An improved model of the equatorial troposphere and its coupling with the stratosphere

Abstract

The Wind-Induced Sea-Air Heat Exchange (WISHE) Model of the 30-60-day oscillation developed by Emanuel is improved by adding downdrafts to the representation of convection and by coupling the troposphere to a passive stratosphere into which equatorial waves may propagate. The presence of the stratosphere is shown to have a profound effect on the unstable tropospheric modes. As the upward group velocity is larger for smaller zonal wavelengths, short waves in the troposphere are strongly damped and the most unstable mode shifts to low wavenumbers. -from Authors