Tropospheric Ozone Perturbations Induced by Urban Land Expansion in China from 1980 to 2017 br

Urbanization perturbs air pollutants from a dynamic andthermodynamic perspective, which has inspired extensive investigations in Chinadue to rapid urban land expansion in the past four decades. However, knowledgegaps remain in the long-term and nationwide responses to air pollutants tourbanization. The evolution of tropospheric ozone associated with urban landexpansion across China was assessed from 1980 to 2017 using a coupled WRF-Chem model based on a recently updated land use change (LUC) data set. Theresults revealed that urban-land expansion drove growing ozone trends for thisperiod and contributed about 3-9% to its summer maximum concentrations duringthe 2010s in major urban agglomerations across China. The association between along-term change in summer O3concentrations and LUC after excluding the effectof precursor emissions and meteorological conditions and causes of interannual(short-term) variations in O3concentrations induced by urban-land expansion werealso explored by examining the relationships between ozonefluctuations and meteorological variables.