DART Data Archive

• WRF tutorial updated to get data from data.dart.ucar.edu #305
• Fix defaults for MOM6 assimilation period to 1 day #1032

Log DART version

New Features:

• Version of DART logged in program message #747
  contributed by Kamil Yousuf
• Tests for parse_args_mod #231
• Remove close_ind array initialization for 3d sphere and 3d
  cartesian location_mods to improve get_close performance. #910

Bug-fixes:

• model_mod_check model_size collected in test initialization #1016

BAMS 2025 article

Documentation updates:

• How to cite DART #997
• Bulletin of the American Meteorological Society 2025 article

Bug-fix:

• Assert sea surface height is present in the state for ROMS Rutgers
  model_interpolate #1001

HF Radar converter

New features:

• High Frequency (HF) Radar ocean observation converter.
• ROMS–Rutgers: Option to use Sea Surface Height from the template file,
  assuming the ensemble mean is provided in that file.

Bug-fix:

• Corrected consistency check across restarts when fill or missing attributes are NaN. #970 #323

Aether Cube Sphere

• Aether model of the thermosphere and ionosphere cube sphere interface added to DART. #665
• SLANT_GPS_VTEC QTY and obs_def.

DART tutorial

• DART tutorial updated to QCEFF v11 #725 #810
• DART tutorial now an extension of DART_LAB
• Lorenz_96/work directory contains input files needed for DART_LAB6:DART_tutorial
• PDF tutorial slides relocated to a separate repo: https://github.com/NCAR/dart-tutorial

Bug-fix: MOM6 localization

• Fix state index passed to below_sea_floor
• Convert state vertical location to meters inside get_close_state

CrocoLake observation converter

Observation converter for CrocoLake, a database of oceanographic observations developed and maintained in the framework of the NSF-sponsored project CROCODILE (CESM Regional Ocean and Carbon cOnfigurator with Data assimilation and Embedding).

More details about CrocoLake can be found at the Woods Hole Oceanographic Institution Biogeochemical Ocean Observing and Modeling Lab (boom-lab): crocolake-python.

contributed by Enrico Milanese, Woods Hole Oceanographic Institution

Radiance updates

Radiance updates:

• Enables microwave radiance emission for RTTOV13
• Allows user to bring in liquid/ice effective droplet radius from model as an alternative to the fixed default value
• Specifies the max cloud fraction from the model as the effective cloud fraction
• Fixes hydrometeor type 'hydrotable' to expect the order: rain, snow, graupel, cloud water cloud ice
• For visible radiance applies empirical 0.1 factor against snow when calculating total cloud ice
• Documentation rewritten to give an overview over capabilities, list advice, and give references to further material
• WRF model_mod: added type_clwde type_icede

Developed in collaboration with Lukas Kugler

Documentation updates:

• Improved contributors guide #813
• Default_model_mod routines docs improved for usage in model_mods #798, #957
• Brief history of DART extended to present day #900
• Duplicate/out-of-date location_mod doc removed #796 (comment)

Bug fixes:

• Standard C compliance for gregorian_time.c #961
• obs_def_rttov_mod.f90 TOA indexing

KDE and CICE-DART improvements

KDE performance improvements:

• Fixed ITP algorithm in the root finding mod, faster convergence.
• Namelist option for KDE to use 5th, 7th or 9th order Gaussian quadrature.
• Boundary correction has been updated to reduce unnecessary computation.
• Unused function removed.

contributed by Ian Grooms, University of Colorado, Boulder

CICE-DART postprocessing improvements:

• Two new post processing options.

contributed by Molly Wieringa, ASP Postdoctoral Fellow, NSF NCAR