Nature
http://www.nature.com/news/2010/1003...l/464657a.html

Extract -
Broecker, however, says that the Arctic flood is just what his theory
needed. He says that flood waters heading down the St Lawrence River
might not have affected the thermohaline circulation anyway, because
the sinking takes place far to the north, near Greenland. A pulse of
fresh water into the Arctic, however, would ultimately have flowed
into the North Atlantic and pulled the climate trigger there. "There's
no way for that water to go out of the Arctic without going into the
Atlantic," he says.

David Christainsen