What was the exact effect of drainage on the formation of North Atlantic Deep water, the thermohaline circulation, and climate?

It appears that the main extraction of excess C O two of the atmosphere is accomplished in the northern hemisphere, associated with the north Atlantic deep water.

Perhaps half of the carbon dioxide introduced to the atmosphere has been removed by the ocean, primarily occurring in the northern hemisphere in the production of north Atlantic deep water.

Additionally, it has been found from a separate study that a freshwater flux of 0.53 Sv into the North Atlantic Ocean in the absence of an existing thermohaline circulation could reduce North Atlantic Deep Water production by 95% in about a century.