Evaluation of the CAS-ESM2-0 Performance in Simulating the Global Ocean Salinity Change

The second version of the Chinese Academy Sciences Earth System Model, CAS-ESM2-0, is a newcomer that contributes to Coupled Model Intercomparison Project simulations in community. We evaluated model’s performance simulating salinity for climatology, seasonal cycles, long-term trends, and time series climatic metrics by comparing it with ensemble mean available gridded observations. results showed CAS-ESM2-0 could reproduce large-scale patterns ocean climatology variations, despite fresh biases low- mid-latitudes stronger variation sea surface within 20° S–20° N, large uncertainty zonal-band structure 0–1000 m averaged salinity. For changes, model revealed increased contrast between Atlantic Pacific basins. However, regional differences locations strengths pattern amplification suggest substantial when multidecadal changes. simulated variations climate are consistent observations will continue intensify until end this century. Our assessment provides new features supports further studies on development.