Evaluation of Coupled Model Intercomparison Project Phase 6 model?simulated extreme precipitation over Indonesia

The ability of 42 global climate models from the Coupled Model Intercomparison Project Phase 6 (CMIP6), consisting 20 low resolution (LR) and 22 medium (MR), are evaluated for their performance in simulating mean extreme precipitation over Indonesia. Compared to Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS), model climatologies interannual variability investigated individually as multimodel ensemble means (MME-mean) at monthly seasonal time scales historical simulation period 1988–2014. Overall, results show that both LR MR CMIP6 skills indices vary across specific Indonesian regions seasons. individual MME-mean tend overestimate observed climatology, being largest drier regions, yet perform better compared regarding bias presumably due increased resolution. simulate dry seasons wet season. MME-means groups mostly outperform each group extremes (R95p Rx5d) but not (CDD). Among models, three consistently poorly Rx5d R95p, namely FGOALS-g3, IPSL-CM6A-LR, IPSL-CM6A-LR-INCA, one consecutive day (CDD) simulation, MPI-ESM-1-2-HAM, caution is warranted. Given knowledge such biases, can be suitably applied assist policy makers decision on change adaptation mitigation action.