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Meeting Notes 2022 Science

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2022 CTSM science meeting notes

Sept 22

Updates and Announcements

  • Welcome:

  • Wins & successes:

    • Congratulations Dave, new interim CGD director!
    • Land Model Summit was excellent, as is the CTSM + FATES science and community.

Steve Raciti, visiting Boulder from Hofstra University, shares about his N deposition work.

If time allows:

  • Discussion on ET fluxes from CESM2 deforestation experiment.

Sept 8

Updates and Announcements

  • Welcome: Mahjabeen (Mim) Rahman, others?

  • Wins & successes: Peter's going to COP27 in Egypt as part of the NCAR delegation!

Elin Aas' updates on MIMICS+

Sept 1

Updates and Announcements

  • Welcome:

  • Wins & successes:

    • Dave and Danica were able to meet with Sarah Ruth and others at NSF
    • No new babies yet...

CESM academy

  • Monthly engagement with CESM community
  • short, focused trainings to compliment larger tutorials
  • Brian asked if we'd like a CTSM focused session?

Negative runoff

Aug 25

Updates and Announcements

  • Welcome:
    • Many visitors!
  • Wins & successes:
    • CESM tutorial! Kudos to Peter and thanks to everyone who helped / presented
    • Jackie's fire paper in PNAS.

Danny Leung

  • Dust updates

James King

  • CESM2 LULCC ensemble

Aug 11

Updates and Announcements

  • Welcome:
    • Hyunyoung
    • Others?
  • Wins & successes:
    • Flux Course success! Danica, Negin, Gordon, Katya, Brian and Will had 1 day tutorial at Mountain Research Station building on the CTSM-mini tutorial and NEON examples.
    • NEON project receiving 1 year extension.

July 28

Updates and Announcements

  • Welcome:
    • Finley & Donovan
    • Others?
  • Wins & successes:
    • Adrianna's review paper submitted!
    • More?

Bash script to easily submit a chain of CESM jobs, Sam R.

  • submit_chain.sh in my git repo here
  • build out for more support (e.g. Keith's Run historical .csh script)?

CSL allocation

May 19

Updates and Announcements

  • Welcome:
  • Wins & successes
    • LEAP SE and postdoc to join NCAR (Columbia hire)
    • Gordon and Keith spotted in the ML!
    • Will, Daniel, Flavio, Isla & others have CESM2-LE paper on snow and runoff accepted to PNAS.
  • SE updates
    • cdeps bug means that zbot is not read in for single point tower simulations that use nuopc (note, this not an issue with mct).

CESM workshop

  • June 13-16, virtual
  • Register now! Presentation request due by May 23
  • LMWG highlights requested for Gokhan and Will's presentations

CTSM mini-tutorial [Will, Adrianna, Negin, Brian, & Danica]

May 5

Updates and Announcements

  • Welcome:
  • Wins & successes
    • CESM-Lab running in AWS.
  • SE updates
    • Ending support for mct within weeks to a month
    • Discussion of tutorial on github workflow for project development.

CTSM mini-tutorial [Will, Adrianna, Negin, & Danica]

  • May 25-26, 9-12 MDT
  • 60 participants registered
  • Running with CESM-Lab in the cloud (Amazon Web Service)
  • Hoping to build a library of tutorials for a variety of users / features.
  • Beta-testers needed
  • Agenda + presentations
  • Proposing to make learning pods of students in zoom breakout rooms

Stability parameterization in roughness length PR [Keith & Gordon]

April 21

Updates and Announcements

  • Welcome:

  • Wins & successes

  • CTSM Mini-Tutorial: Virtual May 25-26

    • 55 registrants
    • Tutorial materials coming together, will use CESM-Lab & Cloud

  • CESM Workshop: Virtual June 13-16

    • Registration opens Monday
    • LMWG morning of June 14
    • Special format for this year's workshop?

  • SE updates

    • Support for mct & coupler 7 will be phasing out in next months as CESM components move to nuopc (cmeps & cdeps)
      • Several features like regional cases, additional datm options (CRUJRA & anomaly forcing) need to migrate to nupoc.
      • Additionally workflows may need updating (.csh scripts for historical simulations)
    • alpha_CTSM5.2_mksrf001* tags should only be used for High resolution, variable grid, special use cases requiring new mksrfdata & dataset capabilities

Emma Hauser presents on flexible stoichiometry

Ashehad Ali shares grass-cast results

April 7

Discussion on enthalpy fluxes in CTSM

Background

  • New ocean model (MOM) keeps track of enthalpy fluxes, or the advective heat flux, from the heat content of water crossing ocean boundaries.
  • Ideal (long term solution) all components keep track of enthalpy associated with mass exchanged across components. This seems like a big task!
  • Short term could be to use an ad hoc fix for fluxes to/from the ocean.

