Mass Absorption Cross-Section of Ambient Black Carbon Aerosol in Relation to Chemical Age

By A. Knox, G. Evans, J. Brook, Xiao-Yan Yao, C. Jeong, K. Godri, K. Sabaliauskas, J. Slowik. 2009

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Variation of the radiative properties during black carbon aging: theoretical and experimental intercomparison (2015, methodology): “Knox et al. (2009) found an absorption enhancement of up to 45 % due to BC coating based on measurements in downtown Toronto.”
Exploiting simultaneous observational constraints on mass and absorption to estimate the global direct radiative forcing of black carbon and brown carbon (2014, background): “We fix the constanta to be 2× 10−22 cm6 molec−2 s−1, resulting in a mean e-folding time close to 1.15 days for typical urban conditions with OH concentrations of 106 molec cm−3 and SO2 concentrations of 5× 1010 molec cm−3 (∼ 2 ppb).”
Deriving brown carbon from multiwavelength absorption measurements: method and application to AERONET and Aethalometer observations (2016, methodology): “…lognormal, with geometric median diameter (GMD) ranging from 20 to 300 nm and standard deviation (δ) ranging from 1.4 to 2.2 (Akagi et al., 2012; Schwarz et al., 2008; Lack et al., 2012; Dubovik et al., 2002; Shamjad et al., 2012; Moffet and Prather, 2009; Knox et al., 2009; Lewis et al., 2009).”