Tuesday 25 September 2012

Madden-Julian Oscillation

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.[1][2] Rather than being a standing pattern (like ENSO) it is a traveling pattern, propagating eastwards at approximately 4 to 8 m/s, through the atmosphere above the warm parts of the Indian and Pacific oceans. This overall circulation pattern manifests itself in various ways, most clearly as anomalousrainfall. This was discovered by Roland Madden and Paul Julian.

The MJO affects the intra-seasonal variations in Indian summer monsoon and is very important area of study. 

This MJO was mentioned in Yojana issue on 'Monsoon'.

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