Figures & data
FIG. 1 (a) bExt versus CNAerosol for all APSS Sizes, (b) bAbs versus CNAerosol for all APSS Sizes. Slopes of these data represent the optical cross-sections (σ) for each APSS size. The quality of each fit (hidden by the log/log nature of the plot) is provided in as a 2 – sigma precision in each fit.
FIG. 2 Experimental QExt and QAbs (█ and ⊗) versus particle diameter. Lines are the modeled QExt (- – -) and QAbs (____) from fitting the real and imaginary refractive index to the experimental data using Mie Theory.
TABLE 1 Measured APSS diameters, extinction and absorption cross-sections, extinction and absorption efficiency factors, and SSA
FIG. 3 (a) Measured extinction enhancement factors (EExt-Exp) for all coated APSS sizes. (b) Measured absorption enhancement factors (EAbs-Exp) for all coated APSS sizes. The 327 nm data (gray) is placed on an offset axis (right axis) for clarity. Uncertainty in EExp is that propagated through both uncoated and coated optical cross sections. The extinction and absorption enhancement predicted by 2-Layer Mie theory (EExt-Mod, EAbs-Mod) is shown as dashed lines. Uncertainty in modeled EExt-Mod and EAbs-Mod shown as solid lines. All uncertainties shown are 1 standard deviation.
FIG. 4 Ratio of PSAP and PAS measured absorption for all uncoated APSS (solid circles) and the 327 nm APSS coated with Oleic acid (open circles).
FIG. A1 Response of extinction and absorption optical cross-sections (σExt and σAbs) of APSS to sample flow temperature. Above approximately 50°C the APSS dye appears to degrade.
