Discovery of Super-Warm Structure
Scientists have detected a massive subsurface structure of super-warm water in the Pacific Ocean, which could become a key trigger for one of the strongest El Niño events in recorded history. This is a Kelvin wave—a large disturbance in ocean currents—currently transporting abnormally warm water across the equatorial Pacific. Researchers report that temperatures within this subsurface 'warm pool' reach values approximately +7.5°C above normal for corresponding deep layers.
Impact on Climate Systems
This is an extreme anomaly for ocean systems: unlike the atmosphere, heat redistribution in deep waters is slow, so such structures can persist and intensify for months. The formation of the Kelvin wave is linked to abrupt changes in wind patterns. Specifically, westward wind bursts 'push' warm waters from the western Pacific eastward, stretching them into a long zone that gradually alters the thermal structure of the equatorial ocean.
Historical Context and Risks
Historically, such events go beyond weather changes. The strong 1877 El Niño was associated with global droughts and famine, estimated to have claimed tens of millions of lives. The 2015–2016 episode triggered cascading climate anomalies and indirectly contributed to outbreaks of infectious diseases including Zika virus, cholera, hantavirus, chikungunya, and others. The current situation differs in that the baseline temperature of the World Ocean is already significantly higher than during previous major episodes.