New allometry option for storage

[mpaiao]

New option for storage allometry.

Description:

This is a minor an optional revision of the storage allometry. If fates_allom_stmode=2, then storage allometry will be proportional to the untrimmed leaf biomass, as a way to make the potential non-structural carbon accumulation to be scaled with the maximum leaf biomass given the PFT size.

Collaborators:

Expectation of Answer Changes:

Simulations using the default fates_allom_stmode=1 should not generate different answers.

Checklist:

• My change requires a change to the documentation.
• I have updated the in-code documentation .AND. (the technical note .OR. the wiki) accordingly.
• I have read the CONTRIBUTING document.
• FATES PASS/FAIL regression tests were run
• If answers were expected to change, evaluation was performed and provided

Test Results:

CTSM (or) E3SM (specify which) test hash-tag:

CTSM (or) E3SM (specify which) baseline hash-tag:

FATES baseline hash-tag:

Test Output:

[ckoven]

@mpaiao this looks great! I had forgotten that we had even put in a switch for multiple storage allometries, so using it as you do here is great. Curious how this changes model behavior for the cases where you use allom_stmode=2?

[glemieux]

I confirmed that I could build and run a simple single site case after turning on the new stmode in the parameter file. Regression tests are currently running on cheyenne.

[glemieux]

Regression testing on Cheyenne is complete. All expected tests are b4b against fates-sci.1.61.0_api.25.0.0-ctsm5.1.dev115.