Add snow surface temperature parameterization #839
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Purpose
Calculate the snow surface temperature using surface boundary conditions.
To-do
[] Fix stability issues when Tsfc becomes small
Content
Instead of returning the snow bulk temperature as the snow surface temperature (Tsfc), Tsfc is solved for using the surface boundary conditions on the energy. A thin surface layer is used to address Tsfc > snow freezing temperature, where extra energy from “over-warming” the thin surface layer is added to the snow interior; SWE is conserved as the snow instantaneously melts into the interior snowpack.