"ERA5 reanalysis, https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5"
X axis: whole world in 1280 0.28° steps, first point at 0.00° E, last point at 359.72° E
Y axis: Gaussian grid with 640 steps, first point at 89.78° N, last point at 89.78° S
Z at 50000.00 Pa air_pressure
1-daily data available from 01Jan2008 to 30Sep2018 ( 3934 times)
Variable z500 (Geopotential Height) in m2 s-2
Full metadata. The associated land/sea mask is available for some operations

Get grid points, average area or generate subset

Mask:	no mask mask3.txt   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average max min set of grid points subset of the field
Considering:	everything land points sea points show/hide more only land points only sea points not land points not sea points
Units:	convert to m leave in m2 s-2

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) biannual seasonal monthly 10-daily 5-daily
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of Z500
Threshold:	no cut less than greater than m2 s-2 percentile normal 1971-2000
Minimum:	% valid data
First apply:	-day running mean
Missing data:	ignore, climatology, trend, persistence.

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

Construct a statistical forecast model from this field

Contains modified Copernicus Climate Change Service information. Please read and agree to the Copernicus license before downloading.

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 5581.22 MB).