Overview
- A study published in June 2026 in Geophysical Research Letters finds that the decades‑long cooling patch south of Iceland and Greenland is driven mainly by a decline in ocean heat transport rather than by local surface heat loss.
- The analysis combined satellite records, buoys, ship observations and climate reanalyses to show the region’s heat content has fallen through the full water column, not only at the surface.
- Authors and commentators interpret the change as strong evidence that the Atlantic Meridional Overturning Circulation (AMOC) is weakening because less warm water is reaching the North Atlantic.
- Researchers stress large uncertainties remain about the size, timing and future path of AMOC change and say those unknowns make it urgent to expand targeted observations and improve climate models.
- If the AMOC continues to weaken, scientists warn it could alter European temperatures and rainfall patterns, change sea level regionally and create broader climate impacts that would affect livelihoods and infrastructure.