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The 3-D fields can be either on model or on pressure levels.
Geophysical fields
Geophysical fields are time invariant fields describing surface properties like surface fraction (ocean, glacier, lakes, vegetation fractions), mountain height and several other fields.
To get a list of fields that need to get provided have a look at the following wiki: Geophysical fields
Schemes
Land surface scheme (ISBA, CLASS, SVS)
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