Technical Comments

Comment on "Radiative Absorption Enhancements Due to the Mixing State of Atmospheric Black Carbon"

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Science  25 Jan 2013:
Vol. 339, Issue 6118, pp. 393
DOI: 10.1126/science.1229920

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Cappa et al. (Reports, 31 August 2012, p. 1078) suggest that black carbon (BC) in a mixture absorbs only ~6% more sunlight than when volatile chemicals are evaporated from the mixture, and state that "many climate models may overestimate warming by BC." However, the authors misinterpret at least some model results and omit optical focusing at high relative humidity and of involatile components. Thus, their conclusion about model error is not demonstrated.

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