What ocean circulation system is hypothesized to have shut down due to freshwater influx during the Younger Dryas?

Answer

The thermohaline circulation

The influx of freshwater from melting glaciers, specifically Lake Agassiz draining into the North Atlantic, is thought to have caused a partial or complete shutdown of the global conveyor belt known as the thermohaline circulation.

What ocean circulation system is hypothesized to have shut down due to freshwater influx during the Younger Dryas?
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