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The ocean's saltiness and its overturning

Here we explore the relationship between the mean salinity S̄ of the ocean and the strength of its Atlantic and Pacific Meridional Overturning Circulations (AMOC and PMOC). We compare simulations performed with a realistically configured coarse‐grained ocean model, spanning a range of mean salinities. We find that the AMOC strength increases approximately linearly with S̄ . In contrast, the PMOC strength declines approximately linearly with S̄ until it reaches a small background value similar to the present‐day ocean. Well‐established scaling laws for the overturning circulation explain both of these dependencies on S̄ .