Climate Variability in the Tropical Oceans Simulated by a Coupled GCM--CAS FGOALS3

This study describes basic performance of a coupled GCM in the tropical oceans. The coupled model is the Flexible Global Ocean-Atmosphere-Land System (FGOALS) model version3.0 known as FGOALS3. FGOALS3 consists of the following components: GAMIL3 or FAMIL (atmosphere), LICOM3 (ocean), CICIE4 (sea ice), and CLM4 (land). There are two options for atmospheric component models: GAMIL3 and FAMIL, and the corresponding names of coupled models are FGOALS-g3 and FGOALS-f3. These components are coupled together with the flux coupler from NCAR. Both two versions has been used to conduct the experiments for analysis studies in support of the sixth assessment report of the Intergovernmental Panel on Climate Change (IPCC AR6) and phase 6 of the Coupled Model Intercomparison Project (CMIP6). In this study, both the 500-year preindustrial control run and 165-year historical run with FGOALS-g3 and FGOALS-f3 from 1850-2014 are evaluated, in which the interaction between Indian and Pacific Oceans through ocean tunnel and atmospheric bridge has been paid to specific attention.