Inter-model spread of AMO-related tropical precipitation in CMIP6

As a prominent large-scale mode in the Northern Hemisphere, the Atlantic Multidecadal Oscillation (AMO) can have a profound impact on regional and global climate. This study investigates inter-model spread of AMO-related tropical precipitation anomalies by using 52 models in the historical simulation from Coupled Model Intercomparison Project phase 6 (CMIP6). The results indicate that there is a significant spread in AMO-related precipitation anomalies among models in the tropics, particularly in the Maritime Continent–tropical western Pacific. In addition, the inter-model spread is characterized by a seesaw pattern between the Maritime Continent and tropical western Pacific, identified as the primary mode through inter-model EOF analysis. Furthermore, associated with the differences in AMO-related tropical precipitation anomalies, there are substantial differences in sea surface temperature anomalies in the tropics and surface air temperature anomalies in the Eurasian continent.