气候变化领域集成服务门户(CCPortal): Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume

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DOI	10.1029/2020JD032399
	Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume
	Lee J.E.; Dubey M.K.; Aiken A.C.; Chylek P.; Carrico C.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	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. ©2020 The Authors.
英文关键词	absorption enhancement; aerosols; black carbon; brown carbon; chemistry; wildfire
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185873
作者单位	Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Civil and Environmental Engineering, New Mexico Institute of Mining and Technology, Socorro, NM, United States
推荐引用方式 GB/T 7714	Lee J.E.,Dubey M.K.,Aiken A.C.,et al. Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume[J],2020,125(15).
APA	Lee J.E.,Dubey M.K.,Aiken A.C.,Chylek P.,&Carrico C.M..(2020).Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Lee J.E.,et al."Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume".Journal of Geophysical Research: Atmospheres 125.15(2020).