelvin waves are found at wavenumber 1 with an eastward-traveling period of about 24 days and wavenumber 2 with an eastward-traveling period of about 12 days, while the mixed Rossby-gravity wave is found at zonal wavenumber 3 with a westward-traveling period of about 4.61 days. Both types of vertically-propagating waves have a vertical wavelength ...
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