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- W4387442938 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Associations between tropospheric ozone (O<sub>3</sub>) and climate variations have been extensively investigated worldwide. However, given the lack of historical O<sub>3</sub> monitoring data, the knowledge gaps regarding the influences of climate variations on long-term O<sub>3</sub> trends in China remain. The present study used a unique tropospheric O<sub>3</sub> dataset from the summer of 1999 to 2017 simulated by an atmospheric chemistry model to explore the linkage between summer O<sub>3</sub> and a dominant atmospheric circulation system – the Western Pacific Subtropical High Pressure (WPSH) on an interannual basis in China. During this period, both WPSH strength and O<sub>3</sub> concentrations in eastern and central China illustrated a growing trend. An EOF analysis was conducted to examine significant summer O<sub>3</sub> characteristics and patterns and their potential connections with the WPSH. We show that the WPSH determines interannual fluctuations of summer O<sub>3</sub>, whereas O<sub>3</sub> precursor emissions contribute primarily to the O<sub>3</sub> long-term trend. Special efforts were made to discern the associations of O<sub>3</sub> variations in major urban agglomerations of China and the WPSH. The results reveal that the WPSH plays a more vital role in O<sub>3</sub> perturbation in the eastern seaboard regions and inland China, but leads to lower O<sub>3</sub> levels in the Pearl River Delta (PRD) region. Precursor emissions made more significant contributions up to 60 % to increasing O<sub>3</sub> trends in the inland urban agglomerations than coastal regions in eastern and southern China. The strongest contribution of meteorological conditions associated with the WPSH to summer ozone concentration occurred in the Yangtze River Delta (YRD), accounting for over 9 % to ozone perturbations from 1999 to 2017. Overall, we find that the effect of the WPSH on regional O<sub>3</sub> depends on the spatial proximity to the WPSH. We attributed the effects of the WPSH on O<sub>3</sub> interannual variations to the changes in air temperature, precipitation, and winds associated with the WPSH’s intensity and positions." @default.
- W4387442938 created "2023-10-10" @default.
- W4387442938 date "2023-10-10" @default.
- W4387442938 modified "2023-10-10" @default.
- W4387442938 title "Comment on egusphere-2023-1373" @default.
- W4387442938 doi "https://doi.org/10.5194/egusphere-2023-1373-rc3" @default.
- W4387442938 hasPublicationYear "2023" @default.
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