Haiqin Li1,2 Georg A. Grell2 Li Zhang1,2 Stuart Mckeen1,31CIRES – University of Colorado, Boulder, 2NOAA /ESRL/GSL/Earth Prediction Advancement Division, 3NOAA/ESRL/CSL

The Common Community Physics Package (CCPP) isdesigned to facilitate the implementation of physics innovations in state-of-the-artatmospheric models. At GSL, in collaboration with Chemical Science Laboratory, and AirResource Laboratory (GSL, CSL, ARL) we developed an atmospheric composition suite(GSDchem, based on WRF-Chem) and coupled it online with FV3GFS through usingNational Unified Operational Prediction Capability (NUOPC)-based NOAA environmentalmodeling system (NEMS) software. It demonstrates significant improvement compared tothe current operational NEMS GFS Aerosol component (NGAC) system, and is slated tointo operations as an ensemble member of the Global Ensemble Forecast System (named asGEFS-aerosols) in September of 2020. Recently, we have included the same atmosphericcomposition suite of in FV3 using CCPP, and developed two CCPP-compliant versions.When using NUOPC coupler, there are two independent components for weather andchemistry that communicate via NUOPC coupler every time-step. In first version of thedevelopment, the GSDChem modules are called by a CCPP-compliant driver after all thephysics schemes at every time step. Because of the interactive and strongly couple natureof chemistry and physics it may be better to allow for some of the atmospheric compositionmodules to be called directly from inside the physics suite. Therefore, in a second moredeveloped CCPP version, GSDchem was broken up and all the chemical modules wereembedded into FV3 as subroutines of physics. We evaluated the model output of chemicaltracers; it is able to reproduces the performance as that of using the NUOPC coupler.

4. Summary• The GSL Chemical model (GSDChem), which is based on GOCART from

WRF-Chem with some updates, has been successfully implemented into FV3 with CCPP.

• The FV3GFS/CCPP-Chem is able to reproduce the performance of GEFS-Aerosols (FV3GFS-GSLChem, using NUOPC as coupler).

• The CCPP chemical modules can be applied for both the Global FV3 and the Standalone Regional FV3 (SAR)

• The initial results of the 2nd version, which brakes up the GSDchem and all chemical modules are able to be injected into physics, are reasonable; and it is under further developing and evaluation.

• Get the GSL physics suite working with GSL chemical modules via CCPP.

1. Introduction

2.1). The host model: FV3GFSDynamics Core: Finite Volume Cubed-Sphere (FV3)Physics: Common Community Physics Package (CCPP)-- Global Forecast System physics package

(available)-- GSD physics suite

(in progress)

2.2). The GSL Chemical Model: GSDChem• Transport: Grid-scale transport by GFDL microphysics scheme. Sub-grid

transport by PBL and tracer convective transport and wet scavengingimplemented in Simplified Arakawa-Schubert (SAS) scheme.

• Chemistry: simplified parameterization of sulfur/sulfate chemistry,hydrophobic and hydrophilic black and organic carbon, a 5-bin sea salt, 5-bindust, volcanic ash.

• Emission: Global CEDS and HTAP anthropogenic emission. NESDIS GlobalBiomass Burning Emission Product (GBBEPx) and the 3BEM fires globallybased on MODIS and WFABBA. 1D cloud model is used to calculate injectionheights and plume rise emission rates online. MEGAN biogenic emissions.Volcanic ash.

• Sea-salt and Marine Dimethyl Sulfide: : NASA GEOS-5 GOCART sea saltscheme. GOCART w/ monthly values of marine dimethyl sulfide

• Dust: 2 options available; 5 size bins. FENGSHA dust scheme is used.

2.3). Coupling GSDChem into FV3 through CCPP-- v1: the GSDChem modules are called by a CCPP-compliant driver after all

the physics schemes at every time step-- v2: GSDchem was broken up and all the chemical modules were embedded

into FV3 as subroutines of physics.

GSDChem

Atmosphere(dynamics &

physics)Chemistry

FV3/NUOPC-Chemdynamics

chemistry

physics

FV3/CCPP-Chem

2. Model description of FV3/CCPP-Chem

3.1). FV3/CCPP-Chem v1 .versus. FV3/NUOPC-Chem3. Experiment and Results

FV3/NUOPC-Chem (NUOPC) FV3/CCPP-Chem (CCPP) -- v1

FV3 (FV3 Sep/3/2019) -with chemical updates

(FV3 Sep/3/2019)ufs-weather-model release

GSD-Chem v90 v90

physics GFS physics GFS physics

Feedback to Radiation NO NO

Emission and Input CEDS and GBBEPx V3 CEDS and GBBEPx V3

FV3 Initial conditions GFS (IC=2020030100) GFS (IC=2020030100)

Resolution C384 (~25km) C384 (~25km)

Integration length 24 hours 24 hours

Chemical Start Cold-start, no cycling (chemical tracers initiate from zero)

Cold-start, no cycling (chemical tracers initiate from zero)

3.2). FV3/CCPP-Chem v1 .versus. V2

Fig.1 Combined 5 bin sea salt Fig.2 Combined 5 bins dust Fig.3 Aerosol Optical Depth

microphysics

radiation

LSM

PBL & tracers vertical diffusion

Convection &Convective wet deposition

microphysics

GSDChem

radiation

LSM

sea salt emission

Dust emission

anthropogenic emission

wild fire burning

dry deposition

sedimentation

Convection & convective wet deposition

Chemical interactions

Large-scale wet deposition

Aerosols optical properties

PBL & tracers vertical diffusion

Fig.4 Organic carbon1 Fig.5 Black carbon1 Fig.6 Dust4