Effect of horizontal resolution on the simulation of tropical cyclones in the Chinese Academy of Sciences FGOALS-f3 climate system model

Abstract. The effects of horizontal resolution on the simulation tropical cyclones were studied using Chinese Academy Sciences Flexible Global Ocean–Atmosphere–Land System Finite-Volume version 3 (FGOALS-f3) climate system model from High-Resolution Model Intercomparison Project (HighResMIP) for Coupled phase 6 (CMIP6). Both low-resolution (about 100 km resolution) FGOALS-f3 (FGOALS-f3-L) and high-resolution 25 (FGOALS-f3-H) models used to achieve standard Tier 1 experiment required by HighResMIP. FGOALS-f3-L FGOALS-f3-H have same parameterizations with exactly parameters. only differences between two are time step. performance in simulating was evaluated observations. (25 simulated more realistic distributions formation, movement intensity climatology than at resolution. Although number increased about 50 % higher better matched observed values peak month, both appear replicate timing seasonal cycle cyclones. average interannual variabilities accumulated cyclone energy significantly improved over most ocean basins. characteristics (e.g., lifetime, wind–pressure relationship structure) model. possible physical linkage revealed further analyses. improvement response El Niño–Southern Oscillation contributed genesis potential index vorticity, relative humidity, maximum wind shear terms diagnose We discuss current insufficiencies future directions applications subseasonal prediction