"ERA5 reanalysis, https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5" averaged over 2x 2 grid boxes
X axis: whole world in 720 0.50° steps,
first point at 0.12° E, last point at 359.62° E
Y axis: regular grid with 360 -0.50° steps,
first point at 89.88° N, last point at 89.62° S
Monthly data available from Jan1979 to Dec2020 ( 504 months)
Variable z500 (monthly mean of daily Geopotential Height) in m2 s-2
Construct a statistical forecast model from this field
Contains modified Copernicus Climate Change Service information.
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Please consider downloading this field from the authoritative site.
If you really want to get it here,
ERA5 z500 is available as
a netcdf file (size 349.273 MB).