DOI: 10.1002/2015JD024389
论文题名: Rapidly evolving ultrafine and fine mode biomass smoke physical properties: Comparing laboratory and field results
作者: Carrico C.M. ; Prenni A.J. ; Kreidenweis S.M. ; Levin E.J.T. ; Mccluskey C.S. ; Demott P.J. ; Mcmeeking G.R. ; Nakao S. ; Stockwell C. ; Yokelson R.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
语种: 英语
英文关键词: Biomass smoke
; Carbonaceous aerosols
; Flaming
; PM2.5
; Smoldering
; Ultrafine particles
英文摘要: Combining field and laboratory results, we present biomass smoke physical properties. We report sub-0.56μm diameter (Dp) particle sizing (fast mobility particle sizer, FMPS) plus light absorption and scattering at 870nm (photoacoustic extinctiometer). For Dp<200nm, the FMPS characterized sizing within ±20% compared to standards. As compared to the traditional scanning mobility particle sizer, the FMPS responded most accurately to single-mode polydispersions with mean Dp<200nm, which characterized the smoke sampled here. Smoke was measured from laboratory fresh emissions (seconds to hours old), the High Park Fire (hours to<1day), and from regional biomass burning (several days). During a High Park Fire episode, light extinction rapidly reached a maximum of σep=569±21Mm-1 (10min) with aerosol single scattering albedo peaking at ω=0.955±0.004. Concurrently, number concentration and size peaked with maximum Dp=126nm and a unimodal distribution with σg=1.5. Long-range transported smoke was substantially diluted (Ntot factor of 7 lower) and shifted larger (maximum Dp=143) and wider (σg=2.2). We compared ambient data to laboratory burns with representative western U.S. forest fuels (coniferous species Ponderosa pine and Alaska black spruce). Smoldering pine produced an aerosol dominated by larger, more strongly light scattering particles (Dp>100nm), while flaming combustion produced very high number concentrations of smaller (Dp~50nm) absorbing particles. Due to smoldering and particle growth processes, Dp approached 100nm within 3h after emission. Increased particle cross-sectional area and Mie scattering efficiency shifted the relative importance of light absorption (flaming maximum) and light scattering (smoldering maximum), increasing ω over time. Measurements showed a consistent picture of smoke properties from emission to aging. © 2016. 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/62959
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: New Mexico Institute of Mining and Technology Socorro, New Mexico USA; U.S. National Park Service Lakewood, Colorado USA; Colorado State University Fort Collins, Colorado USA; Droplet Measurement Technologies, Inc. Boulder, Colorado USA; Now at Handix Scientific Boulder, Colorado USA; Clarkson University Potsdam, New York USA; Department of Chemistry University of Montana Missoula, Montana USA
Recommended Citation:
Carrico C.M.,Prenni A.J.,Kreidenweis S.M.,et al. Rapidly evolving ultrafine and fine mode biomass smoke physical properties: Comparing laboratory and field results[J]. Journal of Geophysical Research: Atmospheres,2016-01-01