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Southwestern U.S. Biomass Burning Smoke Hygroscopicity: The Role of Plant Phenology, Chemical Composition, and Combustion Properties

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1029/2017JD028162· OSTI ID:1524398
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4];  [4];  [4];  [4];  [4]
  1. New Mexico Inst. of Mining and Technology, Socorro, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. New Mexico Inst. of Mining and Technology, Socorro, NM (United States)
  3. Colorado State Univ., Fort Collins, CO (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Biomass burning emissions have substantially increased with continued warming and drying in the southwestern U.S., impacting air quality and atmospheric processes. To better quantify impacts of biomass burning aerosols, an extensive laboratory study of fresh smoke emissions was conducted at Los Alamos National Laboratory. Laboratory burn experiments with selected native and invasive southwestern U.S. fuels were used to elucidate the role of fuel type, chemical composition, and ignition method on the hygroscopicity of smoke. Here we focus on a custom controlled relative humidity (RH) nephelometry system using the direct measurement of aerosol light scattering with two nephelometers—one at dry conditions and one at a controlled high RH (RH ~ 85%). Aerosol hygroscopicity was highly variable with the enhancement in light scattering coefficient in the range of 1.02 < f(RH = 85%) < 2.1 and corresponding to the kappa parameter (κneph) ranging from ~0 to 0.18. Hygroscopicity is determined primarily by the fuel's inorganic ion content. For example, invasive halophytes with high inorganic salt content exhibit much greater water uptake than native coniferous species with low inorganic content. Combustion temperature and phase, flaming or smoldering, play a secondary role in the water uptake of smoke. High–temperature ignition methods create flaming conditions that enhance hygroscopicity while lower–temperature smoldering conditions diminish hygroscopicity. Our results construct an empirical relation between κneph and the inorganic content of the fuel and smoke to predict water uptake.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1524398
Report Number(s):
LA-UR--18-20787
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 10 Vol. 123; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Progress and Challenges in Quantifying Wildfire Smoke Emissions, Their Properties, Transport, and Atmospheric Impacts journal December 2019
Optical Properties of Laboratory and Ambient Biomass Burning Aerosols: Elucidating Black, Brown, and Organic Carbon Components and Mixing Regimes journal May 2019
Mie Scattering Captures Observed Optical Properties of Ambient Biomass Burning Plumes Assuming Uniform Black, Brown, and Organic Carbon Mixtures journal November 2019

Figures / Tables (14)


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