Madden-Julian oscillation
Overview
 
The Madden–Julian oscillation (MJO) is the largest element of the intraseasonal (30–90 days) variability in the tropical atmosphere. It is a large-scale coupling between atmospheric circulation and tropical deep convection
Deep convection
Deep convection is a convective process in a medium, usually in an atmosphere or ocean, that in some sense spans the vertical.Within the atmosphere, this means from the surface to above the 500 hPa level, generally stopping at or defining the tropopause at around 200 hPa...

 http://www.agu.org/pubs/crossref/2005/2004RG000158.shtml http://envam1.env.uea.ac.uk/mjo.html.
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