期刊
SUSTAINABLE CITIES AND SOCIETY
卷 78, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scs.2021.103643
关键词
Ozone; Urban heat island; Land use regression; Random forest; Spatial distribution
资金
- Scientific and Technological Innovation Team in Key Fields of Shaanxi Province [2020TD-029]
- Innovation Team Support Project of Central University Fund [300102411401]
- National Natural Science Foundation of China [11872295]
- Projects of International Cooperation and Exchanges NSFC [41861144021]
This study investigates the spatial distribution of ozone and urban heat island in Xi'an during summer and proposes a simultaneous control strategy using an improved land use regression model and machine learning random forest algorithm. The study reveals the spatial interactions between ozone and urban heat island and provides strategies for reducing their impact. The integrated prediction model performs better than the traditional land use regression model.
In summer, Ozone (O-3) pollution and urban heat island (UHI) pose serious health risks to humans. To obtain the spatial distributions of ozone and urban heat island in Xi'an in summer and develop a simultaneous control strategy of ozone and urban heat island, the land use regression model is modified and improved using the machine learning random forest algorithm. The LUR-Kriging-RF integrated prediction model is then established. The land use regression and kriging are used to extract the feature variables, while random forest is used to establish a regression model. The spatial distribution maps of ozone and urban heat island in Xi'an are obtained by regression mapping of the prediction model, and the spatial relationships between them are analyzed. The SHapley Additive explanation (SHAP) and partial dependence plot (PDP) are adopted to explain the way feature variables act on ozone and urban heat island. Based on the spatial distribution and interaction mode, a simultaneous control strategy of ozone and urban heat island in Xi'an is put forward. For ozone, the R-2 of the integrated prediction model (0.65) is higher than that of land use regression (0.4), while the RMSE (28.18) of the integrated model is lower than that of land use regression (35.66). For temperature, the R-2 of the integrated model (0.93) is higher than that of land use regression (0.8), while its RMSE (0.92) is lower than that of land use regression (1.52). The performance of the LUR-Kriging-RF integrated prediction model is better than that of land use regression. This study reveals the spatial interactions between ozone and urban heat island in the central urban areas. The suitable strategies for mapping ozone pollution and urban heat island control include reducing VOCs emissions from industrial sources and agricultural sources, increasing plants with low VOCs emissions, and spray humidification. This study can be used to evaluate ozone exposure and thermal exposure, provide scientific support for environmental protection and urban heat island control policies, contribute to reducing public health threats, promote the sustainability of urban environments, and promote the practical application of machine learning in this field.
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