Why is the Bering Strait important to Arctic Ocean circulation?

The Bering Strait serves as a vital, albeit shallow, gateway for water exchange between the North Pacific and the Arctic Ocean. Its importance to Arctic circulation includes the following factors:12

• Inflow of Pacific Water: The strait allows for the entry of relatively low-salinity, warmer Pacific water into the Arctic Ocean. This inflow is primarily driven by a slight sea-level difference between the North Pacific and the Arctic, with significant variability influenced by large-scale atmospheric circulation over the North Pacific.31
• Water Mass Modification: Once this Pacific water enters the Chukchi Sea, it mixes with colder, more saline waters. This process alters its density, allowing it to flow as a distinct wedge between the Arctic and Atlantic water layers within the Amerasia Basin.1
• Circulation Dynamics: While the bulk of water in the Bering Sea returns to the Pacific, the portion that passes through the strait contributes to the overall water balance and circulation patterns of the Arctic Basin.32

This exchange is a key component of the Arctic's complex oceanographic structure, which is otherwise largely defined by its connection to the Atlantic Ocean.1