DOI: 10.1002/2014JD022350
论文题名: Black carbon and other light-absorbing particles in snow of central North America
作者: Doherty S.J. ; Dang C. ; Hegg D.A. ; Zhang R. ; Warren S.G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12807
结束页码: 12831
语种: 英语
英文关键词: black carbon
; Great Plains
; light-absorbing particles
; snow
Scopus关键词: black carbon
; concentration (composition)
; latitudinal gradient
; light effect
; particulate matter
; snow
; vertical profile
; Canada
; North America
英文摘要: Vertical profiles of light-absorbing particles in seasonal snow were sampled from 67 North American sites. Over 500 snow samples and 55 soil samples from these sites were optically analyzed for spectrally resolved visible light absorption. The optical measurements were used to estimate black carbon (BC) mixing ratios in snow (CBCest), contributions to absorption by BC and non-BC particles, and the absorption Ångström exponent of particles in snow and local soil. Sites in Canada tended to have the lowest BC mixing ratios (typically ~5-35 ng g-1), with somewhat higher CBCest in the Pacific Northwest (typically ~5-40 ng g-1) and Intramountain Northwest (typically 10-50 ng g-1). The Northern U.S. Plains sites were the dirtiest, with CBCest typically ~15-70 ng g-1 and multiple sample layers with >100 ng g-1 BC in snow. Snow water samples were also chemically analyzed for standard anions, selected carbohydrates, and various elements. The chemical and optical data were input to a Positive Matrix Factorization analysis of the sources of particulate light absorption. These were soil, biomass/biofuel burning, and fossil fuel pollution. Comparable analyses have been conducted for the Arctic and North China, providing a broad, internally consistent data set. As in North China, soil is a significant contributor to snow particulate light absorption in the Great Plains. We also examine the concentrations and sources of snow particulate light absorption across a latitudinal transect from the northern U.S. Great Plains to Arctic Canada by combining the current data with our earlier Arctic survey. ©2014. American Geophysical Union. All Rights Reserved. 资助项目: NA10OAR4320148
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63021
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: Joint Institute for the Study of Atmosphere and Ocean, Seattle, WA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China
Recommended Citation:
Doherty S.J.,Dang C.,Hegg D.A.,et al. Black carbon and other light-absorbing particles in snow of central North America[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)