Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-5263-2009 http://www.atmos-chem-phys-discuss.net/9/5263/2009/ http://www.atmos-chem-phys-discuss.net/9/5263/2009/acpd-9-5263-2009.html http://www.atmos-chem-phys-discuss.net/9/5263/2009/acpd-9-5263-2009.pdf 5263 5287 2009-02-27 Effects of boundary layer particle formation on cloud droplet number and changes in cloud albedo from 1850 to 2000 J. Merikanto j.merikanto@leeds.ac.uk D. V. Spracklen K. J. Pringle K. S. Carslaw School of Earth and Environment, University of Leeds, Leeds, UK Max Planck Institute for Chemistry, Mainz, Germany We use a global aerosol microphysics model to estimate the effect of boundary layer particle formation on cloud droplet number concentration (CDNC) on global and regional scales. The calculations are carried out for years 1850 and 2000 using historical emissions inventories for primary particles and aerosol precursor gases. 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