CTSM notes

  • CTSM has no concept of enthalpy now
  • Example from Marcos & Ryans 2019 ED2.2 paper,
    • Add enthalpy flux from percolation, throughfall & canopy dripping, runoff, evaporation, etc to latent heat flux.
  • A simpler approach must track mass and temperature of water fluxes between atmosphere and land
  • CTSM currently not tracking energy associated with precipitation (currently that energy stays in the atmosphere)
  • Determining temperature of water mass flux would be dependent (e.g. temperature of vegetation, soil water, snow temperature, Canopy temperature may be most difficult).
  • Temperature changes associated with water movement between parts of CSTM are not accounted for (e.g., transfers of energy with soil water movement).
  • A robust physical solution may be challenging. Can we find a minimal solution for what to do with enthalpy flux received from atmosphere (pass heat flux to deep soils or immediately route this the rivers / oceans)?
  • CAM is ~1 year out from passing enthalpy fluxes to land.
  • Current fixes proposed for MOM-CAM are a good enough start for CESM3.
  • Working on this in stand-alone mode, assigning enthalpy from temperature associated with precipitation.
  • Need to decide how to handle internal enthalpy fluxes (as well as water leaving leaving the land).

Note that Keith and Dave L had a followup meeting with Peter Lauritzen and others to talk about whether or not simple ways to implement enthalpy flux could be considered in land in near-term. Keith and Dave discussed afterwards and see challenges. Here is summary of our conversation:

Option 1: An energy flux term, calculated in the coupler based on TBOT and the mass of precipitation, is sent to the land model.

We were thinking about accounting for this energy flux by adding it to the ground heat flux in the land model. But, unless we are missing something, this flux would always be positive, at least for rain - whether it is warm or cold rain. So, this would always warm the top soil layer, which I don't think is what would happen in the real world. Seems like at the very least, you would need to consider the temperature of the top soil layer vs the temperature of TBOT to calculate whether or not the energy flux into the soil should be positive or negative. Not really sure how or whether it makes sense to do that, but even if you did do that we started to realize that regardless, you probably need to account for the enthalpy flux from soil layer 1 to soil layer 2. And, you would need to account for the enthalpy flux associated with plant transpiration. Presuming you could calculate the mean temperature of the water lost through transpiration, where would that flux be accounted for.

Option 2: Pass the temperature of the precipitating water to the land

In this option (ignoring challenges associated with canopy interception and surface runoff), we would update the soil temperature of layer 1 by calculating the mass-weighted average temperature of the soil/soil-water with that of the precipitating water that infiltrates into the soil. That would at least give the intuitive result that precipitation that is colder than the soil temperature would cool the soil and precipitation that is warmer than the soil would warm the soil. But, I think there is the same question about what happens with the transpiration (or soil evaporation) water. And, the fact that we aren't tracking the transfer of heat as water filters down into the soil is also likely a problem (though maybe (???) one we can live with).

If we could resolve this overarching question about how to deal with the enthalpy flux associated with evaporation, then there are a host of other challenges related to runoff (surface and subsurface), canopy interception, land surface type heterogeneity, etc, that we might be able to sort out ... but might not.

We are not really sure how to proceed. We were talking ourselves into pretzels trying to figure this out. One thing that might be a little bit helpful (not sure if it WILL be helpful or not) would be a more detailed explanation of what is or will be happening over the ocean. How exactly with the precipitation enthalpy flux and the evaporation enthalpy flux be handled for the ocean. Maybe with that information, we will have better understanding.

So, we intend to keep talking about this, maybe with a slightly larger group of land people. We are concerned that our pretzel conversation (only partially captured with the above) might have gone off the rails and that we are missing something simple. But, the outcome of our conversation is that without moving to an enthalpy-centered formulation of the model, it may be quite difficult to implement even a kludgy fix, though we are still open to more ideas coming in.

March 31

Updates and Announcements

  • CTSM tutorial, virtual May 25-26.
    • In the cloud with CESM-Lab

Rong Li presents on SIF formulation for CLM.

March 10

Updates and Announcements

  • Welcome:
    • Emma Hauser, Univ of MT
  • Wins & successes
    • NSF and NCAR leadership are talking about continuing support for NCAR-NEON work.
  • SE updates
    • Any history on coarse root respiration fluxes as part of soil respiration, (#1676)?

New datasets for CTSM5.2

  • Roadmap of current and proposed data & workflow.
  • Identify new datasets, people involved, and github issues for CTSM5.2. This includes:
    • Updating old datasets (soil properties) &
    • Bringing in new ones (e.g. Urban, dust and roughness, etc)
  • We'll build on this worksheet from Peter.

Additional considerations,

  • Potential complications and changes related to dataset and surface data creation, especially related to mksurfdata_esmf, #1674

Feb 24

Updates and Announcements

  • Welcome:

    • Amy Liu
    • Others

  • Wins & successes

    • Big participation at LMWG.
    • Congratulations to Claire and Yifan, winners of the Slater award.

