Development of the CCPP-Based GEFS-Aerosols Component in the Unified Forecast System for Subseasonal Prediction (UFS-Chem v1.0)

1) UFS-Chem v1: The Unified Forecast System coupled with Chemistry (UFS-Chem v1) is a fully interactive atmosphere-chemistry-aerosol coupled modeling system that incorporates the Configurable Atmospheric Chemistry (CATChem) library and modeling component to enable fully interactive aerosol and gas-phase chemistry feedbacks within the Unified Forecast System (UFS) framework. The aerosol component of UFS-Chem v1 is based on the operational GEFS-Aerosols v12.3, which includes significant improvements relative to the original v12 configuration, and is implemented using the Common Community Physics Package (CCPP) framework. 2) The Global Ensemble Forecast System (GEFS) version 12 has been operational at the National Centers for Environmental Prediction since September 2020, with GEFS-Aerosols (Zhang at al., 2022: https://doi.org/10.5194/gmd-15-5337-2022) serving as its global aerosol forecasting member. In 2023, GEFS-Aerosols was upgraded to version 12.3 in operations, incorporating improvements to wet deposition, anthropogenic and biomass burning emissions, aerosol optical depth calculations, and the FENGSHA dust emission scheme.