[ncl-talk] Remove Global mean SST from the SST data

[dickson mbigi]

Dear concerned expert,
I am preparing a script to perfom  decadal MAM EOF over Indian oceans using
ERSSTV5 data set.
Steps prior to do EOF:
1) Select the three months of March-May and do the seasonal mean;
2) Do a 9-year running average (Lanczos filter)
3) Do the linear regression on the global mean SST and keep the residual
for latter EOF analysis (i.e. remove the global mean component at each grid
point).

I cannot figure out the third step on how to remove the global mean
component at each grid point.

Kindly I am writing to ask for any assistance or directive regarding the
said concern.

Regards,
Dickson.
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