:orphan: .. _CCPPUpdates: ================================================ CCPP Updates for the SRW App v2.2.0 Release ================================================ Here is what's new in CCPP Physics for the UFS SRW v2.2.0 public release. General Updates ================= * Added RAP suite (``FV3_RAP``) as a new supported suite (documentation `here `__) * Added the Community Land Model (CLM) lake model in the HRRR suite (``FV3_HRRR``) Thompson Microphysics Scheme ============================== * 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 .. note:: The above improvements were tested with the non-aerosol option, so results with the aerosol-aware Thompson (used in the SRW App) may vary. NoahMP Land Surface Model =========================== * 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 RUC Land Surface Model ======================== * 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 * 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 GFS Scale-Aware TKE-EDMF PBL and Cumulus Schemes ================================================== * 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 MYNN-EDMF PBL Scheme ====================== * 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 Subgrid-Scale (SGS) Clouds Scheme =================================== * 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 MYNN Surface-layer Scheme =========================== * Reintroduced friction velocity averaging over water to reduce noise in 10-m winds in the hurricane regime Grell-Freitas Scale and Aerosol Aware Convection Scheme ========================================================= * 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 question Unified Gravity Wave Physics Scheme ===================================== * Optional diagnostic for tendencies computed. They can be switched on by setting the following namelist variables to ``“.true.”``: ``ldiag3d`` and ``ldiag_ugwp`` .. attention:: The improvements in Thompson cloud microphysics, NoahMP land surface model, GFS TKE-EDMF and cumulus schemes were tested in the UFS global configuration, so results in the UFS limited-area configuration (SRW) may vary.