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History variable attributes

Each variable in a history output file from an E3SM component should have the following attributes.

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cell_methods = “time: point” for instantaneous values. Other possibilities are in http://cfconventions.org/Data/cf-conventions/cf-conventions-1.8/cf-conventions.html#appendix-cell-methods

Do not worry about spatial cell_method for spatial averaging a variable because CF only defines those for rectangular structured grids.

Restart global attribute

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