PPE change to sa_leaf in CanopyFluxesMod.F90

[olyson]

Description of changes

Add change to sa_leaf that was in PPE branch but is not on master

Specific notes

Contributors other than yourself, if any: @olyson

CTSM Issues Fixed (include github issue #):
Fixes #2777

Are answers expected to change (and if so in what way)? Yes. See #2777 for results.

Any User Interface Changes (namelist or namelist defaults changes)? No

Does this create a need to change or add documentation? Did you do so? Yes. No.

Testing performed, if any:
No test suite testing thus far.

[slevis-lmwg]

@olyson found this line missing from the recent PPE code that came to master. That recent code came in as b4b, while the modification here changes answers. Keith already evaluated the effect of this modification in #2777.

To me it seems a good idea to merge this quickly.

[samsrabin]

@wwieder Removing my assignment, as with the change to our queue order I no longer care when this comes in ;-)

[slevis-lmwg]

Starting aux_clm.

[olyson]

I think "larger than roundoff/same climate" is adequate, and maybe not put "X" in the checkboxes? Unless "significant" means the same thing as "larger than rounoff/same climate". I interpret significant as meaning different climate, which is not what I think we have here. Also, I suggest maybe include a direct link to the diagnostics, instead of indirectly through the issue?

[slevis-lmwg]

I have preemptively updated the ChangeLog with aux_clm results.
Izumi is done and came back OK.
Derecho is in progress and looks promising this far.