Optical Properties of Laboratory & Ambient Biomass Burning Aerosols: Elucidating Black, Brown, & Organic Carbon Components & Mixing Regimes
Abstract
Abstract Biomass burning (BB) is an important global source of aerosol and trace gases that degrade air quality, decrease visibility, and impact climate and human health. Refractory black carbon (rBC), brown carbon (BrC), and organic aerosol are major components of BB emissions. BB aerosol composition is highly variable at the source and depends on fuel composition and combustion phase. Atmospheric aging alters fresh BB aerosol through processes that are complex and dynamic. To better understand the variability in optical properties, we report fresh aerosol laboratory measurements from burning southwestern U.S. fuels and compare them to aged ambient BB aerosol from wildfires over a range of atmospheric time scales. Our BB aerosol analysis uses the relationship between the absorption Ångström exponent and single‐scattering albedo (SSA) to identify rBC, BrC, and organic aerosol‐dominated regimes that are defined using Mie theory. This model framework is used to interpret the large variability in optical properties measured in laboratory burns. In contrast, we find the observed absorption Ångström exponent‐SSA relationship for ambient BB aerosol to be less variable and more clustered together with increased atmospheric aging. This transition from fresh to aged behavior is attributed to the homogenization of the BB aerosol from mixing andmore »
- Authors:
-
[1];
[1];
[1];
[1]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Inst. of Mining and Technology, Socorro, NM (United States)
- New Mexico Inst. of Mining and Technology, Socorro, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1508557
- Alternate Identifier(s):
- OSTI ID: 1511059
- Report Number(s):
- LA-UR-18-30035
Journal ID: ISSN 2169-897X
- Grant/Contract Number:
- 89233218CNA000001; DE‐AC52‐06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 9; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; 54 ENVIRONMENTAL SCIENCES; Earth Sciences
Citation Formats
Romonosky, Dian E., Gomez, Samantha L., Lam, Jared Tate, Carrico, Christian M., Aiken, Allison C., Chylek, Petr, and Dubey, Manvendra Krishna. Optical Properties of Laboratory & Ambient Biomass Burning Aerosols: Elucidating Black, Brown, & Organic Carbon Components & Mixing Regimes. United States: N. p., 2019.
Web. doi:10.1029/2018JD029892.
Romonosky, Dian E., Gomez, Samantha L., Lam, Jared Tate, Carrico, Christian M., Aiken, Allison C., Chylek, Petr, & Dubey, Manvendra Krishna. Optical Properties of Laboratory & Ambient Biomass Burning Aerosols: Elucidating Black, Brown, & Organic Carbon Components & Mixing Regimes. United States. https://doi.org/10.1029/2018JD029892
Romonosky, Dian E., Gomez, Samantha L., Lam, Jared Tate, Carrico, Christian M., Aiken, Allison C., Chylek, Petr, and Dubey, Manvendra Krishna. Tue .
"Optical Properties of Laboratory & Ambient Biomass Burning Aerosols: Elucidating Black, Brown, & Organic Carbon Components & Mixing Regimes". United States. https://doi.org/10.1029/2018JD029892. https://www.osti.gov/servlets/purl/1508557.
@article{osti_1508557,
title = {Optical Properties of Laboratory & Ambient Biomass Burning Aerosols: Elucidating Black, Brown, & Organic Carbon Components & Mixing Regimes},
author = {Romonosky, Dian E. and Gomez, Samantha L. and Lam, Jared Tate and Carrico, Christian M. and Aiken, Allison C. and Chylek, Petr and Dubey, Manvendra Krishna},
abstractNote = {Abstract Biomass burning (BB) is an important global source of aerosol and trace gases that degrade air quality, decrease visibility, and impact climate and human health. Refractory black carbon (rBC), brown carbon (BrC), and organic aerosol are major components of BB emissions. BB aerosol composition is highly variable at the source and depends on fuel composition and combustion phase. Atmospheric aging alters fresh BB aerosol through processes that are complex and dynamic. To better understand the variability in optical properties, we report fresh aerosol laboratory measurements from burning southwestern U.S. fuels and compare them to aged ambient BB aerosol from wildfires over a range of atmospheric time scales. Our BB aerosol analysis uses the relationship between the absorption Ångström exponent and single‐scattering albedo (SSA) to identify rBC, BrC, and organic aerosol‐dominated regimes that are defined using Mie theory. This model framework is used to interpret the large variability in optical properties measured in laboratory burns. In contrast, we find the observed absorption Ångström exponent‐SSA relationship for ambient BB aerosol to be less variable and more clustered together with increased atmospheric aging. This transition from fresh to aged behavior is attributed to the homogenization of the BB aerosol from mixing and aging over several hours. Finally, BB aerosol in ambient fire plumes that have aged for several hours exhibits larger SSAs than laboratory flaming burns. We conclude that BrC/OC mixtures play a larger role than rBC in the positive climate forcing of BB aerosol than what would be projected from laboratory results.},
doi = {10.1029/2018JD029892},
journal = {Journal of Geophysical Research: Atmospheres},
number = 9,
volume = 124,
place = {United States},
year = {Tue Apr 16 00:00:00 EDT 2019},
month = {Tue Apr 16 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)
journal, January 2018
- Brown, Hunter; Liu, Xiaohong; Feng, Yan
- Atmospheric Chemistry and Physics, Vol. 18, Issue 24