Help Identifying the Physical Meaning of Model Inputs and Outputs

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I have reviewed the references that are supposed to describe the physical meaning of the model inputs and outputs/scalars, but I have not been able to identify this information clearly.

Could I get assistance identifying what the inputs physically represent and what the outputs/scalars physically represent?

Specifically, I would like to understand:

What physical quantities the input variables correspond to.
What physical quantities the output/scalar variables correspond to.
How to determine which input variable corresponds to which physical quantity.
How to determine which output/scalar variable corresponds to which physical quantity.

Any guidance on where this information is defined in the documentation, dataset, code, or associated references would be very helpful.

Start by reviewing the existing references and documentation, then trace the input, output, and scalar variables through the dataset and Python code. Identify where each variable-to-quantity mapping is defined or missing, and document the physical meanings and how to determine each correspondence.

Written by the indexing model from the issue text.