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Estimation of ground-level ozone concentration based on GBRT |
LI Yi-fei, QIN Kai, LI Ding, FAN Wen-zhi, HE Qin |
School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China |
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Abstract Gradient Boosting Regression Tree (GBRT) algorithm has been developed for application to the mapping of ground-based O3 concentrations in China. In this study, observations of ground-based O3 concentrations, WRF meteorological data, MODIS vegetation normalization index, elevation and population data were used to build a training prediction data set. The best feature variable of the model was selected using an inverse variable selection method. The results were evaluated using a ten-fold cross-validation method:the coefficient of determination R2=0.89and the root mean square error RMSE=4.75μg/m3. The model was used to evaluate the national O3 population exposure level. In terms of exposure intensity, the provinces in China with the highest population-weighted O3 concentration values are Shandong, Henan, Jiangsu, Hebei, and Shanghai, with an average concentration of 94.48μg/m3. In terms of exposure duration, the provinces with the highest number of non-compliant days are Henan, Shandong, Hebei, Ningxia, and Beijing, with an average percentage of 42% of thedays per year which are non-compliant.
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Received: 09 August 2019
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