用矩阵轮廓指导专家选择,提升热带降雨预报精度。
MP-MoE: Matrix Profile-Guided Mixture of Experts for Precipitation Forecasting
- 引入矩阵轮廓损失,基于序列相似性而非逐点误差
- 在越南两大流域验证,重雨事件CSI-M提升,DTW值显著降低
- 适合需要精准捕捉暴雨峰值和形态的气象预报场景
热带地区如越南的降水预报仍面临挑战,复杂地形与对流不稳定性常导致数值天气预报(NWP)模型精度受限。尽管数据驱动的后处理广泛用于缓解偏差,但现有框架多依赖逐点目标函数,在时间微小偏移下易出现“双重惩罚”问题。本文提出矩阵轮廓引导的专家混合模型(MP-MoE),将传统强度损失与结构感知的矩阵轮廓目标结合。通过利用子序列级相似性而非逐点误差,该损失能更可靠地选择专家,并减轻相位偏移带来的过度惩罚。我们在越南两个主要流域的降雨数据集上,针对1小时强度及12、24、48小时累积降雨量进行多时距评估。实验表明,MP-MoE在重雨事件的均值临界成功指数(CSI-M)上优于原始NWP与基线学习方法,同时显著降低动态时间规整(DTW)值,证明其在捕捉峰值降雨强度与保持风暴事件形态完整性方面的有效性。
原文摘要 · Abstract (English)
Precipitation forecasting remains a persistent challenge in tropical regions like Vietnam, where complex topography and convective instability often limit the accuracy of Numerical Weather Prediction (NWP) models. While data-driven post-processing is widely used to mitigate these biases, most existing frameworks rely on point-wise objective functions, which suffer from the ``double penalty'' effect under minor temporal misalignments. In this work, we propose the Matrix Profile-guided Mixture of Experts (MP-MoE), a framework that integrates conventional intensity loss with a structural-aware Matrix Profile objective. By leveraging subsequence-level similarity rather than point-wise errors, the proposed loss facilitates more reliable expert selection and mitigates excessive penalization caused by phase shifts. We evaluate MP-MoE on rainfall datasets from two major river basins in Vietnam across multiple horizons, including 1-hour intensity and accumulated rainfall over 12, 24, and 48 hours. Experimental results demonstrate that MP-MoE outperforms raw NWP and baseline learning methods in terms of Mean Critical Success Index (CSI-M) for heavy rainfall events, while significantly reducing Dynamic Time Warping (DTW) values. These findings highlight the framework's efficacy in capturing peak rainfall intensities and preserving the morphological integrity of storm events.
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