The Gulf of Mexico is the starting point of the great warm-water circulation that concerns the researchers in the novel: heat gathered in tropical waters becomes a force felt as far away as northern Europe. The location matters not as an isolated body of water, but as the opening of a chain of currents, atmospheric effects, and deep-ocean movements whose scale exceeds ordinary human perception.

The Gulf Stream's warm-water source

The account locates the source of the researchers’ concern in the Gulf of Mexico. Temperate surface water moves from Africa along the coast of South America and is warmed by the sun in the Caribbean basin. Retaining its heat, the salty water stays near the surface and continues north as the Gulf Stream. The Gulf is thus associated with the beginning of a consequential movement of energy, not merely with a current’s name on a map.

The current is described as Europe’s mobile heater, carrying a billion megawatts of warmth—an amount compared in the text to the output of 250,000 nuclear power stations. That immense figure gives the Gulf’s connection to the wider system a material scale: water warmed in the tropics helps moderate conditions far to the north.

From surface current to global circulation

Farther north, the Gulf Stream meets colder water near Newfoundland and disperses. Some of its warm water breaks away into swirling eddies that travel onward as the North Atlantic Drift. Prevailing westerly winds draw moisture from the current; evaporation raises the water’s salinity, while the resulting rain contributes to Europe’s climate. Along Norway, the flow continues as the Norwegian Current, remaining warm enough for ships to dock in south-west Spitsbergen even in midwinter.

The journey does not end at the surface. Near Greenland and northern Norway, the water is rapidly cooled by the Arctic’s icy ocean and winds. Dense with salt and cold, it sinks through moving columns of water called convective chimneys. These are difficult to locate because their positions shift with the swell: individual chimneys measure roughly twenty to fifty metres across, with about ten clustered in a square kilometre, but their exact locations can change from day to day.

This sinking water creates the suction that draws the current northward. The circulation is therefore not simply a surface stream pushing its way toward the pole; it depends on a deep-water pump in the Arctic. At depths of roughly 2,000 to 3,000 metres, the water begins its return journey around the world. The Gulf of Mexico’s narrative significance rests on this far-reaching connection between tropical warmth, Arctic sinking, and planetary circulation.