Coupled climate response to Atlantic Multidecadal Variability in a multi-model multi-resolution ensemble

Abstract North Atlantic sea surface temperatures (SSTs) underwent pronounced multidecadal variability during the twentieth and early twenty-first century. We examine impacts of this Multidecadal Variability (AMV), also referred to as Oscillation (AMO), on climate in an ensemble five coupled models at both low high spatial resolution. use a SST nudging scheme specified by Coupled Model Intercomparision Project’s Decadal Climate Prediction Project Component C (CMIP6 DCPP-C) impose persistent positive/negative phase AMV model simulations; SSTs are free evolve outside region. The large-scale seasonal mean response positive involves widespread warming over Eurasia Americas, with pattern cooling Pacific Ocean similar (PDO), together northward displacement inter-tropical convergence zone (ITCZ). accompanying changes global atmospheric circulation lead precipitation. Analysis Variance (ANOVA) demonstrate that is accompanied significant differences between how they respond common forcing, particularly tropics. These may arise from variations air-sea heat fluxes despite forcing pattern. cannot detect effect increased horizontal resolution response, exception ITCZ, which shifts further northwards higher configurations.