A recent study from the University of California, Riverside reveals that a slowing Atlantic Meridional Overturning Circulation (AMOC) is expected to intensify atmospheric rivers in California by the end of the century. Published on July 8, 2026, in Nature Communications, the research highlights significant implications for storm patterns and water resources across North America.
Impact of AMOC on Storm Patterns
The AMOC functions as a vital oceanic conveyor belt, transferring warm water from the tropics to northern regions, including Europe. According to lead author Mohima Mimi, a doctoral student at UCR, the study indicates that as the AMOC weakens, it will lead to stronger storms in parts of North America, specifically along the California coast, while diminishing storm activity over Greenland.
Mimi stated, "It is well known that the AMOC is a big player in the world's climate system, and that it is slowing down. What we didn't know is exactly how the AMOC might affect atmospheric moisture and storms outside the Atlantic region." This research uncovers the profound influence of ocean currents on weather patterns thousands of miles away.
Atmospheric Rivers and Their Consequences
Atmospheric rivers are long, narrow corridors of water vapor that transport moisture from tropical regions to higher latitudes. In California, these phenomena are crucial for the state's water supply but pose risks for widespread destruction as they intensify. The study predicts an increase in atmospheric river events along the eastern coast of South America and around Antarctica, while lessening storm frequency in Greenland, reducing its snowfall and ice accumulation.
