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The contribution of particle formation to total particle concentrations is not known. We show that particle formation events can sustain mean total particle concentrations a factor of 8 greater than those resulting from anthropogenic sources of primary organic and black carbon. Global distribution of model surface level particle number in March 2003. (a) Modelled particle number with primary emissions and binary homogeneous nucleation. (b) Ratio of particle number with particle formation and primary emissions to the run with primary emissions only. (c) Model CN including only particle formation (no anthropogenic primary emissions). (d) Gas-phase sulfuric acid.

Dominick Spracklen, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT Tel: +44 113-343-7488 dominick@env.leeds.ac.uk