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Traditional gas and particle phase chemical markers used to identify thepresence of biomass burning (BB) emissions were measured for a large forestfire near Boulder, Colorado. Correlation of the organic matter massspectroscopic m/z 60 with measured particle light absorption properties foundno link at 532 nm, and a strong correlation at 404 nm. Non-black carbonabsorption at 404 nm was well correlated to the ratio of the mass fractionsof particulate organic matter (POM) that was m/z 60 (f60) to m/z 44(f44). The f60 to f44 ratio did not fully explain thevariability in non-BC absorption, due to contributions of brown carbon (BrC)absorption and absorption due to internal mixing of POM with black carbon(BC). The absorption Ångstrom exponent (ÅAbs) showed a good correlationto f60/f44; however the best correlation resulted from the massabsorption efficiency (MAE) of BrC at 404 nm (MAEPOM-404 nm) andf60/f44. This result indicates that the absorption of POM at lowvisible and UV wavelengths is linked to emissions of organic matter thatcontribute to the m/z 60 mass fragment, although they do not contribute to 532 nmabsorption. m/z 60 is often attributed to levoglucosan and related compounds.The linear relationship between MAEPOM-404 nm and f60/f44suggests that the strength of BrC absorption for this fire can be predictedby emissions of f60-related organic matter

Brown carbon absorption linked to organic mass tracers in biomass burning particles