Intermodel uncertainty in response of the Pacific Walker circulation to global warming

The Pacific Walker circulation (PWC) is one of the major atmospheric circulations that plays an essential role in ocean-atmosphere interactions and global climate. response PWC to greenhouse warming remains a mystery model results are inconsistent. Based on multimodel simulations from Coupled Model Intercomparison Project phase 6 (CMIP6), this study explores intermodel uncertainty change under warming. combination El Niño-like pattern interbasin contrast between Indian Oceans strengthens (weakens) west (east) branch trade winds, resulting structural shifting PWC. By conducting set Atmosphere General Circulation (AGCM) experiments, we demonstrate western critical driving shift. An intensified counteracts effect Ocean PWC, leading uniformly weakened tropical due SST gradient. In contrast, decreased turning longitude zonal wind changes eastward. Our finding highlights relative coupled with warmer