 

Field
NODC 0700m heat content
Ocean Heat Content anomalies from WOA09 : heat_content_anomaly 0700 m seasonal 1.00 degree
X axis: whole world in 360 1.00° steps, first point at 179.50° W, last point at 179.50° E Y axis: regular grid with 180 1.00° steps, first point at 89.50° S, last point at 89.50° N Z at 0.00 Monthly data available from Feb1955 to Jan2019 ( 768 months) Variable h18_hc (ocean heat content anomaly 0700m) in 10^18_joules Full metadata. Construct a statistical forecast model from this field Compute anomalies
Compute zonal mean
If you really want to get it here, NODC 0700m heat content is available as a netcdf file (size 193.918 MB). 
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