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Emission factors for open and domestic biomass burning for use in atmospheric models

by S. K. Akagi, R. J. Yokelson, C. Wiedinmyer, M. J. Alvarado, J. S. Reid, T. Karl, J. D. Crounse, P. O. Wennberg
Atmospheric Chemistry and Physics ()
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Abstract

Biomass burning (BB) is the second largest source of trace gases and the largest source of primary fine carbona-ceous particles in the global troposphere. Many recent BB studies have provided new emission factor (EF) measure-ments. This is especially true for non-methane organic com-pounds (NMOC), which influence secondary organic aerosol (SOA) and ozone formation. New EF should improve re-gional to global BB emissions estimates and therefore, the input for atmospheric models. In this work we present an up-to-date, comprehensive tabulation of EF for known pyro-genic species based on measurements made in smoke that has cooled to ambient temperature, but not yet undergone signif-icant photochemical processing. All EFs are converted to one standard form (g compound emitted per kg dry biomass burned) using the carbon mass balance method and they are categorized into 14 fuel or vegetation types. Biomass burn-ing terminology is defined to promote consistency. We com-pile a large number of measurements of biomass consump-tion per unit area for important fire types and summarize several recent estimates of global biomass consumption by the major types of biomass burning. Post emission pro-cesses are discussed to provide a context for the emission factor concept within overall atmospheric chemistry and also highlight the potential for rapid changes relative to the scale of some models or remote sensing products. Recent work Correspondence to: R. J. Yokelson (bob.yokelson@umontana.edu) shows that individual biomass fires emit significantly more gas-phase NMOC than previously thought and that including additional NMOC can improve photochemical model perfor-mance. A detailed global estimate suggests that BB emits at least 400 Tg yr −1 of gas-phase NMOC, which is almost 3 times larger than most previous estimates. Selected recent re-sults (e.g. measurements of HONO and the BB tracers HCN and CH 3 CN) are highlighted and key areas requiring future research are briefly discussed.

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