We vary the refractive index of black carbon from 1.75-0.44ito 1.95-0.79i in a 9member, 2015-2019 CanAM5.1-PAMensemble.• Global-mean AAOD increases 42%, similar to impact of updating aerosol emissions and 1/6 of AAOD difference between MISR and POLDER-GRASP.• BC ERFari increases 47%, comparable to the uncertainty in recent literature assessments.
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Digby et al. (2024) studied this question.
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