1Max Planck Institute for Meteorology, Hamburg, Germany
2International Max Planck Research School on Earth System Modelling, Hamburg, Germany
3Department of Physics, University of Oxford, UK
4Institute for Meteorology, University of Leipzig, Leipzig, Germany
*now at: ARC Centre of Excellence for Climate System Science, Monash University, School of Mathematical Sciences,Clayton, VIC 3800, Australia
Abstract. An error in the calculation of the emitted number of primary sulfate particles for a given mass of emitted elementary sulfur has recently been identified in HAM, i.e. the aerosol module utilised in the ECHAM-HAM aerosol climate model. Correcting for this error substantially alters the estimates of top-of-atmosphere radiative forcing due to aerosol indirect effects from global shipping emissions (year 2000) as presented in Peters et al. (2012). Here, we shortly present these new results.