EOF of geopotential height anomalies of 500 hPa

This computes the climatological anomalies of 500 hPa geopotential height, then calculates the EOFs using NCL's eofunc.
The code is in NCL and requires model input: 1) monthly averaged surface pressure (ps), 2) monthly averaged geopotential height (zg)

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EOF of geopotenitial height anomalies for 500 hPa CM4_historical_LONG OBS
North Atlantic plot plot
North Pacific plot plot