DOI: 10.1029/2017JD028162
Scopus记录号: 2-s2.0-85047629380
论文题名: Southwestern U.S. Biomass Burning Smoke Hygroscopicity: The Role of Plant Phenology, Chemical Composition, and Combustion Properties
作者: Gomez S.L. ; Carrico C.M. ; Allen C. ; Lam J. ; Dabli S. ; Sullivan A.P. ; Aiken A.C. ; Rahn T. ; Romonosky D. ; Chylek P. ; Sevanto S. ; Dubey M.K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 10 起始页码: 5416
结束页码: 5432
语种: 英语
英文关键词: biomass burning
; ecotech nephelometer
; hygroscopicity
; kappa nephelometer
; southwestern U.S
; wildland fires
英文摘要: 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113867
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, New Mexico Institute of Mining and Technology, Socorro, NM, United States; Los Alamos National Laboratory, Earth and Environmental Science, Los Alamos, NM, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Gomez S.L.,Carrico C.M.,Allen C.,et al. Southwestern U.S. Biomass Burning Smoke Hygroscopicity: The Role of Plant Phenology, Chemical Composition, and Combustion Properties[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(10)