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
Received: 18 Jan 2009 – Published in Atmos. Chem. Phys. Discuss.: 01 Apr 2009 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.
Revised: 13 Sep 2009 – Accepted: 16 Oct 2009 – Published: 06 Nov 2009
Citation: Hopkins, J. R., Evans, M. J., Lee, J. D., Lewis, A. C., H Marsham, J., McQuaid, J. B., Parker, D. J., Stewart, D. J., Reeves, C. E., and Purvis, R. M.: Direct estimates of emissions from the megacity of Lagos, Atmos. Chem. Phys., 9, 8471-8477, doi:10.5194/acp-9-8471-2009, 2009.