The link above talks about how it is believed that a massive flood of fresh water from North America into the Atlantic about 8,200 years ago did affect the ocean currents and reduce temperature suddenly in the northern hemisphere.
Interestingly, though, the study also says this:
"...the team's results showed that the flood had much milder effects around the globe than many people fear--including the dramatic shifts in climate depicted in the 2004 movie 'The Day After Tomorrow'.
According to the model, temperatures in the North Atlantic and Greenland showed the largest decrease, with slightly less cooling over parts of North America and Europe. The rest of the northern hemisphere, however, showed very little effect, and temperatures in the southern hemisphere remained largely unchanged. Moreover, ocean circulation, which initially dropped by half after simulated flood, appeared to rebound within 50 to 150 years.
"This was probably the closest thing to a 'Day After Tomorrow' scenario that we could model," said LeGrande. "The flood we looked at was even larger than anything that could happen today.""
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