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2026 Software Engineering meeting notes
Gregory Lemieux edited this page Apr 20, 2026
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- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CTSM6 Code freeze status (5 min)
- Calibration progress update
Integrated
Testing
Under Review
Updates
New
Latest issues and discussions of note
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CTSM6 Code freeze status (5 min)
- Calibration progress update
- Sam R: Presentation to NOAA about agentic coding
-
CISL: Tuesday May 05, derecho
- Sam R: this is moving to May 12-13
- NERSC: Wednesday May 20, perlmutter
-
FATES modeling meeting
- April 23: Cancelled
- May 7: Junyan Ding, COMPASS FATES-hydro work
-
Transatlantic coordination meeting setup
- Purpose: discuss future plans for FATES API changes. Coordination focus (e.g. avoid cherry-picking)
- Poll feedback
- Sam: Would be ideal to have date x time matrix selection. Note NCAR can't use when2meet due to malware in ads
Integrated
- Update LUH missing value checks (#1555), ctsm5.4.033: Update FATES tag with fix for LUH no_nan data set issue (ESCOMP/ctsm#3926)
Testing
- ctsm5.4.034: bug fix to the FATES land use driver input code (ESCOMP/ctsm#3902)
- new LUPF variables (cherry-picked mirror of NorESMhub) (#1548): Charlie made suggestions noting duplicates
Under Review
-
Complete the FATES-CLM nitrogen coupling (#1472)
- Complete the FATES-CLM nitrogen coupling (ESCOMP/ctsm#3409)
- Greg: Move this to testing or more review? Note that Sam Levis has been running build/run tests
- Sam R to add review
- Will: should this have testing beyond the regression testing?
- Discuss this within context of queue at CTSM SE meeting on Thursday as well as how to conduct future answer changing tests for ctsm-fates in the future.
Updates
-
Update FATES tag to API 44 (E3SM-Project/E3SM#8278): added landuse transition option (#1489), land use no nan data sets (#1555), fates restart issue fix (ctsm#3940)
- Merge fixed order of LUxPFT matrix read (#E3SM-Project/E3SM#8259) into #8278 if above is B4B during testing
- Split initial density into to parameters with a switch on HLM side (#1550): CTSM SE focused discussion last week has majority in support of brining this in
New
Latest issues and discussions of note
- Cold-starting full-FATES, options (#1559): Discussion shows interest in enabling this capability. Discuss with absent members next week as well.
- deferred
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- Poll results
- FATES-CLM6 Code freeze status (5 min)
- Calibration progress update
- FATES modeling meeting: April 23, TBD
Integrated
New
-
Update LUH missing value checks (#1555): B4B results against pre-intel compiler update
- Charlie: recommend keeping the old logic as well to provide backwards compat with folks who might be using the NaN
_FillValueland use data sets- Ryan: Note that
isnandoesn't always work; Recommending checking that the value matches itself.
- Ryan: Note that
- Ryan: Historically we don't do logic tests against floats.
- ctsm5.4.033: Update FATES tag with fix for LUH no_nan data set issue (ESCOMP/ctsm#3926)
- Update FATES tag to API 44 (E3SM-Project/E3SM#8278)
- Charlie: recommend keeping the old logic as well to provide backwards compat with folks who might be using the NaN
- fixed order of LUxPFT matrix read (#E3SM-Project/E3SM#8259)
Under Review
-
Update Grazing Logic (cherry-picked mirror of NorESMHub 55) (#1547): Question to Rosie on status of last comment
- Is the NorESM team not implementing the recent commits?
- If so, should the main fates branch mirror that fact (i.e. should we revert those updates)?
- Charlie is ok with going whichever way that Rosie wants to go.
- Action: change paranthesis to match previous logic
- If so, should the main fates branch mirror that fact (i.e. should we revert those updates)?
- Is the NorESM team not implementing the recent commits?
-
new LUPF variables (cherry-picked mirror of NorESMhub) (#1548): Charlie made suggestions noting duplicates
- Ryan to review
Updates
-
Split initial density into to parameters with a switch on HLM side (#1550)
- add new fates namelist switch for dbh init when nocomp is on (ctsm#3910)
- Ryan to work up alternate version of this
-
Complete the FATES-CLM nitrogen coupling (#1472): bring this in for fates-maintenance?
- Rosie: the sooner this comes into NorESM, the better.
