Overview of Schemes and Suites

Table of Contents

• Physical Parameterizations
• Physics Suites

Physical Parameterizations

In the CCPP, each parameterization is in its own modern Fortran module (see rules for a scheme to be considered CCPP-compliant at CCPP-Compliant Physics Parameterizations ), which facilitates model development and code maintenance. While some individual parameterization can be invoked for the SCM, most host models will assemble the parameterizations in suites.

Radiation

• RRTMG Shortwave/Longwave Radiation Scheme
• RTE+RRTMGP Shortwave/Longwave Radiation Scheme

PBL and Turbulence

• GFS Scale-aware TKE-based Moist Eddy-Diffusion Mass-Flux (EDMF) PBL and Free Atmospheric Turbulence Scheme
• MYNN-EDMF Boundary Layer and Shallow Cloud Scheme with Subgrid-scale Cloud Interstitial

Land Surface Model

• Noah Land Surface Model
• RUC Land Surface Model
• NoahMP Land Surface Model

Cumulus Parameterizations

• GFS Scale-Aware Simplified Arakawa-Schubert (sa-SAS) Deep Convection Scheme
• GFS SAS-based Mass-Flux Scheme for Shallow convection (sa-MF)
• Grell-Freitas Scale and Aerosol Aware Convection Scheme

Microphysics

• GFDL Cloud Microphysics Scheme
• Thompson Aerosol-Aware Cloud Microphysics Scheme
• NSSL 2/3-moment Cloud Microphysics Scheme

Ozone Photochemical Production and Loss

• Ozone Photochemistry (2015) Scheme

Water Vapor Photochemical Production and Loss

• Stratospheric H2O Scheme

Gravity Wave Drag

• Unified Gravity Wave Physics (GWP) Scheme - Version 0
• Orographic Drag Scheme
• Unified Gravity Wave Physics (GWP) Scheme - Version 1

Surface Layer

• GFS Surface Layer Scheme
• MYNN Surface Layer Scheme

Simplified Ocean and Sea Ice Representation

• Near-Surface Sea Temperature Scheme
• GFS Simple Ocean Scheme
• Sea Ice Scheme

Lakes

• Community Land Model (CLM) Lake Model

The input information for the parameterizations includes the values of the gridbox mean prognostic variables (wind components, temperature, specific humidity, cloud fraction, water contents for cloud liquid, cloud ice, rain, snow, graupel, and ozone concentration), the provisional dynamical tendencies for the same variables and various surface fields, both fixed and variable.

The time integration of the physics suites is based on the following:

• The tendencies from the different physical processes are computed by the parameterizations or derived in separate interstitial routines.
• The first part of the suite, comprised of the parameterizations for radiation, surface layer, surface (land, ocean, and sea ice), and boundary layer is computed using a hybrid of parallel and sequential splitting described in Donahue and Caldwell (2018) [45], a method in which the various parameterizations use the same model state as input but are impacted by the preceding parameterizations. The tendencies from the various parameterizations are then added together and used to update the model state.
• The surface parameterizations (land, ocean and sea ice) are invoked twice in a subcycling loop, with the first time to create a guess, and the second time to produce the tendencies.
• The second part of the physics suite, comprised of the parameterizations of gravity wave physics, ozone, stratospheric water vapor, deep and shallow convection (if using), and microphysics, is computed using sequential splitting in the order listed above, in which the model state is updated between calls to the parameterization.

Physics Suites

The obly publicly supported host model for CCPP v7.0.0 is the CCPP Single Column Model (CCPP-SCM). The forcing datasets included in the CCPP-SCM v7.0.0 public release were created by averaging observations and large-eddy simulations over areas that are too coarse to resolve convection. Therefore, best results will be obtained with the CCPP-SCM v7.0.0 when using suites that include parameterized convection.

Table 1. Physics suites and primary schemes supported in CCPP v7.0.0

Physics suites	GFS_v16	GFS_v17_p8_ugwpv1	GFS_v16_RRTMGP	HRRR_gf	WoFS_v0
Host	SCM	SCM	SCM	SCM	SCM
Deep Cu	GFS Scale-Aware Simplified Arakawa-Schubert (sa-SAS) Deep Convection Scheme	GFS Scale-Aware Simplified Arakawa-Schubert (sa-SAS) Deep Convection Scheme	GFS Scale-Aware Simplified Arakawa-Schubert (sa-SAS) Deep Convection Scheme	Grell-Freitas Scale and Aerosol Aware Convection Scheme	off
Shallow Cu	GFS SAS-based Mass-Flux Scheme for Shallow convection (sa-MF)	GFS SAS-based Mass-Flux Scheme for Shallow convection (sa-MF)	GFS SAS-based Mass-Flux Scheme for Shallow convection (sa-MF)	Grell-Freitas Scale and Aerosol Aware Convection Scheme	MYNN-EDMF Boundary Layer and Shallow Cloud Scheme
Microphysics	GFDL Cloud Microphysics Scheme	Thompson Aerosol-Aware Cloud Microphysics Scheme w/o aerosol-aware	GFDL Cloud Microphysics Scheme	Thompson Aerosol-Aware Cloud Microphysics Scheme	NSSL 2/3-moment Cloud Microphysics Scheme
PBL/TURB	GFS Scale-aware TKE-based Moist Eddy-Diffusion Mass-Flux (EDMF) PBL and Free Atmospheric Turbulence Scheme	GFS Scale-aware TKE-based Moist Eddy-Diffusion Mass-Flux (EDMF) PBL and Free Atmospheric Turbulence Scheme	GFS Scale-aware TKE-based Moist Eddy-Diffusion Mass-Flux (EDMF) PBL and Free Atmospheric Turbulence Scheme	MYNN-EDMF Boundary Layer and Shallow Cloud Scheme	MYNN-EDMF Boundary Layer and Shallow Cloud Scheme
Radiation	RRTMG Shortwave/Longwave Radiation Scheme	RRTMG Shortwave/Longwave Radiation Scheme	RTE+RRTMGP Shortwave/Longwave Radiation Scheme	RRTMG Shortwave/Longwave Radiation Scheme	RRTMG Shortwave/Longwave Radiation Scheme
Surface Layer	GFS Surface Layer Scheme	GFS Surface Layer Scheme	GFS Surface Layer Scheme	MYNN Surface Layer Scheme	MYNN Surface Layer Scheme
LSM	Noah Land Surface Model	NoahMP Land Surface Model	Noah Land Surface Model	RUC Land Surface Model	Noah Land Surface Model
Gravity Wave Drag	Unified Gravity Wave Physics (GWP) Scheme - Version 0	Unified Gravity Wave Physics (GWP) Scheme - Version 1	Unified Gravity Wave Physics (GWP) Scheme - Version 0	Orographic Drag Scheme	Unified Gravity Wave Physics (GWP) Scheme - Version 0
Sea Ice	Sea Ice Scheme	Sea Ice Scheme	Sea Ice Scheme	RUC Land Surface Model	Sea Ice Scheme