Coupled model prototype5 (s2sp5) - UFS R2O
Coupled Model Prototype5 (s2sp5)
The UFS S2Sp5 is the latest experimental version of the UFS coupled model (frozen as of September 8, 2020 and available on GitHub). This experimental version represents a significant intermediate stage in the ongoing development of the next release of the UFS seasonal to sub-seasonal (s2s) application. More details of the model components and configuration are provided below.
Model and data details
The UFS S2Sp5 is a coupled atmosphere-ocean-sea ice model with FV3 dynamical core for the atmosphere. All components are coupled using the NOAA Environmental Modeling System (NEMS) infrastructure. The UFS S2Sp5 coupled system is being developed based on the uncoupled model (Global Forecast System (GFS)) that is being used operationally for the medium range weather application. More details of the current operational GFS version can be found in the EMC Model Evaluation Group’s briefings.
|Atmosphere||GFDL's Finite Volume Cubed-Sphere dynamical core (FV3) horizontal resolution c384 (~25km), 64 vertical levels|
|Ocean||GFDL MOM6, Hybrid-coordinates with tripolar grid, 0.25 degree global resolution. 75 hybrid levels, OM4 Set up [Adcroft, 2019]|
|Sea Ice||Los Alamos Sea Ice Model, version 6 (CICE6). Same grid as the ocean model. 5 thickness categories
No Mushy thermodynamics
|Physics||GFSv15 Physics that includes Scale-aware Simplified Arakawa-Schubert Scheme for convection (Han and Pan 2011), Hybrid Eddy-Diffusivity Mass-Flux (EDMF) Boundary Layer Parameterization (Han et al., 2016), Rapid Radiative Transfer Model for GCMs (RRTMG) with Monte-Carlo Independent Column Approximation (McICA) for radiation scheme, GFDL microphysics with 5 prognostics cloud species.|
|Waves||WAVEWATCH III wave model at 0.5 degree regular grid. Provides feedback to the atmosphere and ocean. ST4 Physics [Ardhuin, 2010].|
|Reforecast period||Forecast lead||Frequency of initialization||Initial conditions (data)||
|April 2011 to March 2018 (7 years)||6 hourly output, out to 35 days||1st and 15th of each month, 168 forecasts in total.||Atm: CFSR
Ocn: 3Dvar CPC
Sea ice: CPC Ice analysis
Waves: generated with CFS forcings
|Control run only|
Data format, variables
|Component||Tar file||Contents*||Output Interval||Grid Resolution||File Format|
|Atmosphere||gfs_prgb2_0p25.tar||Atmospheric temperature, humidity, zonal, meridional and vertical velocity, vorticity, geopotential height, mixing ratios, at mandatory pressure levels||6-hourly||C384 converted to regular
|gfs_pgrb2b_0p25.tar||Atmospheric temperature, humidity, zonal, meridional and vertical velocity, vorticity, geopotential height, mixing ratios, at additional levels|
|gfs_flux.tar||Radiation, heat and momentum fluxes
Cloud height and cover
Surface and near-surface fields
Liquid and solid precipitation
Soil temperature and moisture
|Ocean||ocn_2D.tar||Sea surface height, salinity, temperature, velocity, fluxes
Mixed layer depth
|6-hourly||Tripolar, primarily at ¼ degree
|ocn_3D.tar||3-D fields of potential temperature, salinity, velocity|
|Sea Ice||ice.tar||Ice area, thickness, velocity, stress, melt, growth, snow cover, freeze/melt onset
Fluxes, temperatures, precipitation rates
|6-hourly||Tripolar, primarily at ¼ degree
*List of key variables, Tar files contain a number of other fields.
In collaboration with the NOAA Big Data Program, the s2sp5 data is now available on the AWS here.
Researchers interested in the s2s prediction and model development are invited to evaluate the UFS S2Sp5 data. Analysis of the data may include, but is not limited to, process-based evaluations, diagnostic measures that reveal coupled feedback processes and s2s forecast skill estimations. Interested researchers may also volunteer to communicate their findings to the UFS-R2O project team, see POC below. Note that this is a voluntary opportunity to collaborate. No funding is associated with this announcement at this time.
Requirements for Data usage
Users of UFS S2Sp5 data are requested to acknowledge the data source and sponsoring agencies that support the the UFS-R2O project. In publications, it is recommended to include a text similar to the one below, in the acknowledgement section.
“The Unified Forecast System (UFS) coupled model experimental version 5 (UFS S2Sp5) data used in this study are produced at the National Weather Service Environmental Modeling Center, NWS/NCEP/Environmental Modeling center (EMC), and made available through the UFS Research to Operations (UFS-R2O) project that is sponsored by the National Weather Service (NWS) Office of Science and Technology Integration (OSTI) Modeling Program Division and the National Oceanic and Atmospheric Administration (NOAA) Oceanic and Atmospheric Research (OAR) Weather Program Office (WPO).”
Users are cautioned the data was made with an intermediate version of the UFS that is still under vigorous development and evaluation, see NWS disclaimer for additional details.
For additional information about the s2sp5 data set, please contact Stylianos Flampouris at: firstname.lastname@example.org
For inquiries on how to engage with the UFS R2O project in general, please contact the project leads at email@example.com