A031-0008
Results from One Year of Pandora Nitrogen Dioxide Measurements in Dakar, Senegal

Tuesday, 8 December 2020
Poster
Demba Niang1, Mamadou simina Drame1, Mary Angelique G Demetillo2, Sally Pusede2, Aissatou Faye2, Elena Spinei Lind3, Robert Swap4, Nader Abuhassan4 and Lena Shalaby4, (1)Laboratory of Atmospheric-Ocean Physics Simeon Fongang, Cheikh Anta Diop University, Dakar, Senegal, (2)University of Virginia, Environmental Sciences, Charlottesville, VA, United States, (3)Virginia Polytechnic Institute and State University, Electrical and Computer Engineering, Blacksburg, VA, United States, (4)NASA Goddard Space Flight Center, Greenbelt, MD, United States
Abstract:
Sustained population growth, high urbanization rates, and growth in transport and industrial activities have contributed to poor air quality in major West African cities, including Dakar, Senegal. At the same time, there is a general lack of ground-based observational data, which has limited our understanding of the sources, relationships with human activities, and meteorological controls over urban air pollutants such as nitrogen dioxide (NO2). Because of this we installed a Pandora spectrometer instrument (SciGlob Inc.) on the rooftop of the Simeon Fongang Atmosphere and Ocean Physics Laboratory (LPAOSF), located on the western cornice of Dakar, Senegal. In this work, we describe the first year of direct-sun NO2 column measurements (December 2019–November 2020) and use these data to characterize local temporal variability in NO2 total columns on diurnal to seasonal timescales, including COVID-19 related shutdown. We investigate anthropogenic emission patterns by comparing NO2 column differences on working and rest days.". Finally, we compare observations from the LPAOSF Pandora with TROPOMI to better interpret the space-based observations over coastal cities like Dakar.
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