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AfriqAir and CAMS-Net General Meeting

7–10 Mar 2023
Carnegie Mellon University - Africa Campus, Kigali, Rwanda
Africa/Kigali timezone

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Multiyear observations of NO2 and SO2 vertical column measurements by PANDORA and TROPOMI in Dakar, Senegal

Not scheduled
2h
Carnegie Mellon University - Africa Campus, Kigali, Rwanda

Carnegie Mellon University - Africa Campus, Kigali, Rwanda
Poster Presentation Ambient air pollution Poster Session

Speaker

Demba Ndao Niang (Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Ecole Superieur Polytechnique de Dakar, Cheikh Anta Diop University, Dakar, Senegal (LPAOSF))

Description

Nitrogen dioxide (NO2) and sulfur dioxide (SO2) are primary air pollutants and ozone and secondary aerosol precursors that are emitted by vehicles, ships, powerplants, industrial processes, and other combustion sources. There is a general lack of ground-based observational data in West African cities, which has limited our understanding of the sources, relationships with human activities, and meteorological controls over NO2 and SO2. Because of this, we installed a Pandora NO2 and SO2 spectrometer on the rooftop of the Simeon Fongang Atmosphere and Ocean Physics Laboratory (LPAOSF), located on the western corniche of Dakar, Senegal in November 2019. In this study, we analyzed two years of Pandora NO2 and SO2 total columns measurements in Dakar, Senegal and compare these data with those of TROPOMI. The spatial distribution of the total column of SO2 and NO2 measured by TROPOMI showed a strong signal over the industrial area, the port and the urban area near to the Pandora site. We found diurnal, day-of-week, and seasonal patterns, which reflect anthropogenic emissions patterns, especially from local traffic and industries. We noted also that NO2 levels generally decreased during the COVID-19 shutdown period. The same thing is observed with the SO2 total column. Results showed a good agreement between the Pandora and TROPOMI with an underestimation of Pandora by a factor of two.

Author

Demba Ndao Niang (Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Ecole Superieur Polytechnique de Dakar, Cheikh Anta Diop University, Dakar, Senegal (LPAOSF))

Co-authors

Dr Mamadou Simina Drame (Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Ecole Superieur Polytechnique de Dakar, Cheikh Anta Diop University, Dakar, Senegal (LPAOSF); Department of Physics, Faculty of Science and Technology, Cheikh Anta Diop University, Dakar, Senegal;) Dr Angelique M. Dementillo (Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA) Dr Aissatou Faye (Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Ecole Superieur Polytechnique de Dakar, Cheikh Anta Diop University, Dakar, Senegal (LPAOSF), 4 Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA) Dr Elena Spinei Lind (NASA Goddard Space Flight Center, Greenbelt, MD, USA) Dr Benjamin De Foy (Earth and Atmospheric Sciences, Saint Louis University) Dr Thierno Doumbia (Aerology laboratory of Toulouse, France) Prof. Amadou Thierno GAYE (Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Ecole Superieur Polytechnique de Dakar, Cheikh Anta Diop University, Dakar, Senegal (LPAOSF)) Mrs Aminata Mbow Diokhane (Air Quality Management Center, Directorate of Environment and Classified Establishments, Ministry of Environment, Senegal) Dr Robert J. Swap (NASA Goddard Space Flight Center, Greenbelt, MD, USA) Dr Nader Abuhassan (NASA Goddard Space Flight Center, Greenbelt, MD, USA) Dr Sally Pusede (Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA)

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