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2021 CTSM science meeting notes

May 20

Announcements

  • CESM Workshop. Registration still open for attendence.

Updates: FATES-SP, Rosie

  • FATES-SP mostly working with PR to FATES-main pending
  • CLM5-SP != CLM-FATES-SP: Fast gas exchange has diverged since 2012. (LUNA, Medlyn, acclimation, etc).
  • Unwinding these changes makes the models look more similar, but FATES also requires consideration of:
    • Crops
    • SAI bug
    • leaf layers & direct vs diffuse light
  • Long term, this raises questions about how we maintain the duplication / redundancies of photosynthesis code in CTSM and FATES.
    • How does the whole system work when you 'roll forward' the CTSM and FATES codes,
    • Especially when Big-Leaf is used for crops and FATES is used for natural vegetation?
    • Are we close enough to having an efficient FATES code that can replace the big leaf radiation scheme? This may require a big-leaf implementation in FATES.

Updates: Hillslope model, Sean

May 6

Announcements

Computing resources, are there community projects we should saving this for, or consider donating hours to CESM testing?

  • 8.4 million on LMWG Prod (93300041) 10/31
  • 2.4 million on LMWG Dev (93300641) 10/31
  • 2.7 million on TSS (08010000) 9/30

Obligations and Requests

  • 1M PPE for 1-at at time
  • 1M+ PPE for latin hypercube
  • Trendy (try running 0.5 degree?) & other MIP requests
  • Meg & climate process team
  • Claire & Abby, CAM-CLM perturbed simulations
  • Jackie, tropical FATES & Fire
  • 400k Sanjiv for high res.
  • 1.5M Peter for
  • 500k Andy Newman, CTSM high resolution calibration on NNA project.
  • 500k Andy Wood, CTSM and S2S predictions (if needed)
  • Polly Boutte, regional FATES simulations
  • Andy Fox & Xuli, Global DA on LAI
  • Danica, Crops & clouds AMIP runs
  • Rosie, FATES calibration efforts (2.5 M on CSL allocation)

April 22

Katie leads a discussion on ESDS goals which likely will include development of new python-based diagnostics packages for CESM component models.

Slides are here

  • This will be a bottom-up effort.
    • Funding / people / time spring to mind as issues
    • Maybe NCAR-NEON activity will be a good place to start!

Example projects for reference

LMWG opportunities

  • CTSM-py https://github.com/NCAR/ctsm_python_gallery,
    • A place to put sample workflows and tools that use CTSM model output
  • PPE-tools - Daniel Kennedy, Katie Dagon (under development)
    • Tools to support scripting and analysis of the CLM5 perturbed parameter ensemble (PPE)
  • NCAR-NEON
  • LMWG diagnostics?

April 15

CESM Workshop, Virtually 14 - 17 June 2021

  • LMWG 3.5 hours Tues. morning
  • Overview presentation (this is expected, helpful)?
  • Topical discussions centered on:
    • Disturbance and Management
      • Fire - Charlie Koven - probabilistic vs prognostic method of handling fire and impacts
      • Agriculture
    • Interactions and Feedbacks
      • Hillslope Hydrology
      • Mizuroute?
      • FATES-SP - priorities and progress, results?
      • NEON simulations
  • Series of <5 minute lightning talks (~6 talks per topic)
  • Coordination committee
    • Jackie, Rosie, Peter, Charlie, Negin, Sanjiv, Adrianna, Stefanie
  • Invited talks only? welcome poster presentations (some of which may be elevated to main session)
    • moderated discussion with guiding questions
    • single slide introduction to posters?

Energy closure issue, Martyn Clark

April 8

Bill and Danica lead a discussion on grid cell averaging

Link to slides from this discussion

Background

  • Sparked by discussion regarding history fields related to ozone code.
  • How does grid cell averaging (from subgrid, e.g., column or patch level, especially when a variable is not calculated on some land units)?
    • extensive vs. intensive quantities (gC/m2 vs. K)
  • How do users generate regional or global averages, especially with some fraction of a grid cells has land units w/ no values.
    • Should be weighted by fraction of grid cell that a quantity is calculated over
      • This is further complicated by LULCC, since fields are updated annually.
    • We don't currently provide the metadata to do this correctly or which fields should be used for each variable of interest.
    • Maybe use pct_nat_veg, pct_crop & other land units, but additional metadata are needed on history files for this to be done correctly.

How this is done in the code.

