Antarctic Circumpolar Current

Macquarie is a welcome pit stop in nearly 22 million square kilometer Southern Ocean that just happens to have an all-you-can-eat buffet right on your doorstep, and Macquarie's geology is what help keeps that buffet fully stocked.

Life in the south is driven by the Antarctic Circumpolar Current, the world's largest current, that flows relentlessly eastward around Antarctica.

The Macquarie Ridge stands right in its way, forcing deep, cold, nutrient-rich water to the surface.

Think of it like a giant 1,600-kilometer wall that the ACC smashes into.

It honestly reminds me of, um, like putting a car on a massive circular racetrack, but you move all the stop signs and take away all the friction on the road.

The Antarctic Circumpolar Current down there just races around the continent from west to east.

Mm.

And because it never hits anything, it just builds endless momentum.

Right.

So the opening of the Drake Passage did exactly that, but with ocean currents.

It allowed the Antarctic Circumpolar Current to form, creating this impenetrable high-speed jet of water looping endlessly around the continent.

That is a perfect analogy.

But that insane wind in the westerlies around Antarctica drives the biggest ocean current on the planet.

The Antarctic Circumpolar Current, which runs all the way around Antarctica, is what we call unbounded.

It does not run into a boundary, a barrier.

It keeps going, and it is felt, not-- So the Gulf Stream is felt down to, you know, 600 to 800 meters.