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Black carbon (BC) in snow lowers its albedo, increasing the absorption ofsunlight, leading to positive radiative forcing, climate warming and earliersnowmelt. A series of recent studies have used prescribed-aerosoldeposition flux fields in climate model runs to assess the forcing by blackcarbon in snow. In these studies, the prescribed mass deposition flux of BCto surface snow is decoupled from the mass deposition flux of snow water tothe surface. Here we compare prognostic- and prescribed-aerosol runs and usea series of offline calculations to show that the prescribed-aerosol approach results, onaverage, in a factor of about 1.5–2.5 high bias in annual-mean surface snowBC mixing ratios in three key regions for snow albedo forcing by BC:Greenland, Eurasia and North America. These biases will propagate directlyto positive biases in snow and surface albedo reduction by BC. The bias isshown be due to coupling snowfall that varies on meteorological timescales(daily or shorter) with prescribed BC mass deposition fluxes that are moretemporally and spatially smooth. The result is physically non-realisticmixing ratios of BC in surface snow. We suggest that an alternative approachwould be to prescribe BC mass mixing ratios in snowfall, rather than BC massfluxes, and we show that this produces more physically realistic BC mixingratios in snowfall and in the surface snow layer

Biases in modeled surface snow BC mixing ratios in prescribed-aerosol climate model runs