DOI: 10.1002/2015GB005247
Scopus记录号: 2-s2.0-84955172156
论文题名: Black carbon aerosol dynamics and isotopic composition in Alaska linked with boreal fire emissions and depth of burn in organic soils
作者: Mouteva G ; O ; , Czimczik C ; I ; , Fahrni S ; M ; , Wiggins E ; B ; , Rogers B ; M ; , Veraverbeke S ; , Xu X ; , Santos G ; M ; , Henderson J ; , Miller C ; E ; , Randerson J ; T
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 11 起始页码: 1977
结束页码: 2000
语种: 英语
英文关键词: biomass burning
; boreal forest ecosystems
; burn severity
; climate-carbon feedback
; elemental analysis
; fuel consumption
Scopus关键词: aerosol
; atmospheric transport
; biomass burning
; black carbon
; boreal forest
; carbon dioxide
; carbon isotope
; depth determination
; emission inventory
; feedback mechanism
; fossil fuel
; fuel consumption
; isotopic composition
; nitrogen
; organic carbon
; organic soil
; particle size
; satellite data
; soil horizon
; spatiotemporal analysis
; stable isotope
; Alaska
; Arctic
; United States
英文摘要: Black carbon (BC) aerosol emitted by boreal fires has the potential to accelerate losses of snow and ice in many areas of the Arctic, yet the importance of this source relative to fossil fuel BC emissions from lower latitudes remains uncertain. Here we present measurements of the isotopic composition of BC and organic carbon (OC) aerosols collected at two locations in interior Alaska during the summer of 2013, as part of NASA's Carbon in Arctic Reservoirs Vulnerability Experiment. We isolated BC from fine air particulate matter (PM2.5) and measured its radiocarbon (Δ14C) content with accelerator mass spectrometry. We show that fires were the dominant contributor to variability in carbonaceous aerosol mass in interior Alaska during the summer by comparing our measurements with satellite data, measurements from an aerosol network and predicted concentrations from a fire inventory coupled to an atmospheric transport model. The Δ14C of BC from boreal fires was 131 ± 52‰ in the year 2013 when the Δ14C of atmospheric CO2 was 23 ± 3‰, corresponding to a mean fuel age of 20 years. Fire-emitted OC had a similar Δ14C (99 ± 21‰) as BC, but during background (low fire) periods OC (45 to 51‰) was more positive than BC (-354 to -57‰). We also analyzed the carbon and nitrogen elemental and stable isotopic composition of the PM2.5. Fire-emitted aerosol had an elevated carbon to nitrogen (C/N) ratio (29 ± 2) and δ15N (16 ± 4‰). Aerosol Δ14C and δ13C measurements were consistent with a mean depth of burning in organic soil horizons of 20 cm (and a range of 8 to 47 cm). Our measurements of fire-emitted BC and PM2.5 composition constrain the end-member of boreal forest fire contributions to aerosol deposition in the Arctic and may ultimately reduce uncertainties related to the impact of a changing boreal fire regime on the climate system. © 2015. 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/77905
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth System Science, University of California, Irvine, CA, United States; Now at Eidgenössische Technische Hochschule, Zürich, Switzerland; Woods Hole Research Center, Falmouth, MA, United States; Atmospheric and Environmental Research, Inc., Lexington, MA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Mouteva G,O,, Czimczik C,et al. Black carbon aerosol dynamics and isotopic composition in Alaska linked with boreal fire emissions and depth of burn in organic soils[J]. Global Biogeochemical Cycles,2015-01-01,29(11)