Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 21 2009 10.5194/acp-9-8471-2009 http://www.atmos-chem-phys.net/9/8471/2009/ http://www.atmos-chem-phys.net/9/8471/2009/acp-9-8471-2009.html http://www.atmos-chem-phys.net/9/8471/2009/acp-9-8471-2009.pdf 8471 8477 2009-11-06 Direct estimates of emissions from the megacity of Lagos J. R. Hopkins M. J. Evans mat@env.leeds.ac.uk J. D. Lee A. C. Lewis J. H Marsham J. B. McQuaid D. J. Parker D. J. Stewart C. E. Reeves R. M. Purvis National Centre for Atmospheric Science, University of York, YO10 5DD, UK School of Earth and Environment, University of Leeds, LS2 9JT, UK School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK Facility for Airborne Atmospheric Measurement, Cranfield, MK43 0AL, UK 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, NO_x, 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. Baumbach, G., Vogt, U., Hein, K. R. G., Oluwole, A. F., Ogunsola, O. J., Olaniyi, H. B., and Akeredolu, F. A.: Air pollution in a large tropical city with a high traffic density – results of measurements in Lagos, Nigeria, Sci. Total. Environ., 169(1–3), 25–31, 1995. Bey I., Jacob, D. J., Yantosca, R. M., Logan, J. A., Field, B., Fiore, A. M., Li, Q., Liu, H., Mickley, L. J., and Schultz, M.:Global modeling of tropospheric chemistry with assimilated meteorology: Model description and evaluation, J. Geophys. Res., 106, 23073–23096, 2001. Brough, N., Reeves, C. E., Penkett, S. A., Stewart, D. J., Dewey, K., Kent, J., Barjat, H., Monks, P. S., Ziereis, H., Stock, P., Huntrieser, H., and Schlager, H.: Intercomparison of aircraft instruments on board the C-130 and Falcon 20 over southern Germany during EXPORT 2000, Atmos. Chem. Phys., 3, 2127–2138, 2003. Butler, T. M., Lawrence, M. G., Gurjar, B. R., van Aardenne, J., Schultz, M., and Leliveld, J.: The representation of emission from megacities in global emissions inventories, Atmos. Environ., 42, 703–719, 2008. Carson, D. J.: Development of a dry inversion-capped convectively unstable boundary layer, Q. J. R. Met. Soc., 99, 421, 450–467, 1973. Gerbig, C., Schmitgen, S. Kley, D., Volz-Thomas, A., Dewey, K., and Haaks,D.: An improved fast-response vacuum-UV resonance fluorescence CO instrument, J. Geophys. Res., 104(D1), 1699–1704, 1999. Gurjar, B. R. and Lelieveld, J.: New Directions: Megacities and global change, Atmos. Environ., 39(2), 391–393, 2005. Guttikunda, S. K., Tang, Y. H., Carmichael, G. R., Kurata, G., Pan, L., Streets, D. G., Woo, J. H., Thongboonchoo, N., and Fried, A.: Impacts of Asian megacity emissions on regional air quality during spring 2001, J. Geophys. Res., 110(D20), D20301, 2005. Hopkins, J. R., Lewis, A. C., and Read, K. A.: A two-column method for long-term monitoring of non-methane hydrocarbons (NMHCs) and oxygenated volatile organic compounds (o-VOCs), J. Environ. Monit., 5(1), 8–13, 2003. Jenkin, M. E, Murrells, T. P., and Passant, N. R.: The Temporal Dependence of Ozone Precursor Emissions: Estimation and Application, Report to the UK Dept., Energy Trade and the Regions, Air and Environmental Quality Division, AEAT/R/ENV/0355, available from: http://www.naei.org.uk/reports.php, 2000. Jobson, B. T., Berkowitz, C. M., Kuster, W. C., Goldan, P. D., Williams, E. J., Fesenfeld, F. C., Apel, E. C., Karl, T., Lonneman, W. A., and Riemer D.: Hydrocarbon source signatures in Houston, Texas: Influence of the petrochemical industry, J. Geophys. Res., 109(D24), D24305, 2004. Lawrence, M. G., Butler, T. M., Steinkamp, J., Gurjar, B. R., and Lelieveld, J.: Regional pollution potentials of megacities and other major population centers, Atmos. Chem. Phys., 7, 3969–3987, 2007. Makama, S. D.: Population and Development Review, Vol. 33, 1, 206–210, 2007. Mattai, J. and Hutchinson, D.: London Atmospheric Emissions Inventory 2003, Second Report, Greater London Authority, City Hall, London, SE1 2AA, 2006. Neuman, J. A., Parrish, D. D., Trainer, M., Ryerson, T. B., Holloway, J. S., Nowak, J. B., Swanson, A., Flocke, F., Roberts, J. M., Brown, S. S., Stark, H., Sommariva, R., Stohl, A., Peltier, R., Weber, R., Wollny, A. G., Sueper, D. T., Hubler, G., Fehsenfeld, F. C.: Reactive nitrogen transport and photochemistry in urban plumes over the North Atlantic Ocean, J. Geophys. Res., 111, D23S54, doi:10.1029/2005JD007010, 2006. Oketola, A. A. and Osibanjo, O.: Estimating sectoral pollution load in Lagos by Industrial Pollution Projection System (IPPS), Sci. Total. Environ., 377, 125–141, 2007. Otter, L., Guenther, A., Wiedinmyer, C., Fleming, G., Harley, P., and Greenberg, J. P: Spatial and temporal variations in biogenic volatile organic compound emissions for Africa south of the equator, J. Geophys. Res., 108(D13), 8505, doi:10.1029/2002JD002609, 2003. Redelsperger, J.-L., Thorncroft, C. D., Diedhiou, A., Lebel, T., Parker, D. J., and Polcher, J.: African Monsoon Multidisciplinary Analysis: An International Research Project and Field Campaign, Bull. Am. Met. Soc. 87, 1739–1746, 2006. Streets, D. G., Bond, T. C., Carmichael, G. R., Fernandes, S. D., Fu, Q., He, D., Klimont, Z., Nelson S. M., Tsai, N. Y., Wang, M. Q., Woo, J. H., Yarber, K. F.: An inventory of gaseous and primary aerosol emissions in Asia in the year 2000, J. Geophys. Res., 108(D21), 8809, doi:10.1029/2002JD003093, 2003. Streets, D. G., Zhang, Q., Wang, L., He, K., Hao, J., Wu, Y., Tang, Y., and Carmichael, G. R.: Revisiting China's CO emissions after the Transport and Chemical Evolution over the Pacific (TRACE-P) mission: Synthesis of inventories, atmospheric modeling, and observations, J. Geophys. Res., 111, D14306, doi:10.1029/2006JD007118, 2006. UN: World Population Prospects: The 2005 Revision, Vol I, Comprehensive Tables (United Nations publication, Sales No. E.05.XIII.5), ESA/P/WP/2005, www.un.org/esa/population/publications/WUP2005/2005wup.htm, 2005.