Noah Interp Flux From Coarse

[AMLattanzi]

Summary

For lev>0, the land surface model will interpolate the fluxes from level 0. This allows creation of a fine patch from the coarse data without a wrfinput file.

Challenges

• Noah returns values of -9999 when the landmask is not 1 and these values are are mapped to lsm_undefined . The interpolation will pick up these values and smear them in the fine array; this effectively biases our fluxes to large values. To alleviate this issue, the surface layer now writes the iterated flux back into the noah flux data structure when an undefined value is encountered.
• Interpolate and handle the data arrays for RRTMGP as well.

Testing

• Tornado with a static region of refinement of 3 3 1 over the small domain region.

Changes

The writing of iterated fluxes into the noah structure will change regression tests because the iterated flux will now be held constant until the next noah call since it is a valid value after the overwrite. In effect, the iterations over invalid land cells will be updated at the same frequency that Noah MP is updated (rather than each step).