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The team speculates that this movement may be mirroring the North Atlantic Current, in which seawater flows from west to east.

Instead of the coastlines that define the boundaries of most bodies of water, the 600-mile-wide Sargasso is surrounded by several ocean currents—the Gulf Stream, the North Atlantic Current, the Canary Current, and the North Equatorial Current—that meet there.

Previous research suggests a slowdown in the North Atlantic current could cause Europe to become colder.

Take the disruption of the North Atlantic Current, the pivotal event in The Day After Tomorrow. 

In that movie — most notable for its vivid scenes of a frozen-over New York City — melting polar ice causes a disruption in the North Atlantic Current, which in turn triggers a series of catastrophic storms and disasters.