This is what a Japanese scientist modeled back in the 90's when he got access to a supercomputer, and he developed a theory specifically that incorporates this and says you got from warming to Ice Ages quickly when the "conveyor" breaks, as the warm water is what keeps Britain and Northern Europe somewhat temperate. His theory was really reflective of what they are describing here, the fresh water changes the density of the ocean and blocks the downward movement and cooling of water. I am trying to find hid original presentation, as he suggested that this is cyclical and normal for our planet.