Ancient clam shells help scientists study ocean currents’ stability

Scientists are using centuries-old clam shells to study the Atlantic Ocean’s circulation system, which could face collapse due to climate change.

Sarah Kaplan reports for The Washington Post.

In short:

• The Atlantic Meridional Overturning Circulation (AMOC), vital for global climate regulation, could shut down due to warming and Greenland ice melt.
• Arctica clam shells, which record centuries of oceanic conditions, provide new insights into past changes in AMOC and potential future tipping points.
• Researchers warn the AMOC is showing signs of instability that could have significant global impacts, including extreme weather and sea level rise.

Key quote:

“You can tell it is losing stability. The environment is really struggling to maintain equilibrium.”

— Beatriz Arellano-Nava, climate researcher at the University of Exeter

Why this matters:

The AMOC’s collapse could lead to severe weather disruptions, coastal flooding and agricultural instability, affecting billions of people. Studying clams’ ancient records offers a rare glimpse into the ocean’s history, helping scientists predict and potentially mitigate future climate crises.

Learn more: Scientists predict collapse of key Atlantic Ocean current by 2057