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WhatsNewInCTSM5.3.md

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Purpose and description of changes since ctsm5.2.005

Bring in updates needed for the CESM3.0 science capability/functionality "chill". Most importantly bringing in: CN Matrix to speed up spinup for the BGC model, updated surface datasets, updated Leung 2023 dust emissions, explicit Air Conditioning for the Urban model, updates to crop calendars. For clm6_0 physics these options are now default turned on 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 is now Sturm_1997
  • New IC file for f09 1850
  • New crop calendars
  • Dust emissions is now Leung_2023
  • Excess ice is turned on
  • Updates to MEGAN for BVOC's
  • 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 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 results in mksurfdata_esmf now giving identical answers with a change in number of processors, as it should.
  • Add in creation of ne0np4.POLARCAP.ne30x4 surface datasets.
  • Add version to the surface datasets.
  • Remove the --hires_pft option from mksurfdata_esmf as we don't have the datasets for it.
  • Remove VIC fields from surface datasets.

New input datasets to mksurfdata_esmf:

  • Updates in PFT/LAI/soil-color raw datasets (now from the TRENDY2024 timeseries that ends in 2023), as well as two fire datasets (AG fire, peatland), and the glacier behavior dataset.