Nutrient-enabled ALM-FATES (planning)

jenniferholm commented 7 years ago

Goal = develop a nutrient-enabled ALM-FATES model. Plan = Modularity between the ALM soil sub-models and the FATES vegetation. So the ALM big-leaf vegetation will not be invoked. Currently FATES only has carbon, and does not have any nutrient feedbacks between the soil and the vegetation. Additionally FATES only has two prognostic pools, leaf and 'alive', which essentially holds all the other vegetation pools.

See "FatesBGCDynMod.F90" for initial development of a module which creates a pathway to call the belowground biogeochemistry code as driven by the FATES vegetation model but bypassing the aboveground CN vegetation code. It is modeled after the CNDriverMod in its call sequence and functionality.

Initial steps to accomplish this issue, but feedback is requested - 1) Explicitly prognose all the 7 vegetation carbon pools. Leaf, fine root, alive coarse root, dead coarse root, alive stem, dead stem, storage. 1a) Develop prognostic allocation for these vegetation pools. Only the total 'alive' C pool has 'memory' right now. 2) Bring in ability for nutrients; N, P. 3) Develop the leaf level demand and constraints 4) Determine the root uptake and root C:N

Issue to consider =

Time steps. Currently FATES is daily, but the nutrient competition should be 30 minute. Do the nutrient uptake in 30 minutes, and put into the storage pool for daily resolution.
For allometry, consider using the Friendlingstein coefficients to scale from fine roots to the rest of the plant. (In FATES all the vegetation all vegetation dynamics are based off of allometry).

Inviting review and discussion on initial planning from @rgknox, @qzhu-lbl, @jinyuntang, @acme-y9s, @wjriley, @thorntonpe.

Simple workflow for nutrients in FATES.pptx

Review of litter classes in FATES.pptx

jenniferholm commented 3 years ago

@rljacob - it actually might be fine if this issue is closed, because nutrient cycling is now connected between ELM and FATES, the interfacing is in master, and lots of work has been done on this. So with regards to "planning" we're probably all good. The only hang-up is that planning and changes to nutrient-enabled ELM-FATES always takes work, ongoing, and can be such a long-lived activity, but still this issue is old and do you agree should be closed?
I could link the main PRs that summarize connecting nutrient cycling in ELM-FATES here, if you think that is useful, and then close?

rljacob commented 3 years ago

Sure list the PRs and close.

E3SM-Project / E3SM

Nutrient-enabled ALM-FATES (planning) #1773