Mie Scattering Captures Observed Optical Properties of Ambient Biomass Burning Plumes Assuming Uniform Black, Brown, and Organic Carbon Mixtures

Chylek, Petr; Lee, James Edward; Romonosky, Dian E.; Gallo, Francesca; Lou, Sijia; Shrivastava, Manish; Carrico, Christian M.; Aiken, Allison C.; Dubey, Manvendra K.

doi:10.1029/2019JD031224

Title: Mie Scattering Captures Observed Optical Properties of Ambient Biomass Burning Plumes Assuming Uniform Black, Brown, and Organic Carbon Mixtures

Journal Article · 13 September 2019 · Journal of Geophysical Research: Atmospheres

DOI: https://doi.org/10.1029/2019JD031224 · OSTI ID:1608787

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); State Univ. of New York at Geneseo, Geneseo, NY (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Inst. of Mining and Technology, Socorro, NM (United States). Dept. of Civil and Environmental Engineering

We use a simple model of a spherical biomass burning aerosol particle containing an internal mixture of black carbon (BC) and organic carbon (OC) with an effective refractive index calculated as a volume fraction weighted mean of refractive indices. Brown carbon (BrC) is considered to be an OC with an imaginary part of refractive index at the blue end of the solar spectrum higher (in absolute value) than at the red end. Mie scattering formalism is employed to calculate Absorption Ångström Exponent (AAE) as a function of single scattering albedo (SSA) for a set of BC refractive indices, BC volume fraction, and a set of effective refractive indices of BC and BrC mixture. Ambient plumes are characterized by their mean SSA at 405 nm wavelength and two–wavelength (405 nm and 781 nm) AAE values. Comparing observed and model calculated AAE and SSA values identifies the BC refractive index and its volume fraction, and an effective refractive index of the BC and BrC mixture. From these values the imaginary part of BrC refractive index is calculated. For observed southwestern ambient fires the imaginary part of BrC refractive index ≤0.016. In contrast, fires in the Amazon and from Africa are dominated by BC. Here, we also use the Mie scattering model to establish the upper limit on AAE of BC (AAE≤1.4), and the upper limit of the BC and OC mixture (AAE≤1.7). Any AAE(405/781)>1.7 requires the presence of BrC. We derive several relationships between AAE, SSA, BC fractions, and imaginary part of BrC refractive index of ambient fires.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830; 89233218CNA000001

OSTI ID:: 1608787

Alternate ID(s):: OSTI ID: 1571601

Report Number(s):: PNNL-SA-149233; LA-UR-19-25547

Journal Information:: Journal of Geophysical Research: Atmospheres, Vol. 124, Issue 21; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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54 ENVIRONMENTAL SCIENCES
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Title: Mie Scattering Captures Observed Optical Properties of Ambient Biomass Burning Plumes Assuming Uniform Black, Brown, and Organic Carbon Mixtures

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