u/Short_Finger_4463

Hey everyone,
I had an incredibly vivid, hyper-detailed dream last night where I was looking at a physical atlas of the Atlantic Ocean with my dad, and my subconscious basically designed a highly plausible climate fiction scenario. I wanted to share the geography of it to see if anyone else finds the physics of it as fascinating as I do.
In the dream, we were looking at the Western Atlantic, and two massive things were happening:
The Northbound Coastal Cold Current: Right along the east coast of North America, there was a freezing, cold ocean current running northbound, hugging the shoreline. Meanwhile, the warm Gulf Stream was pushed much further out into the open ocean, running parallel to it. In the dream, I told my dad that this cold coastal current was going to "influence the climate much more severely as global warming worsens."
The Bellingshausen Ridge: To the east of the Gulf Stream, in the area of Bermuda, my dad pointed out a spot on the map and said, "Look at the place where the water stands, and it's shallow." I looked closer at the atlas, and there was a massive, shallow underwater mountain range stretching for hundreds of kilometers. The map explicitly labeled it "The Bellingshausen Ridge" and showed its depth as only a few dozen meters.
Why this blew my mind when I woke up:
When I looked up the science, my brain apparently stitched together some terrifyingly real oceanography:
The "cold northbound current hugging the coast" perfectly mimics a flipped version of the Deep Western Boundary Current (which usually runs south under the Gulf Stream). In real life, if the AMOC/Gulf Stream collapses due to climate change, the Gulf Stream is predicted to shift drastically out into the ocean, allowing freezing arctic waters to trap the coastline, plunging places like New York into brutal winters.
The "shallow water where it stands" perfectly describes the Sargasso Sea near Bermuda!
While "Bellingshausen" is actually a sea in Antarctica, Bermuda is built on a massive, hundreds-of-kilometers-wide underwater volcanic rise (the Bermuda Rise) with shallow reefs just tens of meters deep.
It feels like my subconscious turned a bunch of random articles about climate change and geology into a fully realized, terrifyingly logical 3D map.

Is there any way to have a cold current flowing from the tropics to the poles along the coast? How would an actual ridge instead of plateau affect the Atlantic Ocean?