I recently tried downloading and using portions of ERA5. However, it appears that ferret only recognizes ERA5 as a time series instead of as 4D data.
I have experimented a little bit with show grid and even setting a grid. This has revealed that while Showing the data suggests that there is data in 4 dimensions, showing the grid for one of the data variables shows that the grid is abstract and entirely in the T dimension.
Setting a grid then use(ing) the dataset seems to give it a grid structure, but when I try to list a subset of the dataset (doesn't allow me to list the whole dataset) the Lat-Long coordinate spaces on the grid don't seem to have data (the data points listed seem to only be listed with time).
I both tried downloading directly from the Copernicus Climate Data Store and importing the data into my Windows 10 bash Ubuntu which created a file with a .nc extension, and downloading the data using cdsapi (Climate Data Store Application Program Interface) to download it directly into my bash environment. The second method gave me product with a .netcdf extension. Except for some issues getting all the desired variables using the second method, both products acted identically in terms of the problem outlined above.
Thank you!
Alexander Audet