Improving Global Weather Prediction in GFDL SHiELD Through an Upgraded GFDL Cloud Microphysics Scheme

We describe the third version of Geophysical Fluid Dynamics Laboratory cloud microphysics scheme (GFDL MP v3) implemented in System for High-resolution prediction on Earth-to-Local Domains (SHiELD). Compared to GFDL v2, v3 is entirely reorganized, optimized, and modularized into functions. The particle size distribution (PSD) all hydrometeor categories redefined better mimic observations, droplet number concentration (CDNC) calculated from Modern-Era Retrospective analysis Research Applications, 2 (MERRA2) aerosol data. In addition, has been redesigned so processes use PSD ensure overall consistency easily permit introduction new PSDs microphysical processes. A year's worth global 13-km, 10-day weather forecasts were performed with MP. significantly improves SHiELD's predictions geopotential height, air temperature, specific humidity Troposphere, as well high, middle total fractions liquid water path. are improved even further by reanalysis data calculate CDNC, also using more realistic available v3. However, upgrade shows little impact precipitation prediction. Degradations caused discussed provide a guide future development.