Kd/debug permafrost

[kmdeck]

Purpose

We have too much permafrost in our models, and this seems to be affecting runoff. The surface runoff is much too high in high northern latitudes where permafrost is present.

If this is the case, the snow is not insulating the soil well enough, or the snow temp is problematic.

This PR adds a free parameter (replacing a hardcoded parameter) which controls the snow conductance at the bottom of the snowpack. This in combination with the snow surface temp parameterization from Andy may help with the permafrost problem

White area is permafrost in the model not present in the data:

Surface runoff bias (red = overprediction by model)

To-do

Content

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• I have read and checked the items on the review checklist.