All variables in variables.ini should be given a vert_type

[lewisblake]

Is your feature request related to a problem? Please describe.
The vert_type attribute of a species is a fundamental attribute needed when creating an experiment. However, pyaerocom has no native way of representing this metadata. It is assumed that this metadata is provided in a config though the obs_vert_type argument which is given to an instance of ObsEntry. If no observations are provided (i.e., I just want to plot model data), then this information is not available because ModelEntry has no such attribute (It has no variable information and therefore no place to put it). I propose that in variables.ini we provide each variable a default vert_type which can be used in cases where the attribute obs_vert_type is not available.

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Additional context
Related to wanting to show just model data.

[jgriesfeller]

Sounds reasonable to me. But keep it changeable.

[heikoklein]

Please state what you need the vert_types for. Column-variables need to be strictly distinct in the definition since they have different units than in-situ, so this differentiation makes sense. Measurement in different model-layers will have the same units as Surface, so it does not make sense.