Solitary Rossby waves in the lower tropical troposphere

Abstract

Weakly nonlinear approximation is used to study the theoretical comportment of large-scale disturbances around the inter-tropical mid-tropospheric jet. We show here that the Korteweg de Vries (KdV) theory is appropriated to describe the structure of the streamlines around the African easterly jet (AEJ) region. The introduction of the additional velocity C1 permits to search the stage where the configuration of the wave will correspond in this zone to those of Rossby solitary waves. It was also shown that the configurations of disturbances can be influenced by this parameter so that we can look if the disturbances are in the control or not of their dispersive effects.

Keywords: Soliton; Rossby waves; KdV equation; African easterly waves