Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume
Abstract
Wildfires emit mixtures of light-absorbing aerosols (including black and brown carbon, BC and BrC, respectively) and more purely scattering organic aerosol (OA). BC, BrC, and OA interactions are complex and dynamic and evolve with aging in the atmosphere resulting in large uncertainties in their radiative forcing. We report microphysical, optical, and chemical measurements of multiple plumes from the Woodbury Fire (AZ, USA) observed at Los Alamos, NM, after 11–18 hr of atmospheric transit. This includes periods where the plumes exhibited little entrainment as well as periods that had become more dilute after mixing with background aerosol. Aerosol mass absorption cross sections (MAC) were enhanced by a factor of 1.5–2.2 greater than bare BC at 870 nm, suggesting lensing by nonabsorbing coatings following a core-shell morphology. Larger MAC enhancement factors of 1.9–5.1 at 450 nm are greater than core-shell morphology can explain and are attributed to BrC. MAC of OA (MACOrg) at 450 nm was largest in intact portions of the plumes (peak value bounded between 0.6 and 0.9 m2/g [Org]) and decreased with plume dilution. We report a strong correlation between MACOrg(450 nm) with the fC2H4O2 (a tracer for levoglucosan-like species) of coatings and of bulk OA indicating that BrC in the Woodbury Fire was coemittedmore »
- Authors:
-
[1];
[1];
[1];
[1];
[2]
- Earth and Environmental SciencesLos Alamos National Laboratory Los Alamos NM USA
- Department of Civil and Environmental EngineeringNew Mexico Institute of Mining and Technology Socorro NM USA
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
- OSTI Identifier:
- 1646935
- Alternate Identifier(s):
- OSTI ID: 1646937; OSTI ID: 1726186
- Report Number(s):
- LA-UR-20-20021
Journal ID: ISSN 2169-897X; e2020JD032399
- Grant/Contract Number:
- F26500; 89233218CNA000001; 1832813; 20200035DR
- Resource Type:
- Published Article
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Name: Journal of Geophysical Research: Atmospheres Journal Volume: 125 Journal Issue: 15; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Wildfire; aerosols; brown carbon; black carbon; absorption enhancement; chemistry
Citation Formats
Lee, James E., Dubey, Manvendra K., Aiken, Allison C., Chylek, Petr, and Carrico, Christian M. Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume. United States: N. p., 2020.
Web. doi:10.1029/2020JD032399.
Lee, James E., Dubey, Manvendra K., Aiken, Allison C., Chylek, Petr, & Carrico, Christian M. Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume. United States. https://doi.org/10.1029/2020JD032399
Lee, James E., Dubey, Manvendra K., Aiken, Allison C., Chylek, Petr, and Carrico, Christian M. Mon .
"Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume". United States. https://doi.org/10.1029/2020JD032399.
@article{osti_1646935,
title = {Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume},
author = {Lee, James E. and Dubey, Manvendra K. and Aiken, Allison C. and Chylek, Petr and Carrico, Christian M.},
abstractNote = {Wildfires emit mixtures of light-absorbing aerosols (including black and brown carbon, BC and BrC, respectively) and more purely scattering organic aerosol (OA). BC, BrC, and OA interactions are complex and dynamic and evolve with aging in the atmosphere resulting in large uncertainties in their radiative forcing. We report microphysical, optical, and chemical measurements of multiple plumes from the Woodbury Fire (AZ, USA) observed at Los Alamos, NM, after 11–18 hr of atmospheric transit. This includes periods where the plumes exhibited little entrainment as well as periods that had become more dilute after mixing with background aerosol. Aerosol mass absorption cross sections (MAC) were enhanced by a factor of 1.5–2.2 greater than bare BC at 870 nm, suggesting lensing by nonabsorbing coatings following a core-shell morphology. Larger MAC enhancement factors of 1.9–5.1 at 450 nm are greater than core-shell morphology can explain and are attributed to BrC. MAC of OA (MACOrg) at 450 nm was largest in intact portions of the plumes (peak value bounded between 0.6 and 0.9 m2/g [Org]) and decreased with plume dilution. We report a strong correlation between MACOrg(450 nm) with the fC2H4O2 (a tracer for levoglucosan-like species) of coatings and of bulk OA indicating that BrC in the Woodbury Fire was coemitted with levoglucosan, a primary aerosol. fC2H4O2 and MACOrg(450 nm) are shown to vary between the edge and the core of plumes, demonstrating enhanced oxidation of OA and BrC bleaching near plume edges. Our process-level finding can inform parameterizations of mixed BC, BrC, and OA properties for wildfire plumes in climate models.},
doi = {10.1029/2020JD032399},
journal = {Journal of Geophysical Research: Atmospheres},
number = 15,
volume = 125,
place = {United States},
year = {Mon Aug 10 00:00:00 EDT 2020},
month = {Mon Aug 10 00:00:00 EDT 2020}
}
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journal, November 1987
- Boggs, Paul T.; Byrd, Richard H.; Schnabel, Robert B.
- SIAM Journal on Scientific and Statistical Computing, Vol. 8, Issue 6
Simultaneous aerosol mass spectrometry and chemical ionisation mass spectrometry measurements during a biomass burning event in the UK: insights into nitrate chemistry
journal, January 2018
- Reyes-Villegas, Ernesto; Priestley, Michael; Ting, Yu-Chieh
- Atmospheric Chemistry and Physics, Vol. 18, Issue 6
Aerosol single scattering albedo dependence on biomass combustion efficiency: Laboratory and field studies: SINGLE SCATTERING ALBEDO OF BB AEROSOL
journal, January 2014
- Liu, Shang; Aiken, Allison C.; Arata, Caleb
- Geophysical Research Letters, Vol. 41, Issue 2
Chemical, physical, and optical evolution of biomass burning aerosols: a case study
journal, January 2011
- Adler, G.; Flores, J. M.; Abo Riziq, A.
- Atmospheric Chemistry and Physics, Vol. 11, Issue 4
Effects of aging on organic aerosol from open biomass burning smoke in aircraft and laboratory studies
journal, January 2011
- Cubison, M. J.; Ortega, A. M.; Hayes, P. L.
- Atmospheric Chemistry and Physics, Vol. 11, Issue 23
Evolution of brown carbon in wildfire plumes
journal, June 2015
- Forrister, Haviland; Liu, Jiumeng; Scheuer, Eric
- Geophysical Research Letters, Vol. 42, Issue 11
Investigations of SP-AMS Carbon Ion Distributions as a Function of Refractory Black Carbon Particle Type
journal, April 2015
- Onasch, Timothy B.; Fortner, Edward C.; Trimborn, Achim M.
- Aerosol Science and Technology, Vol. 49, Issue 6