Latest issues and discussions of note
- error in land use driver data in land use x PFT data (#1551)
- LUH
NaNissues (see above new PRs): #1552 with children #1553, #1554 - FYI: not reproducible at year boundary (NorESMhub/NorESM#790): coupled restart issue
- Full support for update sci tag to 2.0.0
- no updates
- Rosie: Bringing MIMICS plus to FATES
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (5 min)
- Calibration progress update
- FATES modeling meeting: April 9, Zachary Robbins
- Improving Scientific Software conference: April 6-9
- CTSM SE meeting impacted
Integrated
-
Updates to land use clearing logic (#1489)
- ctsm5.4.030: Add a FATES namelist option for land use transition logic (ctsm#3728): minor build update and re-test
New
- Add guidance on the use of AI contributions (#1549)
- Split initial density into to parameters with a switch on HLM side (#1550)
Under Review
- Update Grazing Logic (cherry-picked mirror of NorESMHub 55) (#1547)
- new LUPF variables (cherry-picked mirror of NorESMhub) (#1548)
Latest issues and discussions of note
- No new issues or discussions
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- Latest issues (5 min)
- Calibration progress update
- FATES modeling meeting: March 12: Performance Improvements (Ryan)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- Debrief from LMWG Meeting
- Calibration progress update
- FATES-CLM6 Code freeze status (5 min)
- Speed Refactor Updates
- FATES modeling meeting: March 12: TBD
New
Integrated
- Frozen Hydro Mort Fix (#1533)
- E3SM JSON API (7954)
- Adding some more land-use-change and globally-relevant history variables (#1485)
Testing
- Damage Loop Escape (1532)
- LU Super PR
- Nitrogen Coupling (#1472): Reproducing ERS restart failure.
Updates/Reviewing
Discussing
Latest issues and discussions of note
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- Speed Refactor Overview
- Calibration progress update
- FATES-CLM6 Code freeze status (5 min)
- FATES modeling meeting: 26 February: TBD
- CLM Land Model Working Group meeting: 24-26 February
Integrated
Testing
- NEXT: frozen soil mortality
- Adding some more land-use-change and globally-relevant history variables (#1485) - Need Sam R approval
-
JSON formatted FATES parameters: ready for review, tested on pm-cpu
- Get this into the integration queue ASAP so we can see how regression tests work out across other machines
- Needs rebasing against master after #7899 integrated
Updates/Reviewing
- Add some biophysical variables (#1407)
- Refactor boundary condition interface structure (#1477)
- Damage Loop Escape (1532)
Discussing
New -add area and biomass history variables indexed by landuse x pft #1535
Latest issues and discussions of note
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (5 min)
- Calibration progress update
- FATES modeling meeting: 12 February: TBD (likely office hours)
- CLM Land Model Working Group meeting: 24-26 February
Integrated
Testing
- Adding some more land-use-change and globally-relevant history variables (#1485) - Need Sam R approval
-
JSON formatted FATES parameters: ready for review, tested on pm-cpu
- Get this into the integration queue ASAP so we can see how regression tests work out across other machines
- Needs rebasing against master after #7899 integrated
- Refactor boundary condition interface structure (#1477): ready for review, tests are (near) B4B
Updates/Reviewing
Discussing
New
Latest issues and discussions of note
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (5 min)
- Outputs for CMOR and simulations
- Calibration progress update
- FATES modeling meeting: 12 February: TBD (likely office hours)
- CLM Land Model Working Group meeting: 24-26 February
Integrated
- Updates to FATES zenith angles on the first step of non-continue restarts (E3SM#7899): waiting to be integrated
Testing
-
Testing Framework Update (#1519): Greg to finish this
- Adrianna to update the code to convert CDL to NetCDF.
- Greg to check in end of day. It's ok to just move forward with uploading the netcdf file.
- Adrianna to update the code to convert CDL to NetCDF.
Updates
-
JSON formatted FATES parameters: ready for review, tested on pm-cpu
- Get this into the integration queue ASAP so we can see how regression tests work out across other machines
- Needs rebasing against master after #7899 integrated
- Refactor boundary condition interface structure (#1477): ready for review, tests are (near) B4B
New
- direct usage of parameter datastructure - allometry proof of concept
-
Add a FATES namelist option for land use transition logic #3728
- Coupled with Updates to land use clearing logic (#1489)
- Keep the parameter file update, Jessie to update to JSON format, provide B4B values for new param in comments of the PR
- Coupled with Updates to land use clearing logic (#1489)
Latest issues and discussions of note
-
CLM-FATES results in odd global forest patterns when hydro is on (#1527)
- Marcos meeting with Steven on Thursday to discuss this more
- Charlie: Soil texture or temperature initial condition wrt. Simple check, initialize soils to saturated and check.
- Marcos: Difference in pedotransfer between ELM and CLM?
- Will: Maybe surface dataset differences?
- relevant discussion below
-
NorESM CTSM issue #188
- Rosie: Is CTSM going through this?
