There is strong variability in MJO activity from year to year. There are long periods of strong activity followed by periods in which the oscillation is weak or absent.
This interannual variability of the MJO is partly linked to the ENSO cycle!!
In the Pacific, strong MJO activity is often observed 6 – 12 months prior to the onset of an El Niño episode, but is virtually absent during the maxima of some El Niño episodes.
MJO activity is typically greater during a La Niña episode. Strong events in the Madden–Julian oscillation over a series of months in the western Pacific can speed the development of an El Niño or La Niña but usually do not in themselves lead to the onset of a warm or cold ENSO event.
The westerly surface winds associated with active MJO convection are stronger during advancement toward El Niño and the easterly surface winds associated with the suppressed convective phase are stronger during advancement toward La Nina.
But it is not the MJO that creates El Niño and La Niña, there is only a correlation between the ENSO and the the status of the Niñas!?
Read more about how NOAA follows the MJO activity to help them in the forecasting
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