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Constraining the complex refractive indices, optical properties and size ofbrown carbon (BrC) aerosols is a vital endeavor for improving climate modelsand satellite retrieval algorithms. Smoldering wildfires are the largest sourceof primary BrC, and fuel parameters such as moisture content, source depth,geographic origin, and fuel packing density could influence the properties ofthe emitted aerosol. We measured in situ spectral (375-1047 nm) opticalproperties of BrC aerosols emitted from smoldering combustion of Boreal andIndonesian peatlands across a range of these fuel parameters. InverseLorenz-Mie algorithms used these optical measurements along with simultaneouslymeasured particle size distributions to retrieve the aerosol complex refractiveindices (m=n+i{\kappa}). Our results show that the real part n is constrainedbetween 1.5 and 1.7 with no obvious functionality in wavelength ({\lambda}),moisture content, source depth, or geographic origin. With increasing {\lambda}from 375 to 532 nm, {\kappa} decreased from 0.014 to 0.003, with correspondingincrease in single scattering albedo from 0.93 to 0.99. For {\lambda} = 532 nm,both {\kappa} and single scattering albedo showed no spectral dependency. Wediscuss differences between this study and previous work. The imaginary part{\kappa} was sensitive to changes in FPD, and we hypothesize mechanisms thatmight help explain this observation.

UV-Vis-IR Spectral Complex Refractive Indices and Optical Properties of Brown Carbon Aerosol from Biomass Burning