Weakening Atlantic Conveyor Could Reshape Global Weather, Threatening California
A Nature Communications study finds that human-caused warming is slowing the Atlantic Meridional Overturning Circulation (AMOC), with a possible near-future collapse. Using NASA data and climate models, researchers project that a weaker AMOC would alter atmospheric moisture and storms globally, intensifying North American—especially California—storms by the end of the century while reducing them in Greenland and the Arctic. Atmospheric rivers, the moisture-dense air streams that drive much of California’s rainfall, could become more frequent and wetter, increasing flood risk in some regions and changing water resources; ARs may also transport more moisture to the Southern Hemisphere and accelerate Antarctic ice melt. The greatest increases in AR activity are expected along North America’s West Coast, from Baja California to Alaska, while Arctic regions could see fewer ARs as the jet stream shifts. However, the outcome depends on future greenhouse gas emissions, making the scenario not guaranteed. The research highlights how a single major ocean current can ripple across global climate patterns and emphasizes potential adaptation, such as restoring landscapes to capture more water in drought-prone areas.
