Simulating regional scale secondary organic aerosol formation during the TORCH 2003 campaign in the southern UK D. Johnson, S. R. Utembe, M. E. Jenkin, R. G. Derwent, G. D. Hayman, M. R. Alfarra, H. Coe, and G. McFiggans Centre for Environmental Policy, Imperial College London, Silwood Park, Ascot, Berkshire, SL5 7PY, UK AEA Technology, 551 Harwell, Didcot, Oxfordshire, OX11 0QJ, UK School of E...