- Will: Yes, bringing in Sam Levis who has been working on this
- Charlie to reply in thread to remaining issues we didn't get to today
- Rosie: Is CTSM going through this?
- Lack of very big trees in the boreal region email thread (Adrianna, Rosie, Jessica)
- AGB allometry parameters seem to have the greatest impact on creating large trees (reducing too many little trees)
- GPP increased faster (wider DBH -> more leaves)
- AGB allometry parameters seem to have the greatest impact on creating large trees (reducing too many little trees)
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (1 min)
- Calibration progress update
- FATES modeling meeting:
- CLM Land Model Working Group meeting: 24-26 February
- Will: Request for presentations open until the 06 February. Note this year is a CuPID tutorial.
- Will asked Rosie to give a talk about NorESM. Adrianna will give a talk. Would be good to get FATES overview talk like previous years.
- Adrianna: We should hold a hackathon to get FATES output variables into CuPID
- Will: Request for presentations open until the 06 February. Note this year is a CuPID tutorial.
Integrated
- changes for NorESM nocomp simulation efforts #1510 Testing
- Updates to FATES zenith angles on the first step of non-continue restarts (E3SM#7899)
Latest issues and discussions of note
- Will: Matvey has a number of PRs that address bugfixes
Canceled due to federal holiday
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (1 min)
- Calibration progress update
- FATES modeling meeting: 15 January: Office hours
- CLM Land Model Working Group meeting: 24-26 February
- Will: Request for presentations open until the 06 February. Note this year is a CuPID tutorial.
- Will asked Rosie to give a talk about NorESM. Adrianna will give a talk. Would be good to get FATES overview talk like previous years.
- Adrianna: We should hold a hackathon to get FATES output variables into CuPID
- Will: Request for presentations open until the 06 February. Note this year is a CuPID tutorial.
Integrated
Testing
- changes for NorESM nocomp simulation efforts #1510: Waiting on computing account top up
-
Updates to FATES zenith angles on the first step of non-continue restarts (E3SM#7899): Reviewing unexpected DIFFs
- Greg and Ryan think they've ID'd a fix.
Latest issues and discussions of note
- Will: Matvey has a number of PRs that address bugfixes
- no updates
- Wins (1 min)
- Machine status and meeting notices (5 min)
- Upcoming Meetings (5 min)
- PR board status (10 min)
- Latest issues (5 min)
- FATES-CLM6 Code freeze status (1 min)
- Greg: nutrients test in BC refactor now B4B
- FATES modeling meeting: 15 January: TBD
- NGEE-Arctic All-Hands: 12-13 January
Integrated
Review
-
changes for NorESM nocomp simulation efforts #1510
- Ryan: Ryan is creating a patch file for holding the nocomp negative init density runs. Rosie can use this to update with the nocomp calibration values.
Needs Reviews
- Unit Fix to Smoothed NPP used for free living fixation: Greg to review toda
Updates
- Nitrogen Coupling (#1472): Ryan and Sam continued to meet
- Updates to FATES zenith angles on the first step of non-continue restarts (E3SM#7899): Greg to test
New
-
Testing Framework Update (#1519)
- Walkthrough
- New script:
generate_empty_testsets up boilerplate stuff for new test development- See templates directory
- Same top line scripts for running tests
- Improved readme with test build walkthrough example
- Put tests in the
configfile when creating new ones - Tests actually live in
testing/tests/<test_type> -
frameworkis where the python testing infrastructure lives- Expanded classes for different test types
-
builderis responsible for compiling everything
- New script:
- Walkthrough
Latest issues and discussions of note
- Create release github branch (#1520): task issue for the FATES-CLM6 freeze (see below)
- Greg: Release tag deadline for ctsm still in flux
- #1510 is likely the last stuff that will need to come in to make a release
- NorESM freeze is imminent
- #1510 is likely the last stuff that will need to come in to make a release
- Discussion of boreal forest LAI issue
- MODIS LAI is much lower than fates
- Charlie: do we need to improve the canopy snow interception model (to adjust LAI due to snow occlusion)
- Ryan: two-stream model does account for snow occlusion, but are we passing this information to the HLM?
- Adrianna: working on c4 grass calibration
2026 Software Engineering Meeting Notes
2025 Software Engineering Meeting Notes
2024 Software Engineering Meeting Notes
2023 Software Engineering Meeting Notes
2022 Software Engineering Meeting Notes
2021 Software Engineering Meeting Notes
FATES API and Host Land Model compatibility table
Relevant References page (User's Guide)
Moorcroft et al. 2001. Ecological Monographs, 74:557-586.