  • SE updates

    • Sam and Erik brought MIMICS onto main.
    • Negin brought subset data tag to main.
    • Bill's making a ton of tags today.

  • LMWG comments, suggestions, thoughts, issues?

Suggested change the structure of crop yield outputs

  • Sam started this issue #1649

Jan 26

Updates and Announcements

  • Wins & successes:
    • Lots of FATES discussions following our last meeting that we'll continue today!
  • SE updates?
    • Negin and Adrianna are closing in on a workflow for creating single point cases... stay tuned!
  • LWMG agenda, moderators, etc.

CTSM-FATES

Let's remember what's ongoing in TSS

  • Regional applications, Jackie
  • Point simulations with NEON, Adrianna
  • Hillslope - FATES integration, Jackie, Sean, Adrianna?
  • Land use data sets for transient simulations, Peter.
  • FATES wannabes, Katya, Will & others

New in 2022 Global FATES

Coupled Case

  • Marysa ran CAM6-CLM5%FATES case

  • Keith found Coupled FATES-SP only 5% slower than big leaf-SP (* Abby noted caveat here since it was a short run and cohorts were )

    • Do we need to better understand (or improve) cost estimates with different configurations?
    • Dave asked for a simulation with a spun up land state that can be used in a coupled simulation
    • Rosie suggested this be done with fixed biogeography configuration (with competition).

  • Keith will spin up a fix biogeography FATES case to

    • Qunatify timing costs, both for land only and coupled cases.
    • Try this with AD spinup and then postAD to test ILAMB comparisons
    • Keith asked about what variables you need to check for equilibrium?
    • Polly noted that stand structure doesn't necessarily come into in equilibrium even though veg biomass does.
    • Need to write out FATES_AGB, number of plants by size class and pft
    • Charlie asked if this should be done coupler history, but Dave doesn't think this is needed.

  • Additional FATES resources from Jackie:

    • This list is helpful for all namelist changes are needed for different configuration.
    • FATES wiki has a bunch of material that could be summarized into a searchable users guide
    • FATES also have this FAQ page

Land only runs

  • Dave ran a land only FATES SP and noComp cases

    • ILAMB results
    • Dave noted "this shows that we can run ILAMB on FATES, but nocomp run started from cold start and ran 3 years, so it isn't at all meaningful"
    • Ryan, Adrianna noted that FATES GPP is only for natural veg land units.
    • Charlie noted there are additional complexes to consider re. FATES output to HLM.
    • Are there other considerations for integrating results into ILAMB or Diagnostics?

  • Keith ran a historical case without LULCC for CTSM5.1_SP vs. CTSM_FATES_SP

    • FATES was 15% slower than big leaf
    • Noted big difference in albedo, among other changes...
    • Diagnostics
    • ILAMB

Rosie suggested the following differences may be responsible for FATES-SP and Bigleaf-SP cases

  1. Differences in Vcmax (from LUNA in CLM5.1, parameterized directly in FATES).
  2. Daylength adjustment (on in CLM5 off in FATES)
  3. Stomatal conductance ( Medlyn in CLM5, BB in FATES)
  4. Vcmax Acclimation (on in CLM5, not in FATES)
  5. TPU limitation (on in CLM5, off in FATES)
  6. Smoothing (on in CLM5, off in FATES)
  7. PHS (on in CLM5 off in FATES)
  8. Leaf Optical Properties (which changed in CLM5.1?), Jackie has an update for this.
  9. Leaf layering and level thickness in FATES
  • names list controls in FATES are being over written, but this isn't reflected on lnd_in file (e.g. medlyn vs. bb conductance)
  • LAI still not the same for FATES since crops aren't being considered in FATES

Jan 13

Updates and Announcements

  • Welcome Zhonghua, Danielle
  • Wins & successes?
  • SE updates?

Breakout rooms & discussion

LMWG Jan 31-Feb 4

  • 50 talk requests, > 115 registered! (2021 meeting = 35 talks in 3 days).
  • Are we offering the Slater Award (Dave)?
  • Suggestions for how to increase 2-way communication?
    • networking opportunities (coffee or lunch breaks),
    • talk guidelines &
    • discussions or breakout sessions
  • Volunteers for chairs, moderators [Rosie (PM), Abby, Adrianna, Pete, Ryan, Jackie, Charlie, Polly, Negin]

CLM / LWMG priorities

  • We've been talking about FATES and Hillslope being the future of CTSM for YEARS, but it's been slow going.
  • How do we accelerate the use of these tools & better support the community?
    • Identify gaps, pinch points
    • Run global coupled SP case
    • Scientifically supported global SP compset
    • Workflow distinct for global, regional & point cases.
    • Analysis scripts needed with examples of how to get back big-leaf variables from FATES output.
    • Afraid, ask Rosie, or at least see her notes
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