Meeting Notes 2025 Science - ESCOMP/CTSM GitHub Wiki

2025 CTSM science meeting notes

Oct 16

Updates and Announcements (10 minutes)

  • Welcome:

  • Wins:

  • Announcements:

    • CESM mini tutorial @ AGU Wednesday December 17th, 1-4:30pm CST.
    • CESM3 Town Hall @ AGU, Thursday, December 18th, 1-2pm CST
    • Earth System Predictability Across Timescales (ESPAT) requests participation in Land-Atm interactions subgroups (Meg's email). Would it make sense to coordinate TSS representation? Subgroups: Metrics, Ag, Extremes, Reg Refined Sims, Diurnal Cycle of Precip, Coordinated Experiments. Intro slides linked

Jinmu Luo shares update on his work on soil N cycling

Will Wieder and the SE team present plans to have a release and development branch for CLM.

Oct 9

Updates and Announcements (10 minutes)

  • Welcome:

    • Jinmu Luo, visiting Boulder from Cornell

  • Wins:

    • Streamflow paper using CESM2-LE published by Jibin Joseph, Sanjiv Kumar & others (see below)
    • CTSM 5.4 initial conditions finished, minor version tag coming soon

  • Announcements:

    • Land Model and Biogeochemistry WG meetings Feb 24-26, 2026
    • CTSM5.4 surface datasets missing generic crop information (affects SP runs) see CTSM issue #3529

Variability in peak stream flow trends across the United States (20 Minutes)

  • Jibin & Sanjiv present their paper published in Nature Communications

C4 photosynthesis in CLM (30 minutes)

  • Rachel Hallmark shares initial findings

Sept 11

Updates and Announcements (10 minutes)

  • Welcome:

    • Huiqi Wang

  • Wins:

  • Announcements:

    • Land Model and Biogeochemistry WG meetings Feb 24-26, 2026

Data (software) nugget (10 minutes)

  • Sam Rabin shares his parameter modification script

CLM6 updates (40 minutes)

  • Will, Linnia, Sam R & others share where we are with the latest CLM6 updates
  • evolving slide deck

Aug 21

Updates and Announcements (10 minutes)

  • Welcome:

  • Wins:

    • PPE calibration #115 look amazing!
    • Land Diagnostics Framework (LDF) merged into CUPiD. Thanks Teagan, Sam L, & ADF team.

  • Announcements:

    • Land Model and Biogeochemistry WG meetings, suggested Feb 24-26
      • Considering CUPiD tutorial or documentation blitz

Aman Shrestha presents on Integrated Mississippi Modeling work (20 minutes)

Linnia shares the latest PPE calibration work(30 minutes).

  • If time allows, discuss plans for CTSM5.4 tag.

Aug 14

Updates and Announcements (10 minutes)

  • Welcome:

  • Wins:

    • Daniel & the PPE team published the CLM5.1 OAAT paper in JAMES.
    • Samar led a NASA proposal that's been deemed 'selectable' for funding, if funds become available by early next year.

  • Announcements:

Data nugget (10 minutes)

  • Erik introduces software struggle survey.
  • Please take a minute to take the survey

Adrianna Shares TRENDY2025 results (40 minutes each)

Aug 7

Updates and Announcements (10 minutes)

  • Welcome:
  • Wins:
  • Announcements:

Data nugget (10 minutes)

  • Quick look at LDF plots that will be enabled with CUPiD.

Steven De Hertog shares ideas for peatlands in CLM-FATES.

July 24

Updates and Announcements (10 minutes)

  • Welcome:
  • Wins:
  • Announcements:

Data nuggets (~15 minutes each)

  • Will with questions on winter snowmelt and freezing soils.
  • Linnia shares ideas for rescuing soil C stocks, now that we don't have overly productive forests
  • Sean presents on an initial implementation to enable for spatially distributed parameters in CLM and asks what parameters should we be tuning?

July 17

Updates and Announcements (10 minutes)

  • Welcome:

    • Max Bouman (DLR)
    • Sudhanshu Kumar (LEAP momentum fellow, PhD student, Auburn)
    • Sarah Ryu (LEAP REU, Berkeley)
    • Isabella Lu (LEAP REU, Columbia)
    • Will Selvidge (CSU)
    • Kyle Nardi (ASP postdoc)

  • Wins:

  • Announcements: History files for time averaged vs. instantaneous fields are now separate h0a vs. h0i, as of ctsm5.3.062. Thanks Sam L

Data nugget (10 minutes)

  • Kyle Nardi shares on a project about an AR driven rain-on-snow event that triggered flooding in Glacier National Park.

