Which mechanism drives the observed periodic changes in global thermohaline circulation strength?

💡 Explanation

When North Atlantic deep water (NADW) formation fluctuates, density gradients affecting thermohaline flow change due to salinity and temperature variations. This alters the global circulation's strength through density-driven convection. Therefore changes in NADW control circulation rate, rather than solar cycles, vent plumes, or orbital wobbles, which have distinct timescales and impacts.

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