Ancient Sediments Reveal Unexpected Resilience in Atlantic Circulation System

August 6, 2026

Seafloor sediments from 3.4 million years ago show that despite a near-shutdown of warm, salty water flow from the Indian Ocean into the Atlantic, the Atlantic Meridional Overturning Circulation (AMOC) did not weaken as anticipated.

Historically, scientists believed that disruptions in this critical oceanic 'lifeline' would significantly impact global climate patterns by weakening the AMOC.

However, these findings suggest a more complex and resilient system than previously understood, with parts of the circulation actually strengthening during periods of reduced warm water inflow.

Read the full article here:

The AMOC stayed strong even as a major ocean “lifeline” nearly shut down

Ancient seafloor sediments have revealed a surprising twist in how the Atlantic’s massive circulation system works. During a cold period about 3.4 million years ago, the flow of warm, salty water from the Indian Ocean into the Atlantic nearly shut down—but the AMOC did not weaken as expected. Parts of the overturning circulation actually grew stronger.