A Critical Ocean Current System May Be Unraveling Faster Than We Thought

Key Points:

• A new study published in Science Advances warns that the Atlantic Meridional Overturning Circulation (AMOC) is projected to slow down by 43% to 58% by 2100, a rate 60% higher than previous climate model averages.
• The AMOC is a crucial ocean current system that redistributes heat from the tropics to the Arctic, playing a vital role in regulating Earth's climate; its collapse would cause severe regional climate impacts including sea level rise, extreme storms, and shifts in rainfall patterns.
• Historical evidence shows the AMOC collapsed at the end of the last ice age due to freshwater influx, causing rapid climate changes, and recent data indicates a similar weakening trend linked to human-driven climate change.
• Researchers used observational constraints to refine climate model projections, finding with 90% probability that the AMOC will weaken by about 50% by century’s end, supporting the more pessimistic models as realistic.
• Growing scientific consensus warns that continued climate change could push the AMOC to a tipping point leading to its collapse, with potentially catastrophic consequences for the Americas, Europe, and Africa.