1PT.urbanc_alpha streams needs to use QBOT Sa_shum in place of RH Sa_rh

[ekluzek]

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The 1PT.urbanc_alpha stream is currently trying to use RH on it's data file rather than QBOT. RH doesn't exist on the file, but QBOT does. Hence it fails when you try to run this way.

[ekluzek]

This is the reason for this problem in CTSM:

https://github.com/ESCOMP/CTSM/issues/2122