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Emissions of Black Carbon, Organic, and Inorganic Aerosols From Biomass Burning in North America and Asia in 2008Reliable assessment of the impact of aerosols emitted from boreal forest fires on the Arctic climate necessitates improved understanding of emissions and the microphysical properties of carbonaceous (black carbon (BC) and organic aerosols (OA)) and inorganic aerosols. The size distributions of BC were measured by an SP2 based on the laser-induced incandescence technique on board the DC-8 aircraft during the NASA ARCTAS campaign. Aircraft sampling was made in fresh plumes strongly impacted by wildfires in North America (Canada and California) in summer 2008 and in those transported from Asia (Siberia in Russia and Kazakhstan) in spring 2008. We extracted biomass burning plumes using particle and tracer (CO, CH3CN, and CH2Cl2) data. OA constituted the dominant fraction of aerosols mass in the submicron range. The large majority of the emitted particles did not contain BC. We related the combustion phase of the fire as represented by the modified combustion efficiency (MCE) to the emission ratios between BC and other species. In particular, we derived the average emission ratios of BC/CO = 2.3 +/- 2.2 and 8.5 +/- 5.4 ng/cu m/ppbv for BB in North America and Asia, respectively. The difference in the BC/CO emission ratios is likely due to the difference in MCE. The count median diameters and geometric standard deviations of the lognormal size distribution of BC in the BB plumes were 136-141 nm and 1.32-1.36, respectively, and depended little on MCE. These BC particles were thickly coated, with shell/core ratios of 1.3-1.6. These parameters can be used directly for improving model estimates of the impact of BB in the Arctic.
Document ID
20110011186
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kondo, Y.
(Tokyo Univ. Japan)
Matsui, H.
(Tokyo Univ. Japan)
Moteki, N.
(Tokyo Univ. Japan)
Sahu, L.
(Tokyo Univ. Japan)
Takegawa, N.
(Tokyo Univ. Japan)
Kajino, M.
(Tokyo Univ. Japan)
Zhao, Y.
(California Univ. Davis, CA, United States)
Cubison, M. J.
(Colorado Univ. Boulder, CO, United States)
Jimenez, J. L.
(Colorado Univ. Boulder, CO, United States)
Vay, S.
(NASA Langley Research Center Hampton, VA, United States)
Diskin, G. S.
(NASA Langley Research Center Hampton, VA, United States)
Anderson, B.
(NASA Langley Research Center Hampton, VA, United States)
Wisthaler, A.
(Innsbruck Univ. Austria)
Mikoviny, T.
(Innsbruck Univ. Austria)
Fuelberg, H. E.
(Florida State Univ. Tallahassee, FL, United States)
Blake, D. R.
(California Univ. Irvine, CA, United States)
Huey, G.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Weinheimer, A. J.
(National Center for Atmospheric Research Boulder, CO, United States)
Knapp, D. J.
(National Center for Atmospheric Research Boulder, CO, United States)
Brune, W. H.
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Publication Information
Publication: Journal of Geophysical Research
Volume: 116
ISSN: 0148-0227
Subject Category
Geophysics
Report/Patent Number
NF1676L-12652
Funding Number(s)
CONTRACT_GRANT: NNX08D39G
WBS: WBS 281945.02.39.01.77
Distribution Limits
Public
Copyright
Other

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