Why There Will Be No El Niño in 2025 ✛ ✎

Original: "Climate network and complexity approach predict neutral ENSO event for 2025"
arXiv:2502.00643 · 2025-01-19 · arXiv non-exclusive · independent analysis · 1 min
Two independent methods say: the warm phase of the Pacific will not begin in 2025.

The Pacific Ocean is like a vast network of nerve endings that warns of an impending attack a year in advance. El Niño is the warm phase of temperature oscillations in the Pacific. When it arrives, the whole planet warms up. In 2023–2024, El Niño pushed temperatures to a record high. Now two independent methods, like two doctors, look at the symptoms and say: no attack in 2025.

The first method examines how temperatures at different points in the ocean are connected. If the connections become strong, it resembles nerves starting to fire before an attack. In 2024, the connections remained weak. The second method measures how chaotic temperature changes are. Before El Niño, chaos usually increases, but now it is low. Both methods give a probability of about 91% that El Niño will not start in 2025.

Since 1981, the network method has predicted 9 El Niños, and all 9 times it was correct.

This means the year will most likely be neutral, and the global temperature will drop slightly after the record 2024. For farmers, energy managers, and water managers, this is good news: they can plan the year with more confidence.

Since 1981, the strict version of the network algorithm has issued 9 El Niño warnings, and all 9 were correct. Not a single false alarm.

SysSampEn(m, p, l_{eff}, \gamma) = -\log\left(\frac{A}{B}\right)
Negative logarithm of the ratio of the number of similar subsequence pairs of length m+p to the number of pairs of length m; measures complexity (disorder) in temperature series.
Concepts
ENSO El Niño-Southern Oscillation La Niña spring predictability barrier El Niño index Multivariate ENSO Index ERSST Jin-Timmermann model relative ONI recharge oscillator model Southern Oscillation NOAA CPC Warm water volume TAO/TRITON moorings natural variability interannual variability climate network equatorial wave propagation North Equatorial Countercurrent seasonal cycle