What are the variables to be morphed related solar radiation from TMY file to generate future TMY? and What GCM variables to be used from AR5?

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I would like to perform energyplus simulations using generated future TMY's. There are around 10 variables in AR5 related to solar radiation and energyplus uses 3 solar variables from TMY to perform simulations. I am confused as to which variable of GCM to be used and which variable of TMY to be morphed.