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Why is there no matching circumpolar current around the Arctic Ocean?

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World map showing major ocean current systems, with arrows indicating the direction and speed of warm and cold currents in the Atlantic, Pacific, Indian, Southern, and Arctic Oceans. Warm currents are marked in red and cold currents in blue, with currents labeled by name and symbols denoting those that reverse direction seasonally. A legend explains current speed categories and color codes. — ocean current Major ocean current systems of the world.

The primary reason the Arctic Ocean lacks a circumpolar current comparable to the Antarctic Circumpolar Current is the absence of continuous, open water bordering the Arctic region.1

Unlike the Southern Ocean, which is defined by a deep-ocean circumpolar belt that isolates Antarctica from warmer subtropical waters, the Arctic is largely enclosed by landmasses. This geographic configuration prevents the formation of a powerful, unobstructed current that could encircle the pole. Instead of a singular circumpolar flow, the Arctic Ocean’s surface circulation is characterized by complex patterns, including a large clockwise gyre in the Amerasia Basin and various smaller, counterclockwise gyres in the Eurasian shelf seas.213

While the Northern Hemisphere does feature cold currents—such as the Labrador Current and the East Greenland Current—these are constrained by the surrounding continents and do not form a continuous, global-scale circumpolar system.1