v18.0.0 - MODIS snow cover fraction and ASCAT soil moisture assimilation

• 0-diff vs. v17.13.1 except for MAPL bug fix (PR #734). Simulations with data assimilation are not 0-diff between SLES12 vs. SLES15 on NCCS/Discover (PR #693).

• Notes:

  • Release uses original GEOSldas repository structure. Next release is expected to use a revised repository structure.

• Science changes:

  • Added MODIS snow cover fraction assimilation (PR #512).
  • Added ASCAT soil moisture assimilation (PR #656, PR #703, PR #723, PR #729).
    • New update_type=13 for ASCAT soil moisture and SMAP brightness temperature assimilation (PR #703).
    • New update_type=13 replaces update_type=[1,2], which has been disabled.
    • Requires ASCAT mask file (PR #723, PR #729).
  • Disabled CatchmentCNCLM45 model option (LSM_CHOICE=3) (PR #707, GEOSgcm_GridComp PR #900).
  • Added support for GEOS-IT surface met forcing (PR #688).
  • Added CATCHMENT_SPINUP mode (PR #647, GEOSgcm_GridComp PR #751).

• GEOSgcm_GridComp v2.5.2:

  • Improved MODIS-based snow albedo (v2) in make_bcs package (GEOSgcm_GridComp PR #687).
  • Major source code cleanup:
    • Stieglitz snow model (GEOSgcm_GridComp PR #834).
    • make_bcs package (GEOSgcm_GridComp PR #763, GEOSgcm_GridComp PR #786, GEOSgcm_GridComp PR #846).
    • coeffsib (GEOSgcm_GridComp PR #845).
  • Fixed CDCR2 long_name (GEOSgcm_GridComp PR #818).
  • Optional checks of snow states after application of LDAS increments (GEOSgcm_GridComp PR #834).
  • Refined check for allowable bcs versions for CatchCN (GEOSgcm_GridComp PR #882).
  • Fixed treatment of atmospheric CO2 input file for CatchCN (PR #663, GEOSgcm_GridComp PR #771).
  • Fixed bug when reading vegetation type ity from restart (GEOSgcm_GridComp PR #757).
  • Fixed bug to correct vegetation fraction assessment in GetIds_carbon (getids.F90) for CatchCN (GEOSgcm_GridComp PR #770).

• Interface:

  • Use boundary conditions inputs in revised directory layout and naming convention (PR #680).

• Utilities:

  • GMAO_Shared v1.9.7 (PR #725).
  • GEOS_Util v2.0.7 (PR #725).
    • Sparse checkout of GEOS_Util (PR #711).
    • Improved remap_restarts package (GEOS_Util PR #43, GEOS_Util PR #43, GEOS_Util PR #53)
  • Added NCEP_Shared v1.3.0 (PR #656).

• Infrastructure:

  • Updated for NCCS/Discover hardware:
    • Added support for SLES15/Milan nodes (PR #693).
    • Removed support for Haswell nodes (PR #681).
  • Support for running GEOSldas at the NASA Advanced Supercomputing (NAS) facility (PR #706).
  • Allow experiment setup from another user's build (PR #733, PR #740).
  • ESMA_env v4.23.0, Baselibs v7.16.0 (PR #681).
  • ESMA_cmake v3.41.0 (PR #725).
  • MAPL v2.44.1 (PR #734).
  • CircleCI Orb v2 (PR #694).
  • Replaced FLAP with fArgParse (PR #669).
  • Updated versions of GitHub Actions (PR #739).

• Documentation:

  • Updates and corrections (PR #728).

• Bug fixes and other minor changes:

  • Fixed bug that degraded simulation when writing (MAPL-binary) instantaneous output with bit shaving (PR #734).
  • Removed requirement for mwRTM parameter input files (PR #685).
  • Support for reading corrected precipitation from aggregated daily netcdf files (PR #718).
  • Updated generate_catchincr_hist.py and sample documents for coupled land-atmosphere data assimilation (PR #698).
  • Bug fix to avoid NaN for ens std-dev in debug mode (PR #679).
  • Implementation changes for FFT used in perturbations (PR #679).
  • Some cleanup of unused variables (PR #679).
  • Updated met forcing path when coupled with ADAS (PR #682).
  • Added more export variable definitions to tile_bin2nc4.F90 (PR #676).
  • Fixed LONG_NAME for longwave radiation variables (PR #674, GEOSgcm_GridComp PR #764).
  • Fixed bug in matlab reader MAPL_ReadForcing_fullfile.m (PR #665).
  • Renamed GEOSldas_GridComp/Shared to GEOSldas_GridComp/LDAS_Shared (PR #714).