Insights into the Origin of Water Soluble Organic Carbon in Atmospheric Fine Particulate Matter

Figures & data

FIG. 1 Monthly average 1-in-6 day PM_2.5 water soluble organic carbon (WSOC) and water insoluble organic carbon (WIOC).

FIG. 2 (a) Seasonal comparison of PM_2.5 OC and WSOC. Solid lines represent the regression of the 1-in-6 day summer/fall observations and dashed lines represent the 1-in-6 day spring observations. (b) Seasonal comparison of 1-in-6 day observations of PM_2.5 WSOC with SOC as predicted by the EC tracer method. Regression statistics for these plots are shown in Table S2 in the supplemental materials accompanying this article.

FIG. 3 Seasonal comparison of measured PM_2.5 non-biomass burning WSOC (WSOC_NB) and (a) SOC as predicted by the EC-tracer method and (b) SOC predicted by CMB “other.”

FIG. 4 Monthly estimates of the contribution of biomass burning to PM_2.5 WSOC (WSOC_BB).

FIG. 5 Estimates of the contribution of biomass burning to PM_2.5 WSOC (WSOC_BB) during selected days at three sites in Detroit, MI.