Multiple same-level and telescoping nesting in GFDL's dynamical core

Abstract. Two-way multiple same-level and telescoping grid nesting capabilities are implemented in the Geophysical Fluid Dynamics Laboratory (GFDL)'s Finite-Volume Cubed-Sphere Dynamical Core (FV3). Simulations performed within GFDL's System for High-resolution modeling Earth-to-Local Domains (SHiELD) using global regional nest configurations. Results show that multi-level nests were able to capture various weather events greater details by resolving smaller-scale flow structures. updates do not introduce numerical errors their corresponding parent grids where located. The cases of Hurricane Laura's landfall an atmospheric river California found be more intense with increased levels nesting. All nested run concurrently, adding additional computer cores a setup does degrade computational performance nor increase simulation time if optimally distributed among grids.