Overview
- Research published June 8 finds the persistent cool patch southeast of Greenland is best explained by reduced poleward ocean heat transport linked to a weakening Atlantic Meridional Overturning Circulation.
- Authors using reanalysis and multi‑decadal temperature records report the anomaly reaches roughly 1,000 metres, which points to a circulation change rather than only surface heat loss.
- Scientists propose Greenland meltwater has freshened surface waters, cut deep‑water formation south of Greenland, and thus weakened the ocean conveyor that carries warm water north.
- A sustained AMOC slowdown could make northwest European winters colder and longer, shift rainfall in the Sahel and Asian monsoon regions, and raise sea levels along parts of North America, but the size and timing of those effects are uncertain.
- Researchers caution that direct AMOC observations are limited and alternative causes such as wind‑driven heat loss, cloud changes, or other current shifts remain possible, so expanded observations and modelling are needed to confirm trends and project impacts.