So, there was a prong of the Gulf Stream, and now it has been cut off. This is a surface temperature map. There is now a very strong current from the Arctic caused by the increasing volume of sea ice. As the ice freezes, it takes up fresh water, and leaves cold saline water to sink. The saline comes pouring down to the Atlantic cooling everything.
You can see that the Atlantic streamer ignores it. At the same time, you can see the dead El Nino has not caused the Pacific trade winds to reverse.