Diffusion Models Bridge Deep Learning and Physics in ENSO Forecasting

TL;DR

This paper introduces a diffusion model-based approach for ENSO forecasting that improves lead times, captures early signals, reproduces extreme events, and reveals underlying physical mechanisms consistent with classical oscillatory models.

Contribution

It presents a novel probabilistic diffusion model for ENSO prediction that bridges data-driven methods with physical dynamical systems, enhancing accuracy and interpretability.

Findings

Extends lead times of current methods

Resolves early development signals of ENSO

Reproduces spatiotemporal evolution of extreme events

Abstract

Accurate long-range forecasting of the El \Nino-Southern Oscillation (ENSO) is vital for global climate prediction and disaster risk management. Yet, limited understanding of ENSO's physical mechanisms constrains both numerical and deep learning approaches, which often struggle to balance predictive accuracy with physical interpretability. Here, we introduce a data driven model for ENSO prediction based on conditional diffusion model. By constructing a probabilistic mapping from historical to future states using higher-order Markov chain, our model explicitly quantifies intrinsic uncertainty. The approach achieves extending lead times of state-of-the-art methods, resolving early development signals of the spring predictability barrier, and faithfully reproducing the spatiotemporal evolution of historical extreme events. The most striking implication is that our analysis reveals that the reverse diffusion process inherently encodes the classical recharge-discharge mechanism, with its operational dynamics exhibiting remarkable consistency with the governing principles of the van der Pol oscillator equation. These findings establish diffusion models as a new paradigm for ENSO forecasting, offering not only superior probabilistic skill but also a physically grounded theoretical framework that bridges data-driven prediction with deterministic dynamical systems, thereby advancing the study of complex geophysical processes.