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DOI	10.5194/acp-20-13319-2020
	Rapid evolution of aerosol particles and their optical properties downwind of wildfires in the western US
	Kleinman L.I.; Sedlacek A.J.; III; Adachi K.; Buseck P.R.; Collier S.; Dubey M.K.; Hodshire A.L.; Lewis E.; Onasch T.B.; Pierce J.R.; Shilling J.; Springston S.R.; Wang J.; Zhang Q.; Zhou S.; Yokelson R.J.
发表日期	2020
ISSN	1680-7316
起始页码	13319
结束页码	13341
卷号	20 期号:21
英文摘要	During the first phase of the Biomass Burn Operational Project (BBOP) field campaign, conducted in the Pacific Northwest, the DOE G-1 aircraft was used to follow the time evolution of wildfire smoke from near the point of emission to locations 2-3.5 h downwind. In nine flights we made repeated transects of wildfire plumes at varying downwind distances and could thereby follow the plume's time evolution. On average there was little change in dilution-normalized aerosol mass concentration as a function of downwind distance. This consistency hides a dynamic system in which primary aerosol particles are evaporating and secondary ones condensing. Organic aerosol is oxidized as a result. On all transects more than 90 % of aerosol is organic. In freshly emitted smoke aerosol, NH+4 is approximately equivalent to NO3. After 2 h of daytime aging, NH+4 increased and is approximately equivalent to the sum of Cl, SO24, and NO3. Particle size increased with downwind distance, causing particles to be more efficient scatters. Averaged over nine flights, mass scattering efficiency (MSE) increased in ∼ 2 h by 56 % and doubled in one flight. Mechanisms for redistributing mass from small to large particles are discussed. Coagulation is effective at moving aerosol from the Aitken to accumulation modes but yields only a minor increase in MSE. As absorption remained nearly constant with age, the time evolution of single scatter albedo was controlled by age-dependent scattering. Near-fire aerosol had a single scatter albedo (SSA) of 0.8-0.9. After 1 to 2 h of aging SSAs were typically 0.9 and greater. Assuming global-average surface and atmospheric conditions, the observed age dependence in SSA would change the direct radiative effect of a wildfire plume from near zero near the fire to a cooling effect downwind. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; albedo; coagulation; concentration (composition); optical property; particle size; wildfire; Pacific Northwest; United States
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247390
作者单位	Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, United States; Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute, Tsukuba, Japan; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Department of Environmental Toxicology, University of California, Davis, CA, United States; Earth Systems Observations, Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Aerodyne Research Inc., Billerica, MA, United States; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, United States; California Air Resources Board, Sacramento, CA, United States; Center for Aerosol Science and Engineering, Washington University, St. Louis, MO, United St...
推荐引用方式 GB/T 7714	Kleinman L.I.,Sedlacek A.J.,III,et al. Rapid evolution of aerosol particles and their optical properties downwind of wildfires in the western US[J],2020,20(21).
APA	Kleinman L.I..,Sedlacek A.J..,III.,Adachi K..,Buseck P.R..,...&Yokelson R.J..(2020).Rapid evolution of aerosol particles and their optical properties downwind of wildfires in the western US.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21).
MLA	Kleinman L.I.,et al."Rapid evolution of aerosol particles and their optical properties downwind of wildfires in the western US".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020).