Transient response to localized episodic heating in the tropics

Details Transient response to localized episodic heating in the tropics Transient response to localized episodic heating in the tropics

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icsu...18t....s&link_type=abstract

In International Council of Scientific Unions Handbook for MAP, Vol. 18 8 p (SEE N86-27719 18-46)

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Convective Heat Transfer, Equatorial Atmosphere, Equatorial Regions, Planetary Waves, Satellite Imagery, Stratosphere, Synchronous Satellites, Tropical Meteorology, Amazon Region (South America), Congo (Brazzaville), Indonesia

Scientific paper

It is generally recognized that equatorial disturbances in the lower stratosphere are excited by convective latent heat release associated with the Internal Tropical Convergence Zone (ITCZ). Recently, attention has also focused on tropical convection with regard to extratropical teleconnection patterns. Unlike equatorial waves which are trapped about the equator but propagate vertically, the latter extend well out of the tropics but are barotropic. They have been most widely discussed in connection with long-term climatological features. Both types of disturbances have been examined largely from the standpoint of steady monochromatic forcing, in the latter case zero frequency or time-mean heating. However, tropical convection as revealed by recent geostationary satellite imagery is anything but regular, surely not steady. Much of the heating variance is concentrated spatially within three localized convective centers: Indonesia, the Amazon, and the Congo. Convective activity within these regions undergoes an irregular evolution over the span of a couple of days. It involves a rather broad spectrum of spatial and temporal scales. The analysis of cloud brightness over the Eastern Atlantic and Africa suggests a characteristic time scale of 3-4 days and correlations scales in latitude and longitude of approximately 30 deg.

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