上海市PM<sub>2.5</sub>浓度延伸期预测模型的构建及评估

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Abstract In this study, two newly developed long short-term memory (LSTM) model and Light Gradient Boosting Machine (LGBM) algorithms were introduced for application in extended-range forecasting of PM_2.5 in Shanghai by incorporating three members of the sub-seasonal-to-seasonal prediction project (S2S) forecasting, six prediction models were obtained. Therefore, based on six models forecast results, an accurate ~40d PM_2.5 prediction fusion model over Shanghai was developed by LSTM algorithm, providing new insights for air pollution extended-range forecasting. The evaluation results indicated the fusion model exhibited not only much better accuracy but also captured the pollution process more closely compared to than any of the six single model. The correlation coefficients for the fusion model forecasts on lead times of 11~40 days ranged from 0.47 to 0.76, 23.5%~31.1% higher than other six single model. The root mean square errors (RMSE) for the fusion model forecasts on lead times of 11~40 days ranged from 19 to 25.1µg/m³, 19%~19.3% lower than other six single model. The fusion model could not only better predict the overall trend of PM_2.5 concentration, but also the occurrence time of peak and valley, and its Heidke Skill Scores (HSS) was between 0.18 and 0.5, showing a good prediction skill. The fusion model could predict pollution episodes at a lead of 11~40 days, and the overall prediction accuracy was 75.5% at a lead of 11~40 days. For three pollution episodes lasting for 3 days or more, the prediction accuracy reached 100% at a lead of 11~40 days .The prediction efficiency of the fusion model was up to 40days, nearly four times that of the current pollution numerical prediction model (generally 96~240h), and the calculation speed was fast, which could save a lot of computing resources and time costs.

Key words： machine learning S2S PM_2.5 extended range prediction

Received: 29 November 2022

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X513

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	MA Jing-hui
	QU Yuan-hao
	YU Zhong-qi
	XU Jian-ming

Cite this article:

MA Jing-hui,QU Yuan-hao,YU Zhong-qi等. Establishment and evaluation of prediction model for PM_2.5 concentration extension period in Shanghai[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3290-3298.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3290

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