How does the Lomonosov Ridge divide the Arctic Ocean?

The Lomonosov Ridge is a major submarine mountain range in the Arctic Ocean that extends 1,100 miles (1,770 km) from the continental shelf off Ellesmere Island to the New Siberian Islands.12

This ridge serves as a primary topographic feature that divides the Arctic Ocean into two physiographically complex, deep-water basins:2

• Eurasia Basin: Located on the European side of the ridge, this basin is further subdivided by the Nansen-Gakkel Ridge.2
• Amerasia Basin: Located on the American side of the ridge, this basin is further divided into smaller subbasins, such as the Makarov and Canada basins, by the Alpha Cordillera.2

By acting as a physical barrier, the Lomonosov Ridge significantly influences water circulation, marine life, and ice movement within the Arctic Ocean. For instance, deeper Atlantic water enters the Amerasia Basin by flowing over the crest of the ridge.13