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Discussion papers
https://doi.org/10.5194/acp-2019-707
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-707
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Aug 2019

Submitted as: research article | 15 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Biomass-burning derived particles from a wide variety of fuels: Part 1: Properties of primary particles

Crystal D. McClure1, Christopher Y. Lim2,a, David H. Hagan2, Jesse H. Kroll2, and Christopher D. Cappa1,3 Crystal D. McClure et al.
  • 1Department of Civil and Environmental Engineering, University of California, Davis, CA 95616
  • 2Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
  • 3Atmospheric Sciences Graduate Group, University of California, Davis, CA, USA 95616
  • anow at: Department of Chemistry, University of Toronto, Ontario, Canada

Abstract. Relationships between various optical, physical, and chemical properties of biomass combustion derived particles are characterized for particles produced from a wide range of fuels and burn conditions. The modified combustion efficiency (MCE), commonly used to parameterize biomass particle emissions and properties, is shown to generally have weak predictive capabilities, especially for more efficient combustion conditions. There is, however, a strong relationship between many intensive optical properties (e.g. single scatter albedo, Ångstrom absorption exponent, mass absorption efficiency) and the organic aerosol-to-black carbon ([OA] / [BC]) mass ratio over a wider range than previously considered (0.3 to 105). The properties of brown carbon (BrC, i.e. light absorbing organic carbon) also vary with [OA] / [BC]. The contribution of coating-induced enhancements (i.e. lensing effects) to absorption by black carbon are shown to be negligible for all conditions. The BC-OA mixing state varies strongly with [OA] / [BC]; the fraction of OA that is internally mixed with BC decreases with [OA] / [BC] while the relative amount of OA coated on BC increases. In contrast, there is little relationship between many OA bulk chemical properties and [OA] / [BC], with the O : C and H : C atomic ratios and the relative abundance of a key marker ion (m/z = 60, linked to levoglucosan) all showing no dependence on [OA] / [BC]. In contrast, both the organic nitrate fraction of OA and the OA volatility do depend on the [OA] / [BC]. Neither the total particle or BC-specific size distributions exhibit any clear dependence on the burn conditions or [OA] / [BC], although there is perhaps a dependence on fuel type. Overall, our results expand on existing knowledge to contribute new understanding of the properties of particles emitted from biomass combustion.

Crystal D. McClure et al.
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Measurements from the Fire Influence on Regional and Global Environments Experiment (FIREX) Fire Lab Mini Chamber Experiment C. D. Cappa, C. Y. Lim, D. H. Hagan, and J. H. Kroll https://doi.org/10.25338/B8CK5N

Crystal D. McClure et al.
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Short summary
We characterized various optical, chemical, and physical properties of particles produced from combustion of a variety of different biomass fuels, many representative of those found in the western US. We find that many properties scale with the ratio between bulk average organic aerosol and black carbon mass concentrations, although there are some properties that do not.
We characterized various optical, chemical, and physical properties of particles produced from...
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