The Deep Origin of El Niño Phenomenon: Earth's Internal Energy Release Model Based on Light String Theory and Design of Crucial Experiments

El Niño-Southern Oscillation (ENSO) is the most significant interannual oscillation phenomenon in the Earth’s climate system, yet its fundamental energy source and triggering mechanism remain controversial. Mainstream theories attribute ENSO to atmosphere–ocean coupling processes, including trade wind weakening, anomalous Walker circulation, and equatorial Kelvin waves, but cannot explain the enormous energy required to drive large-scale seawater temperature anomalies. The interannual variation of solar radiation and the thermal contribution of anthropogenic greenhouse gases are far insufficient to support the observed magnitude of ENSO sea surface temperature anomalies.Based on the first principle unified theory of light strings, this paper proposes a new physical mechanism: El Niño is triggered by periodic energy release from the focal point of the Earth’s internal light string field located at the core–mantle boundary. When the accumulated light string field energy density exceeds the critical threshold, internal energy is released through submarine volcanic eruptions and geothermal anomalies, directly heating the equatorial Pacific seawater and triggering global atmospheric responses.This study establishes a complete causal chain of internal energy accumulation, submarine geothermal activity, sea temperature anomalies, and atmospheric oscillation. Five quantitative physical predictions and four low-cost crucial experimental schemes are designed, all of which can be verified using existing public observational datasets. If confirmed, the model will reshape the theoretical foundation of climatology and provide a new physical framework for long-term climate prediction.