debug NaNs in 4 year longrun

[juliasloan25]

In #908, we ran the global snowy land model for 4 years. This resulted in some NaNs in a few regions, namely western Canada, Patagonia, southern Greenland, and coastal Antarctica (see plots below). We need to investigate why these come up and fix the model before we can couple the full land model with atmos.

To Do

• run regional simulations of these areas with frequent output to determine which variable first becomes NaN

Plots from 4 year longrun

These plots render too small in Github to see the NaNs, but zooming in will show where the NaNs appear.