A Simple Conceptual Model for the Self‐Sustained Multidecadal AMOC Variability

Abstract Multidecadal variability of Atlantic Meridional Overturning Circulation (AMOC) has been reconstructed by various proxies, simulated in climate models, and linked to multidecadal Arctic salinity variability. Here we construct a simple conceptual model understand the two‐way interactions with AMOC through delayed oscillator mechanism. We revise Stommel's Two‐Box Model including an advective time delay for density/salinity anomalies reach subpolar North coupled negative feedback between freshwater flux entering atmosphere and/or sea ice responses. Self‐sustained oscillations exist revised if oceanic is longer than oscillation threshold, periods depend crucially on this delay. The provides additional reduces threshold required oscillations.