Biomass burning dominates brown carbon absorption in the rural southeastern United States

Washenfelder, R. A.; Attwood, A. R.; Brock, C. A.; Guo, H.; Xu, L.; Weber, R. J.; Ng, N. L.; Allen, H. M.; Ayres, B. R.; Baumann, K.; Cohen, R. C.; Draper, D. C.; Duffey, K. C.; Edgerton, E.; Fry, J. L.; Hu, W. W.; Jimenez, J. L.; Palm, B. B.; Romer, P.; Stone, E. A.; Wooldridge, P. J.; Brown, S. S.

doi:10.1002/2014gl062444

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i

Biomass burning dominates brown carbon absorption in the rural southeastern United States

2015
By Washenfelder, R. A. ; Attwood, A. R. ; Brock, C. A. ; ...
Source: Geophysical Research Letters, 42(2), 653-664.

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Journal Title:

Geophysical Research Letters
Personal Author:

Washenfelder, R. A. ; Attwood, A. R. ; Brock, C. A. ; Guo, H. ; Xu, L. ; ... More +

Washenfelder, R. A. ; Attwood, A. R. ; Brock, C. A. ; Guo, H. ; Xu, L. ; Weber, R. J. ; Ng, N. L. ; Allen, H. M. ; Ayres, B. R. ; Baumann, K. ; Cohen, R. C. ; Draper, D. C. ; Duffey, K. C. ; Edgerton, E. ; Fry, J. L. ; Hu, W. W. ; Jimenez, J. L. ; Palm, B. B. ; Romer, P. ; Stone, E. A. ; Wooldridge, P. J. ; Brown, S. S. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) Less -
Description:

Brown carbon aerosol consists of light-absorbing organic particulate matter with wavelength-dependent absorption. Aerosol optical extinction, absorption, size distributions, and chemical composition were measured in rural Alabama during summer 2013. The field site was well located to examine sources of brown carbon aerosol, with influence by high biogenic organic aerosol concentrations, pollution from two nearby cities, and biomass burning aerosol. We report the optical closure between measured dry aerosol extinction at 365nm and calculated extinction from composition and size distribution, showing agreement within experiment uncertainties. We find that aerosol optical extinction is dominated by scattering, with single-scattering albedo values of 0.940.02. Black carbon aerosol accounts for 919% of the total carbonaceous aerosol absorption at 365nm, while organic aerosol accounts for 99%. The majority of brown carbon aerosol mass is associated with biomass burning, with smaller contributions from biogenically derived secondary organic aerosol.
Source:

Geophysical Research Letters, 42(2), 653-664.
DOI:

http://dx.doi.org/10.1002/2014gl062444
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4310063
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Submitted
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urn:sha256:78cf583dd63cfd8645a59604d9ff52e5580b58b6dc4bfa439207fedc9ead485e
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https://repository.library.noaa.gov/view/noaa/21924/noaa_21924_DS1.pdf
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Biomass burning dominates brown carbon absorption in the rural southeastern United States

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