Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 12 2009 10.5194/acp-9-3841-2009 http://www.atmos-chem-phys.net/9/3841/2009/ http://www.atmos-chem-phys.net/9/3841/2009/acp-9-3841-2009.html http://www.atmos-chem-phys.net/9/3841/2009/acp-9-3841-2009.pdf 3841 3850 2009-06-15 Secondary organic aerosol from biogenic VOCs over West Africa during AMMA G. Capes gerard.capes@manchester.ac.uk J. G. Murphy C. E. Reeves J. B. McQuaid J. F. Hamilton J. R. Hopkins J. Crosier P. I. Williams H. Coe Centre For Atmospheric Science, S. E. A. E. S., University Of Manchester, UK School of Environmental Sciences, University of East Anglia, Norwich, UK Institute for Climate and Atmospheric Science, S. E. E., University of Leeds, Leeds, UK Department of Chemistry, University of York, York, N. Yorkshire, UK now at: University of Toronto, Canada This paper presents measurements of organic aerosols above subtropical West Africa during the wet season using data from the UK Facility for Airborne Atmospheric Measurements (FAAM) aircraft. Measurements of biogenic volatile organic compounds (BVOC) at low altitudes over these subtropical forests were made during the African Monsoon Multidisciplinary Analysis (AMMA) field experiment during July and August 2006 mainly above Benin, Nigeria and Niger. Data from an Aerodyne Quadrupole Aerosol Mass Spectrometer show a median organic aerosol loading of 1.07 μg m^−3 over tropical West Africa, which represents the first regionally averaged assessment of organic aerosol mass (OM) in this region during the wet season. This is broadly in agreement with global model predictions based on partitioning schemes, although there are large uncertainties associated with such estimates. 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