Presentation and Discussion (40 minutes)

  • Lei Zhao shares CLM Urban model updates

June 19

  • No meeting to recognize Juneteenth holiday

June 12

  • No meeting CESM workshop

May 29

  • no meeting Documentation hackathon

May 22

Updates and Announcements (10 minutes)

  • Welcome:

  • Wins:

    • Will ran a cloud-based CTSM tutorial for the EMBER BII in Idaho, thanks to Brian Dobbins (CGD) and Nick Cote (CISL) for setting up this up. This is a resource that's available for the community!
    • Keith and Sam L have an updated ILAMB installation that's available on Casper.
    • Katie and Will contributed to synthesis effort led by Kat Georgiou on soil C saturation in Global Change Biology.

  • Announcements:

    • HPC down week of June 2 see daily bulletin post
    • Documentation Hackathon next week, organized by Sam R w/ invite to follow
    • CESM Workshop agenda posted, Please register if you haven't already
    • 30th Annual Workshop Celebration - Tuesday, June 10th at 3:30 pm, in person and online, available to anyone even if they are not attending the workshop. Registration required.

Data Nugget (10 minutes)

  • Results from 5.4 Datasets

PPE updates (40 minutes)

  • Slides here
  • What are the other metrics we should be considering as we evaluate parameter suggestions from the PPE?

May 15

Updates and Announcements (10 minutes)

  • Welcome:

    • Fang Li is back!
    • Yifan Cheng visiting ACOM and CGD from UIUC

  • Wins:

    • LDF PRs from Meg and Naoki enable regional plots and calculating climatologies that != full time series
    • CTSM5.4 datasets look good (CTSM_dev issue, Diags & ILAMB. We'll talk more about this next week.

  • Announcements:

    • CESM Workshop agenda should be posted soon. Please register if you haven't already

Data Nugget (10 minutes)

Aya Lahlou will share on her phenology ML work that she's doing as part of LEAP. (40 minutes)

April 24

  • quick check in to plan upcoming simulations for CTSM5.4 datasets

April 17

Updates and Announcements (10 minutes)

  • Welcome:

    • Aya Lalou
    • Maoya Bassiouni

  • Wins:

    • Adrien's paper on Sturm snow thermal properties published
    • Jinmu Luo ran a full historical case with his NO3 changes with the latest CTSM dev tag.
    • CESM3 simulation #147 hasn't had a Lab Sea freeze, working on Greenland melt bias.
    • Peter (nearly) has data processed for CMIP7 land use getting us ready for CTSM5.4 minor release tag.
    • Land Diagnostics Code Fest was both fun and productive with four PRs opened and two merged. Thanks to everyone who joined.

  • Announcements

Data Nugget (10 minutes)

PPE updates & discussion (40 minutes)

April 10

  • no meeting, Land Diagnostics Codefest scheduled instead

March 27

Updates and Announcements (5 minutes)

  • Welcome:

  • Wins:

    • CRUJRA datm option (tag CTSM5.3.032)

  • Announcement:

    • June ESPAT Workshop is open, focusing on land-atmosphere interactions and their role on S2S predictability. Please join if interested
    • Land Diagnostics Codefest (Thurs April 10, 1:00-4:30 Mountain?)
      • Introduce, familiarize, improve the Land Diagnostics Framework.
      • Please reply to the calendar invite if you're interested in contributing.

Data nugget (15 minutes)

  • Sam Rabin shares update on crop model parameterization.

CESM Potpourri

Discussion about land related issues, biases, features in CESM development

March 13

Updates and Announcements (5 minutes)

Data Nugget & Discussion (30 minutes+)

  • Sean illustrates new flexibility in handling PFT definitions

March 6

Updates and Announcements (5 minutes)

  • Welcome:

  • Wins:

  • Announcements:

Data nugget (5 minutes, Will)

  • PFT plots (h1) from unstructured grid are simple!

Science and SE Roadmap for our next 3 months:

slides

Feb 6

Updates and Announcements (10 minutes)

ISIMIP (< 20 minutes)

Latest land only parameterization (30 minutes)

Jan 16

Updates and Announcements (10 minutes)

  • Welcome:

    • Ben Buchovecky @ Univ of WA
    • Shuyue Li @ Univ of ID

  • Wins:

    • Guoqiang send off gathering tonight at S. Sun
    • Regridding ne30 output to f09 grid using tools developed by Marit at NorESM. Thanks Rosie!
    • Yifan's paper using CTSM in RASM over Alaska published in JGR-A

  • Announcements:

Data nugget (10 minutes)

  • Sam Levis: time updates in latest CTSM5.3 tags & what it means for your workflows (preliminary)
  • Slides on google drive

Amy Liu (& UW team)

  • Photosynthesis response to perturbed Medlyn slope parameter in land-only and land-atm runs

Jan 9

Updates and Announcements (10 minutes)

Data nugget (10 minutes)

Latest simulations & diagnostics (40 minutes)

See issues and discussion on:

Slides to share