Dutch scientists propose bering strait dam to stabilize atlantic currents

09:00

By: Dakir Madiha

Dutch scientists propose bering strait dam to stabilize atlantic currents

Two researchers from the Netherlands have outlined an ambitious geoengineering concept that would involve building a massive dam across the Bering Strait to prevent the collapse of the Atlantic Meridional Overturning Circulation, a key system of ocean currents that regulates global climate. The strait, which spans roughly 80 kilometers between Alaska and Siberia, would be sealed by interconnected barriers designed to alter ocean flow between the Pacific and Arctic.

The proposal is based on climate modeling conducted by doctoral researcher Jelle Soons and professor Henk A. Dijkstra of Utrecht University. Their simulations examined the effects of closing the shallow strait with a series of structures rising up to 59 meters above the seabed. In several modeled scenarios, blocking the passage stabilized the circulation system even as atmospheric carbon dioxide levels continued to increase.

The mechanism relies on preventing relatively fresh Pacific surface waters from entering the Arctic Ocean. These inflows weaken the dense and saline currents that drive the northward heat transport in the Atlantic system. By limiting this exchange, the models suggest the system could remain stable for longer, effectively extending its safe carbon threshold by an estimated 500 petagrams. However, this outcome depends on the circulation not having already weakened beyond a critical tipping point, defined as about 6 percent below its preindustrial strength.

The researchers stress that the idea remains theoretical. They describe it as a proof of concept rather than a practical blueprint. Other studies have raised concerns that closing the strait could have the opposite effect. Earlier modeling suggested such an intervention might trigger abrupt climate shifts instead of preventing them. Even within the new simulations, some scenarios showed increased vulnerability of the circulation rather than improved stability.

Timing appears to be a decisive factor. If the intervention occurs before the system weakens too far, it may help preserve stability. If implemented after a critical threshold, it could accelerate collapse. This uncertainty complicates any consideration of real world application.

Environmental and political challenges present further obstacles. The Bering Strait serves as a migration route for whales, walruses, and other marine species. Altering water flow and salinity could disrupt Arctic ecosystems on a large scale. The project would also require coordination between the United States and Russia, adding significant geopolitical complexity.

The researchers emphasize that reducing greenhouse gas emissions remains the most effective response to climate risks. They frame the dam concept as a last resort option rather than a substitute for mitigation efforts.