Direct estimates of emissions from the megacity of Lagos
1National Centre for Atmospheric Science, University of York, YO10 5DD, UK
2School of Earth and Environment, University of Leeds, LS2 9JT, UK
3School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
4Facility for Airborne Atmospheric Measurement, Cranfield, MK43 0AL, UK
Abstract. We report here top-down emissions estimates for an African megacity. A boundary layer circumnavigation of Lagos, Nigeria was completed using the FAAM BAe146 aircraft as part of the AMMA project. These observations together with an inferred boundary layer height allow the flux of pollutants to be calculated. Extrapolation gives annual emissions for CO, NOx, and VOCs of 1.44 Tg yr−1, 0.03 Tg yr−1 and 0.37 Tg yr−1 respectively with uncertainties of +250/−60%. These inferred emissions are consistent with bottom-up estimates for other developing megacities and are attributed to the evaporation of fuels, mobile combustion and natural gas emissions.