Galápagos coral record reveals climate change has intensified El Niño by nearly 40%

A new analysis of coral samples from the Galápagos Islands indicates that El Niño events have grown roughly 40% stronger since the preindustrial era. The findings point to climate change as a direct amplifier of the ocean-atmosphere phenomenon, potentially driving more extreme global weather. Researchers describe the evidence as unusually straightforward, linking human-caused warming to a measurable shift in natural climate variability.

Coral skeletons function as natural oceanographic archives, preserving chemical signatures of sea-surface temperature and salinity within their growth bands. By analyzing ancient coral from the Galápagos, researchers can reconstruct past El Niño behavior far beyond the limited span of instrumental records, offering a long-term baseline against which modern events can be compared. The study's conclusion that human-driven warming has amplified El Niño intensity by roughly 40% since preindustrial times suggests that the phenomenon's natural variability is no longer operating within its historical range. Because El Niño redistributes heat and moisture across the Pacific, its strengthening carries implications for marine ecosystems, coastal communities, and global atmospheric circulation patterns that scientists are only beginning to quantify.