Predicting unobserved climate time series data at distant areas via spatial correlation using reservoir computing
This work addresses the problem of predicting climate variables at unobserved remote locations for climate change analysis, but it is incremental as it applies existing methods to spatial correlation in climate data.
The study tackled predicting near-surface temperature and pressure at distant locations using reservoir computing and vector autoregression, finding that prediction accuracy degrades with distance and that reservoir computing outperforms vector autoregression for highly correlated data within a predictive range.
Collecting time series data spatially distributed in many locations is often important for analyzing climate change and its impacts on ecosystems. However, comprehensive spatial data collection is not always feasible, requiring us to predict climate variables at some locations. This study focuses on a prediction of climatic elements, specifically near-surface temperature and pressure, at a target location apart from a data observation point. Our approach uses two prediction methods: reservoir computing (RC), known as a machine learning framework with low computational requirements, and vector autoregression models (VAR), recognized as a statistical method for analyzing time series data. Our results show that the accuracy of the predictions degrades with the distance between the observation and target locations. We quantitatively estimate the distance in which effective predictions are possible. We also find that in the context of climate data, a geographical distance is associated with data correlation, and a strong data correlation significantly improves the prediction accuracy with RC. In particular, RC outperforms VAR in predicting highly correlated data within the predictive range. These findings suggest that machine learning-based methods can be used more effectively to predict climatic elements in remote locations by assessing the distance to them from the data observation point in advance. Our study on low-cost and accurate prediction of climate variables has significant value for climate change strategies.