Multiple Fractal Difference Analysis of NO2-O3 Role in Urban and Suburban Areas
In order to quantitatively reveal the differential effects of O3 precursors on O3 production in urban and suburban ar-eas,the multi-scale characteristics of NO2-O3 intercorrelation at different sites in urban and suburban areas of 15 key cities in Sichuan Province from 2016 to 2022 were compared based on the multiple fractal detrended correlation analysis and K-means clustering algorithm.The results show that the atmospheric NO2-O3 intercorrelations in urban and suburban areas are character-ized by multi-fractality and long-term persistence,and the intensity of multi-fractality at suburban sites is significantly higher than that in urban areas.The differences in the NO2-O3 correlations between urban and suburban areas showed a yearly in-creasing pattern,and were affected by the seasons,with the largest differences between urban and suburban areas in summer and the smallest ones in winter,which were mainly influenced by the emission characteristics of O3 precursors and the heat is-land effect.The study of NO2 and O3 inter-correlation multiple fractal variation patterns provides a new perspective to under-stand the differences in the characteristics and formation mechanisms of air pollution in urban and suburban areas,and provides new parameters for the improvement of the refined prediction model of O3 in urban and suburban areas.
ozonenitrogen dioxidemultifractalK-means clusteringurban heat island effect
NETL
NSTL
万方数据
