Does sound possible indeed.
The lower density is caused by the fact that the meltwater has little to no salinity, and because of the low salinity it also freezes much faster.
What interests me is how this will affect the Thermohaline Circulation, or Great Ocean Conveyor. It could cut off the little amount of warm water going to the Northern Hemisphere, which could cause an actual Ice Age. Only 10% of the water from the THC is traveling north, so a small change in the THC on the southern hemisphere can have a large impact on Northern and Western Europe and the USA Eastern Seabord.
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People have spoken about having another mini ice age myself included, I also find it funny all this "Renewable" energy resources will prove useless in an ice age. With Europe being in a cold snap already I don't think your to far off.
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The cold snap does make you think, but it is caused by something else. There is a large amount of (relatively) warm air on the North Pole, which has forced the High Pressure area that is usually on the North Pole down. That forced the Low Pressure area down also, which is causing the prevailing north winds and cold air. This is not a new phenomenon, but it usually happens in mid-January.
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Not normally upto April which has made this the coldest Easter since records began for the UK.
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Exactly.