用深度学习预测系统在快速变化下的突变概率,提前预警气候等复杂系统的崩溃风险。
Deep Learning for predicting rate-induced tipping
- 构建深度学习模型,基于系统状态预测速率诱导突变的概率。
- 在三种典型系统中验证,可提前较长时间识别突变风险,即使存在随机扰动。
- 结合可解释AI方法,揭示突变前的早期信号,适合气候、生态等复杂系统研究者。
暴露于变化驱动力的非线性动力系统可能在不同状态间发生灾难性转变。若由分岔引起且驱动力变化缓慢,临界减速(CSD)可用于预警。但在现实场景中,驱动力变化速度常超过系统内部时间尺度,导致速率诱导突变。例如,人类活动引发的气候变化速度远超极地冰盖或大西洋经向翻转环流等地球系统组分的响应时间,构成严重风险。此外,受随机扰动影响,相同驱动力下部分轨迹可能发生突变,而另一些则不会,而基于CSD的指标通常无法区分此类噪声诱导突变与无突变情况,严重限制了突变风险评估和个体轨迹预测能力。为此,我们首次提出一种深度学习框架,用于提前预测动力系统在速率诱导突变中的转移概率。该方法在三种典型的速率诱导突变系统上进行了验证,这些系统受到时变平衡漂移和噪声扰动的影响。通过可解释人工智能方法,框架捕捉到速率诱导突变所需的早期指纹信号,即便在长提前期也有效。研究结果表明,速率诱导突变与噪声诱导突变具有可预测性,显著提升了对更广泛动力系统安全操作空间的判断能力。
原文摘要 · Abstract (English)
Nonlinear dynamical systems exposed to changing forcing can exhibit catastrophic transitions between alternative and often markedly different states. The phenomenon of critical slowing down (CSD) can be used to anticipate such transitions if caused by a bifurcation and if the change in forcing is slow compared to the internal time scale of the system. However, in many real-world situations, these assumptions are not met and transitions can be triggered because the forcing exceeds a critical rate. For example, given the pace of anthropogenic climate change in comparison to the internal time scales of key Earth system components, such as the polar ice sheets or the Atlantic Meridional Overturning Circulation, such rate-induced tipping poses a severe risk. Moreover, depending on the realisation of random perturbations, some trajectories may transition across an unstable boundary, while others do not, even under the same forcing. CSD-based indicators generally cannot distinguish these cases of noise-induced tipping versus no tipping. This severely limits our ability to assess the risks of tipping, and to predict individual trajectories. To address this, we make a first attempt to develop a deep learning framework to predict transition probabilities of dynamical systems ahead of rate-induced transitions. Our method issues early warnings, as demonstrated on three prototypical systems for rate-induced tipping, subjected to time-varying equilibrium drift and noise perturbations. Exploiting explainable artificial intelligence methods, our framework captures the fingerprints necessary for early detection of rate-induced tipping, even in cases of long lead times. Our findings demonstrate the predictability of rate-induced and noise-induced tipping, advancing our ability to determine safe operating spaces for a broader class of dynamical systems than possible so far.
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