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| .. _CCPPUpdates: | ||
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| ================================================ | ||
| CCPP Updates for the SRW App v2.2.0 Release | ||
| ================================================ | ||
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| Here is what's new in CCPP Physics for the UFS SRW v2.2.0 public release. | ||
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| General Updates | ||
| ================= | ||
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| * Added RAP suite (``FV3_RAP``) as a new supported suite (documentation `here <https://dtcenter.ucar.edu/GMTB/UFS_SRW_App_v2.2.0/sci_doc/rap_suite_page.html>`__) | ||
| * Added the Community Land Model (CLM) Lake model in the HRRR suite (``FV3_HRRR``) | ||
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| Thompson Microphysics Scheme | ||
| ============================== | ||
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| * Reduced ice generation supersaturation requirement from 0.25 to 0.15 to generate more ice at the upper levels and reduce the outgoing longwave radiation bias | ||
| * Divided cloud number concentration into two parts (over land and others). Reduced number concentration over ocean to a smaller number (50/L) from its previous default (100/L). Both changes were made to reduce excessive surface downward shortwave radiative flux off coastal regions including the Southeast Pacific | ||
| * Implemented small fixes to the minimum size of snow and collision constants | ||
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| .. note:: | ||
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| The above improvements were tested with the non-aerosol option, so results with the aerosol-aware Thompson (used in the SRW App) may vary. | ||
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| NoahMP Land Surface Model | ||
| =========================== | ||
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| * Option for using the unified frozen precipitation fraction in NoahMP. | ||
| * Diagnostic 2-meter temperature and humidity now based on vegetation and bare-ground tiles (new namelist option ``iopt_diag``) | ||
| * Bug fixes for GFS-based thermal roughness length scheme | ||
| * New soil color dataset introduced to improve soil albedo to reduce the large warm bias found in the Sahel desert | ||
| * Wet leaf contribution factor is included | ||
| * Leaf-area index now depends on momentum roughness length | ||
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| RUC Land Surface Model | ||
| ======================== | ||
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| * Initialization of land and ice emissivity and albedo with consideration of partial snow cover | ||
| * Initialization of water vapor mixing ratio over land ice | ||
| * Initialization of fractions of soil and vegetation types in a grid cell | ||
| * Changes in the computation of a flag for sea ice: set to true only if ``flag_cice=.false`` (atmosphere uncoupled from the sea ice model). | ||
| * Separate variables for sea ice, for example: ``snowfallac`` is replaced with ``snowfallac_ice`` | ||
| * Solar angle dependence of albedo for snow-free land | ||
| * Stochastic physics perturbations (SPP) introduced for emissivity, albedo and vegetation fraction | ||
| * Coefficient in soil resistance formulation (Sakaguchi and Zeng, 2009) raised from 0.7 to 1.0 to increase soil resistance to evaporation | ||
| * Computation of snow cover fraction and snow thermal conductivity updated | ||
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| GFS Scale-Aware TKE-EDMF PBL and Cumulus Schemes | ||
| ================================================== | ||
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| * Parameterization to represent environmental wind shear effect added to reduce excessively high hurricane intensity | ||
| * Entrainment rates enhanced proportionally to the sub-cloud or PBL-mean TKE when TKE is larger than a threshold value | ||
| * Entrainment rate is increased as a function of vegetation fraction and surface roughness length to enhance underestimated CAPE | ||
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| MYNN-EDMF PBL Scheme | ||
| ====================== | ||
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| * Small increase of buoyancy length scale in convective environments | ||
| * Patch for ensuring non-zero cloud fractions for all grid cells where cloud mixing ratio is greater than 1e-6 or ice mixing ratio is greater than 1e-9 | ||
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| Subgrid-Scale (SGS) Clouds Scheme | ||
| =================================== | ||
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| * Bug fix for cloud condensate input into RRTMG radiation | ||
| * New code section for use with SAS convection scheme | ||
| * Cloud fraction now computed as a mix between the area-dependent form and the modified Chaboureau and Bechtold (2005) form | ||
| * Adjusted limit for the boundary flux functions | ||
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| MYNN Surface-layer Scheme | ||
| =========================== | ||
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| * Reintroduced friction velocity averaging over water to reduce noise in 10-m winds in the hurricane regime | ||
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| Grell-Freitas Scale and Aerosol Aware Convection Scheme | ||
| ========================================================= | ||
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| * Update for aerosol-awareness (experimental) | ||
| * Scale-awareness turned off when explicit microphysics is not active anywhere in the column | ||
| * Convection is completely suppressed at grid points where the MYNN PBL scheme produces shallow convection | ||
| * Radar reflectivity considers mass flux PDF as well as whether scale-awareness is turned on at the grid point in equation | ||
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| Unified Gravity Wave Physics Scheme | ||
| ===================================== | ||
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| * Optional diagnostic for tendencies computed. They can be switched on by setting the following namelist variables to ``“.true.”``: ``ldiag3d`` and ``ldiag_ugwp`` | ||
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| .. attention:: | ||
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| The improvements in Thompson cloud microphysics, NoahMP land surface model, GFS TKE-EDMF and cumulus schemes were tested in UFS global configuration, so results in the UFS limited-area configuration (SRW) may vary. |
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