Auxiliary material for
Biomass burning dominates brown carbon absorption
in the rural southeastern United States
R. A. Washenfelder1,2, A. R. Attwood1,2,3, C. A. Brock2, H. Guo4, L. Xu5, R. J. Weber4, N. L. Ng4,5, H. M.
Allen6,7, B. R. Ayres6, K. Baumann8, R. C. Cohen9,10, D. C. Draper6,11, K. C. Duffey10, E. Edgerton8, J. L. Fry6,
W. W. Hu1,12, J. L. Jimenez1,12, B. B. Palm1,12, P. Romer10, E. A. Stone13, P. J. Wooldridge10, and S. S.
Brown1,2
1
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
2
Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric
Administration, Boulder, CO, USA
3
Now at Horiba Scientific, Edison, NJ, USA
4
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
5
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA
6
Department of Chemistry, Reed College, Portland, OR, USA
7
Now at Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena,
CA, USA
8
Atmospheric Research & Analysis, Inc., Cary, NC, USA.
9
Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, USA
10
Department of Chemistry, University of California Berkeley, Berkeley, CA, USA
11
Now at Department of Chemistry, University of California Irvine, Irvine, CA, USA
12
Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, USA
13
Department of Chemistry, University of Iowa, Iowa City, Iowa, USA
Introduction
The auxiliary material includes 1 text, 1 table and 2 figure files, as described below.
1. text01.txt Text file with detailed description of instruments.
2.text02.txt Text file with description of uncertainty for calculated aerosol optical extinction.
3. ts02.txt Table file with error values used in aerosol optical extinction calculation
3.1 Column “Parameter”, name of parameter
3.2 Column “Technique”, source of parameter value
3.3 Column “Uncertainty”, uncertainty in parameter
3.4 Column “Source”, source of uncertainty value
4. ts02.txt Table file with density and refractive index for aerosol components
4.1 Column “Species”, name of chemical species
4.2 Column “Density (g cm-3)”, g cm-3, density of chemical species
4.3 Column “Reference”, reference for density of chemical species
4.4 Column “Refractive index”, unitless, refractive index of chemical species
4.5 Column “Reference”, reference for refractive index of chemical species
5. fs01.eps (a) Map of the southeastern U.S. region showing the location of the SOAS ground site and
SO2 sources from the U.S. EPA National Emissions Inventory 2011. (b) Wind rose showing the frequency
distribution of wind during 1 June – 15 July 2013 with legend indicating color code for wind speed in
m s-1.
6. fs02.eps Time series showing correlation of UV/VIS-PILS OM absorbance at 365 nm with (a)
anthropogenic gas tracers (O3, NOy, benzene, and toluene). (b); (b) biogenic aerosol and gas tracers
(AMS LO-OOA, AMS MO-OOA, isoprene, and the sum of MVK and methacrolein).