Historic Pacific Ocean Heat Triggers Warnings for Record-Breaking El Niño Event

The Niño 3.4 region in the central-equatorial Pacific recorded a sea surface temperature of 30.06 degrees Celsius on October 5, marking the first time in recorded history that the area exceeded 30 degrees. Daily temperatures in the region have been breaking records as the world's oceans beyond the poles reached an average surface temperature of 21.18 degrees Celsius on August 22. The U.S. NOAA Climate Prediction Center estimates an 83% chance of a strong to very strong El Niño. The ongoing event was declared on June 6 and is projected to peak in December with a seasonal temperature anomaly of 3.8 degrees Celsius.

Expert Views And Past Data

Raghu Murtugudde, an earth system scientist, emeritus professor at the University of Maryland and visiting professor at IIT Kanpur, noted that stronger El Niño events generally lead to stronger impacts. A recent coral study led by University of Michigan professor Julia Cole shows that the El Niño system's intensity has grown much greater over the last 40 years compared to pre-industrial times. Meteorological agencies classify an El Niño using the 90-day average of the temperature anomaly in the Niño 3.4 region. Since instrumental records began in the 1980s, roughly a dozen significant events have occurred, with only three classified as very strong: 2015-16 at 2.6 degrees Celsius, 1997-98 at 2.4 degrees Celsius, and 1982-83 at 2.1 degrees Celsius.

Context

El Niño is a natural climate pattern returning every two to seven years that releases stored ocean heat and alters global weather patterns. While scientists expect 2027 to be even warmer than 2026 due to this heat release, its exact effect on regional monsoons remains complex and tied to broader global warming trends.