In my last post, which was about the Mauna Loa Observatory (MLO) in Hawaii, Dr. Richard Keen and others noted that for a good comparison, there was a need to remove the variations due to El Nino. Dr. Keen said that he uses the Multivariate ENSO Index (MEI) for such removal.
And what is the MEI when it is at home? Here’s the description from NOAA:
El Niño/Southern Oscillation (ENSO) is the most important coupled ocean-atmosphere phenomenon to cause global climate variability on interannual time scales. Here we attempt to monitor ENSO by basing the Multivariate ENSO Index (MEI) on the six main observed variables over the tropical Pacific. These six variables are:
sea-level pressure (P),
zonal (U) and
meridional (V) components of the surface wind,
sea surface temperature (S),
surface air temperature (A),
and total cloudiness fraction of the sky (C).
Now me, I’m a bit wary of…
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