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arXiv 2404.03310physics.ao-phcs.LG
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利用可解释且可靠的机器学习进行站点特定的确定性温度和湿度预报

Site-specific Deterministic Temperature and Humidity Forecasts with Explainable and Reliable Machine Learning

Bureau of Meteorology(气象局)

MengMeng Han, Tennessee Leeuwenburg, Brad Murphy

AI总结:

针对NWP网格预报难以匹配局地站点的问题,本文基于XGBoost构建Multi-SiteBoost框架,融合历史NWP与站点观测预测澳大利亚多站点温度和露点,并用SHAP提升可解释性与可靠性。

摘要:

站点特定的天气预报对于准确预测电力需求至关重要,因此受到能源运营商的高度关注。然而,当前数值天气预报(NWP)模型的预报缺乏精细尺度的细节,无法捕捉现实世界局地站点的所有重要特征。相反,它们提供的是代表矩形网格单元(通常尺度为数公里)的天气信息。即使经过后处理和偏差校正,区域平均信息通常对于特定站点也并非最优。以往关于站点优化预报的工作主要集中在线性方法、加权共识平均、时间序列方法等方面。机器学习(ML)的最新发展促使人们越来越关注将ML作为解决该问题的新途径。在本研究中,我们调查了通过采用流行的机器学习模型梯度提升决策树来优化站点预报的可行性,该模型由Python版本的XGBoost软件包提供支持。研究以历史NWP数据和站点观测数据作为训练数据训练回归树,旨在预测澳大利亚多个站点位置的温度和露点。我们开发了一个名为“Multi-SiteBoost”的可用ML框架,初步测试结果表明,与经偏差校正的NWP模型得到的网格值相比,其性能有显著提升。研究发现,XGBoost带来的改进与文献中报道的非ML方法相当。借助SHapley Additive exPlanations(SHAP)提供的洞见,本研究还测试了多种方法,以理解ML预测并提高ML所生成预报的可靠性。

英文摘要:

Site-specific weather forecasts are essential to accurate prediction of power demand and are consequently of great interest to energy operators. However, weather forecasts from current numerical weather prediction (NWP) models lack the fine-scale detail to capture all important characteristics of localised real-world sites. Instead they provide weather information representing a rectangular gridbox (usually kilometres in size). Even after post-processing and bias correction, area-averaged information is usually not optimal for specific sites. Prior work on site optimised forecasts has focused on linear methods, weighted consensus averaging, time-series methods, and others. Recent developments in machine learning (ML) have prompted increasing interest in applying ML as a novel approach towards this problem. In this study, we investigate the feasibility of optimising forecasts at sites by adopting the popular machine learning model gradient boosting decision tree, supported by the Python version of the XGBoost package. Regression trees have been trained with historical NWP and site observations as training data, aimed at predicting temperature and dew point at multiple site locations across Australia. We developed a working ML framework, named 'Multi-SiteBoost' and initial testing results show a significant improvement compared with gridded values from bias-corrected NWP models. The improvement from XGBoost is found to be comparable with non-ML methods reported in literature. With the insights provided by SHapley Additive exPlanations (SHAP), this study also tests various approaches to understand the ML predictions and increase the reliability of the forecasts generated by ML.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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