  • LOTS of different ways...
  • l2g_scale_type provides a way to do this for veg, crop, urban, ice, etc.
    • Bill seems to like this since it clarifies metadata associated with each variable.
    • Daniel asked if this could have veg_intensive and veg_extensive definitions to handle most of the history fields.
  • set_*, can be set to spval or 0. depending on if a quantity is included in averages or not.
    • Bill doesn't seem to like this
    • Erik also think this this should not be used
  • most history fields are typically set to spval, so they are not included in gridcell averages unless they are defined elsewhere.
  • Other variables are later set to zeros later in the code, which doesn't lend itself well to documentation in metadata.
  • Peter asked how we maintain backwards compatibility in old history files and how we do our analyses?
    • Bill thought this seemed more like a bug, if averaging was done incorrectly.
  • Katie asked what other modeling group do?
    • Dave noted this would be a great topic for the land model summit, if it ever happens.

Questions to consider moving forward

Is there an agreement on a path forward?
  • We need to add metadata to document how the field was averaged, as well as provide the landuse fractions so users can do what’s needed with it.
  • l2g_scale_type seems like a good way to do this, especially for new history fields.
  • Crops & urban seem like particular use cases that may deserve additional consideration.
How do we get there, at what priority?
  • It's somewhat daunting given the 1400 fields we can write out on history files.
  • Issue seems greater w/ biogeophysics (BGC seems OK?).
  • Write out l2g_scale_type metadata on history files.
    • Bill's still concerned this may be misleading based on set_* = spval, although we're we're explicitly setting l2g_scale_type this may be OK?
  • Dave suggested picking a small set of variable to do this correctly.
  • Possibly extend this to more commonly used variables used in analyses.
  • Also need to build in the tools so that analyses are done correctly (ESDS & CTSM_py activities).

March 25

Ronny Meier introduces project on roughness lengths for deciduous vegetation [#1316]((https://github.com/ESCOMP/CTSM/issues/1316)

March 11, 2021

LMWG discussion

  • Congratulations to Yue and Inne, 2021 Slater Award winners
  • Surprises, thoughts, or recollections?
  • Considerations for CESM Workshop: Panel based discussions around themes (e.g.):
  • Discussion questions before meeting
  • Series of lightening talks from (invited?) speakers:
  • Themes:
    • natural disturbance (fire, windthrow, drought)
    • management (managed forests, agriculture)
    • land-hydrology connections
    • land-atmosphere interactions

Updates on PPE and CTSM5.1 tag(s).

  • CTSM5.1.0 tag will also rename master to main

Discussion of CTSM5.1 simulations

Crowd Sourcing model diagnostics

  • do we pass the 'eye' test Dave, for Nate and ILAMB

Web page(s): Keith.

Feb 11, 2021

Simulating DOM fluxes in CTSM, Devaraju

Updates on PPE tag & state of CTSM5.1 simulations

Planned simulations with CTSM5.1

  • Land only big leaf & FATES reduced complexity modes.
    • Reduced complexity FATES needs to be integrated PR 1182.
    • For transient LULCC we need the raw LUH2 data brought in as streams files #1077.
  • CESM-FATES smoke test (waiting for FATES-SP + CESM2.2.beta02 tag)

LMWG meeting

Jan 28, 2021

Brainstorming ideas for land contributions to CESM2-LENS

  • Brainstorming JamBoard
  • Pages are organized to show:
    • Mature work (Keith and Ryohei's work at Pusan),  
    • Topics / analyses that are (relatively) developed,
    • Idea for additional analyses,
    • Additional Questions & Requests &  
    • A quick look at some data (very preliminary).
  • Please contribute ideas and thoughts to the JamBoard & contact Keith R. if interested in pursuing a topic in greater depth.

Jan 14, 2021

Updates

  • LMWG and BGCWG meetings Feb 23-25, 2021. https://www.cesm.ucar.edu/events/wg-meetings/2021/land.html
  • Biomass heat storage PR to CTSM5.1
    • Stocking density as new CLM5.1 parameter
    • FATES integration beginning
  • Community simulations of CESM2 with forcing from CESM1-LENS runs.
    • Investigate the relative role of forcing changes versus model structural changes in the differences between CESM2 CMIP6 runs and the CESM1-LENS runs.
    • Marika and Cecile are considering putting together an overview paper that describes these runs with a few key results.
    • Interest in contributing to paper or analyzing results?
  • CESM2-LENS simulations, discussion at 4 MST Jan 28.

Isla's findings on improved wintertime temperature variability

  • Update from Fall 2020, related to snow density!

WUE diagnostics

  • Daniel introduces different flavors and how to calculate them
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