globalchange  > 科学计划与规划
DOI: 10.1002/2015GL063897
Evolution of brown carbon in wildfire plumes
Author: Forrister H.; Liu J.; Scheuer E.; Dibb J.; Ziemba L.; Thornhill K.L.; Anderson B.; Diskin G.; Perring A.E.; Schwarz J.P.; Campuzano-Jost P.; Day D.A.; Palm B.B.; Jimenez J.L.; Nenes A.; Weber R.J.
Source Publication: Geophysical Research Letters
ISSN: 0094-9585
EISSN: 1944-9316
Publishing Year: 2015
Volume: 42, Issue:11
pages begin: 4623
pages end: 4630
Language: 英语
Keyword: biomass burning ; bleaching ; brown carbon ; lifetime ; photooxidation ; plume evolution
Scopus Keyword: Aerosols ; Bleaching ; Electromagnetic wave absorption ; Fires ; Light absorption ; NASA ; Photooxidation ; Thickness measurement ; Aerosol light absorption ; Atmospheric stability ; Biomass-burning ; Brown carbons ; Coating thickness ; Lifetime ; Mass concentration ; Plume evolution ; Atmospheric movements
English Abstract: Particulate brown carbon (BrC) in the atmosphere absorbs light at subvisible wavelengths and has poorly constrained but potentially large climate forcing impacts. BrC from biomass burning has virtually unknown lifecycle and atmospheric stability. Here, BrC emitted from intense wildfires was measured in plumes transported over 2 days from two main fires, during the 2013 NASA SEAC4RS mission. Concurrent measurements of organic aerosol (OA) and black carbon (BC) mass concentration, BC coating thickness, absorption Ångström exponent, and OA oxidation state reveal that the initial BrC emitted from the fires was largely unstable. Using back trajectories to estimate the transport time indicates that BrC aerosol light absorption decayed in the plumes with a half-life of 9 to 15 h, measured over day and night. Although most BrC was lost within a day, possibly through chemical loss and/or evaporation, the remaining persistent fraction likely determines the background BrC levels most relevant for climate forcing. ©2015. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
Appears in Collections:科学计划与规划

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Affiliation: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States

Recommended Citation:
Forrister H.,Liu J.,Scheuer E.,et al. Evolution of brown carbon in wildfire plumes[J]. Geophysical Research Letters,2015-01-01,42(11).
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