AMOC multi-decadal variability under global warming in high-resolution model

We investigate the low-frequency variability of the Atlantic Meridional Overturning Circulation (AMOC) using the CESM coupled model with an eddy-resolving resolution of 0.1°. In the piControl simulation, two dominant modes of AMOC variability are identified: a basin-wide mode spanning the entire Atlantic, with a periodicity of ~45 years; the other is a subpolar-gyre mode confined to the region between 20°N and 60°N, exhibiting a periodicity of ~40 years. The scenario simulation reveals that significant changes occur in AMOC variability under global warming, with an overall shift of AMOC variability towards higher frequencies and a reduction in its low-frequency amplitude. We will describe the impact from the relative contribution by the basin- and subpolar-gyre modes on the future AMOC response and discuss possible underlying processes involving density anomalies and changes in the large-scale atmospheric forcing.