PREDICTION OF PM2.5 AND OZONE CONCENTRATION BASED ON VMD-CEEMD DECOMPOSITION AND LSTM
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摘要: 针对现有PM2.5和O3预测模型精度不高的问题,基于南京市2015-01-01-2021-06-30期间的PM2.5和O3日平均浓度数据,构建了一种互补集合经验模态分解(CEEMD)二次分解和长短期记忆神经网络(LSTM)的污染物浓度预测模型。通过变分模式分解(VMD)将污染物浓度序列进行一次分解,利用分解后的残余分量进行CEEMD二次分解,再将分解后的所有子序列通过LSTM进行预测,最后将输出结果重构得到最终结果。结果表明:在南京市场景下进行预测时,与3种比较模型相比,所提出的模型具有优越性和便捷性,其O3和PM2.5浓度的RMSE分别为16.47、5.12。该研究结果可为分析O3和PM2.5污染趋势提供参考。Abstract: Accurate prediction of ozone and PM2.5 concentration can provide a scientific basis for the prevention and control of photochemical pollution. However, the prediction accuracy of the existing ozone and PM2.5 concentration prediction models is still not sufficient. Based on the daily average ozone and PM2.5 concentration data in Nanjing from January 1, 2015, to June 30, 2021, a pollutant concentration prediction model for complementary ensemble empirical mode decomposition (CEEMD) secondary decomposition and long and short-term memory neural network (LSTM) was constructed. Firstly, the ozone and PM2.5 concentration sequence was decomposed by variational mode decomposition (VMD). Secondly, the CEEMD secondary decomposition was used with residual components, and then all the decomposed subsequences were predicted by LSTM. Finally, the output result was reconstructed to get the final result. The results showed that for the forcast of PM2.5 and O3 concentration in Nanjing, comparing with the other models, the model VMD-CEEMD-LSTM proposed in this paper was superior and robust, with the RMSE of ozone and PM2.5 concentrations of 16.47 and 5.12, respectively. This study could provide valuable references for analyzing ozone and PM2.5 pollution trend.
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