Ozone Pollution over China and India: Seasonality and Sources Institutional Repository Document uri icon

abstract

  • Abstract. A regional fully coupled meteorology-chemistry Weather Research and Forecasting model with Chemistry (WRF-Chem) was employed to study the seasonality of ozone (O3) pollution and its sources in both China and India. Observations and model results suggest that O3 in the North China Plain (NCP), Yangtze River Delta (YRD), Pearl River Delta (PRD) and India exhibit distinctive seasonal features, which are linked to the influence of summer monsoons. Through a factor separation approach, we examined the sensitivity of O3 to individual anthropogenic, biogenic, and biomass burning emissions. We found that summer O3 formation is more sensitive to industrial sources than to other source sectors for China, while the transport vehicle sector is more important in all seasons for India. For India, in addition to transport, the residential sector also plays an important role in winter when O3 concentrations peak. Tagged simulations suggest that sources in east China play an important role in the formation of the summer O3 peak in the NCP, but sources from Northwest China should not be neglected to control summer O3 in the NCP. For the YRD region, prevailing winds and cleaner air from the ocean in summer lead to reduced transport from polluted regions, and the major source region in addition to local sources is Southeast China. For the PRD region, the upwind region is replaced by contributions from polluted east China as autumn approaches, leading to an autumn peak. The major upwind regions in autumn for the PRD are YRD (11%) and Southeast China (10%). For India, sources in North India are more important than sources in the south. These analyses emphasize the relative importance of source sectors and regions as they change with seasons, providing important implications for O3 control strategies.

altmetric score

  • 1.75

author list (cited authors)

  • Gao, M., Gao, J., Zhu, B., Kumar, R., Lu, X., Song, S., ... McElroy, M. B.

citation count

  • 4

complete list of authors

  • Gao, Meng||Gao, Jinhui||Zhu, Bin||Kumar, Rajesh||Lu, Xiao||Song, Shaojie||Zhang, Yuzhong||Wang, Peng||Beig, Gufran||Hu, Jianlin||Ying, Qi||Zhang, Hongliang||Sherman, Peter||McElroy, Michael B

Book Title

  • EGUsphere

publication date

  • November 2019