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Single-scattering albedo (SSA) and absorption Ångström\udexponent (AAE) are two critical parameters in determining the impact of\udabsorbing aerosol on the Earth's radiative balance. Aerosol emitted by\udbiomass burning represent a significant fraction of absorbing aerosol\udglobally, but it remains difficult to accurately predict SSA and AAE for\udbiomass burning aerosol. Black carbon (BC), brown carbon (BrC), and\udnon-absorbing coatings all make substantial contributions to the absorption\udcoefficient of biomass burning aerosol. SSA and AAE cannot be directly\udpredicted based on fuel type because they depend strongly on burn\udconditions. It has been suggested that SSA can be effectively parameterized\udvia the modified combustion efficiency (MCE) of a biomass burning event and\udthat this would be useful because emission factors for CO and CO2, from\udwhich MCE can be calculated, are available for a large number of fuels. Here\udwe demonstrate, with data from the FLAME-4 experiment, that for a wide\udvariety of globally relevant biomass fuels, over a range of combustion\udconditions, parameterizations of SSA and AAE based on the elemental carbon\ud(EC) to organic carbon (OC) mass ratio are quantitatively superior to\udparameterizations based on MCE. We show that the EC ∕ OC ratio and the ratio\udof EC ∕ (EC + OC) both have significantly better correlations with SSA than\udMCE. Furthermore, the relationship of EC ∕ (EC + OC) with SSA is linear.\udThese improved parameterizations are significant because, similar to MCE,\udemission factors for EC (or black carbon) and OC are available for a wide\udrange of biomass fuels. Fitting SSA with MCE yields correlation coefficients\ud(Pearson's r) of  ∼  0.65 at the visible wavelengths of 405,\ud532, and 660 nm while fitting SSA with EC / OC or EC / (EC + OC) yields a\udPearson's r of 0.94–0.97 at these same wavelengths. The strong correlation\udcoefficient at 405 nm (r =  0.97) suggests that parameterizations based on\udEC / OC or EC / (EC + OC) have good predictive capabilities even for fuels in\udwhich brown carbon absorption is significant. Notably, these\udparameterizations are effective for emissions from Indonesian peat, which\udhave very little black carbon but significant brown carbon (SSA  =  0.990 ± 0.001 at 532 and 660 nm, SSA  =  0.937 ± 0.011 at 405 nm).\udFinally, we demonstrate that our parameterization based on EC / (EC + OC)\udaccurately predicts SSA during the first few hours of plume aging with data\udfrom Yokelson et al. (2009) gathered during a biomass burning event in the\udYucatán Peninsula of Mexico

Parameterization of single-scattering albedo (SSA) and absorption Ångström exponent (AAE) with EC / OC for aerosol emissions from biomass burning