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WhatsNewInCTSM5.3.md

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What's new in CTSM 5.3 (tag ctsm5.3.0)

Purpose and description of changes since CTSM 5.2 (tag ctsm5.2.005)

  • Adds CN Matrix method to speed up spinup for the BGC model.
  • Updates surface datasets.
  • Brings in new Leung 2023 dust emissions.
  • Adds explicit air conditioning for the urban model.
  • Updates crop calendars.
  • Updates fire model with various improvements, including default parameterization against climate reanalysis from CRU-JRA instead of GSWP.
  • FATES compsets can now be run with transient land use.

These changes were needed ahead of the CESM3 capability/functionality "chill". For clm6_0 physics these options are now turned on by default, in addition to Sturm snow and excess ice.

Changes to CTSM infrastructure

  • manage_externals removed and replaced by git-fleximod
  • Ability to handle CAM7 in LND_TUNING_MODE

Changes to CTSM answers

Changes to defaults for clm6_0 physics:

  • Urban explicit A/C turned on
  • Snow thermal conductivity method is now Sturm_1997
  • New initial conditions file for f09 ("1-degree") 1850, with more in progress
  • New crop calendars
  • Dust emissions method is now Leung_2023
  • Excess ice is turned on
  • Updates to MEGAN for BVOCs
  • Updates to BGC fire method

Changes for all physics versions:

  • Parameter files updated
  • FATES parameter file updated
  • Glacier region 1 is now undefined
  • Update in FATES transient land use
  • Pass active glacier (CISM) runoff directly to river model (MOSART)
  • Add the option for using Matrix CN method for Carbon/Nitrogen BGC spinup

New surface datasets

  • With new surface datasets the following GLC fields have region "1" set to UNSET: glacier_region_behavior, glacier_region_melt_behavior, glacier_region_ice_runoff_behavior
  • Updates to allow creating transient landuse timeseries files going back to 1700.
  • Fix an important bug on soil fields that was there since ctsm5.2.0. This has the side effect of mksurfdata_esmf now giving identical answers with a change in number of processors, as it should.
  • Surface datasets now provided for the ne0np4.POLARCAP.ne30x4 grid.
  • Surface datasets now have their version number embedded to prevent mismatch of surface dataset and CTSM version.
  • Remove the --hires_pft option from mksurfdata_esmf as we don't have the datasets for it.
  • Remove VIC fields from surface datasets.
  • Updates to input datasets in PFT/LAI/soil-color raw datasets (now from the TRENDY2024 timeseries that ends in 2023), as well as two fire datasets (crop fire peak month, peatland fraction), and the glacier behavior dataset.