Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber-frequency domain

From: Journal of the Atmospheric Sciences | Date: February 1, 1999| Author: | Copyright information

ABSTRACT

A wavenumber-frequency spectrum analysis is performed for all longitudes in the domain 15 deg S-15 deg N using a long (~18 years) twice-daily record of satellite-observed outgoing longwave radiation (OLR), a good proxy for deep tropical convection. The broad nature of the spectru m is red in both zonal wavenumber and frequency. By removing an estimated background spectrum, numerous statistically significant spectral peaks are isolated. Some of the peaks correspond quite well to the dispersion relations of the equatorially trapped wave modes of shallow water theory with implied ...

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