OMI Satellite Observations of decadal changes in Ground-Level Sulfur Dioxide over North America
Shailesh K. Kharol1, Chris A. McLinden1, Christopher E. Sioris1, Mark W. Shephard1, Vitali Fioletov1, Aaron van Donkelaar2, Sajeev Philip2, and Randall V. Martin21Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada 2Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
Received: 29 Nov 2016 – Accepted for review: 01 Dec 2016 – Discussion started: 05 Dec 2016
Abstract. Sulfur dioxide (SO2) has a significant impact on the environment and human health. We estimated ground-level sulfur dioxide (SO2) concentrations from the Ozone Monitoring Instrument (OMI) using SO2 profiles from the Global Environmental Multi-scale – Modelling Air quality and CHemistry (GEM-MACH) model over North America for the period of 2005–2015. OMI-derived ground-level SO2 concentrations (r = 0.61) and trends (r = 0.74) correlated well with coincident in-situ measurements from air quality networks over North America. We found a strong decreasing trend in coincidently sampled ground-level SO2 from OMI (−81 ± 19 %) and in-situ measurements (−86 ± 13 %) over Eastern US for the period of 2005–2015, which reflects the implementation of stricter pollution control laws including flue-gas desulfurization (FGD) devices in power plants. The spatially and temporally contiguous OMI derived ground-level SO2 concentrations can be used to assess the impact of long-term exposure to SO2 on the health of humans and the environment.
Kharol, S. K., McLinden, C. A., Sioris, C. E., Shephard, M. W., Fioletov, V., van Donkelaar, A., Philip, S., and Martin, R. V.: OMI Satellite Observations of decadal changes in Ground-Level Sulfur Dioxide over North America, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1070, in review, 2016.