Supplementary material to "Modeling actinic flux and photolysis frequencies in dense biomass burning plumes"

S1 Parameterisation of wavelength-dependenciesFigure S1.Parameterisation of the wavelength-dependence of various parameters based on Eq. 4. The single scattering co-albedo is defined as 1-SSA (see Section 2.5).For detailed description and discussion, see text.This Supplement demonstrates the applicability of Eq. 4, which we propose in Section 2.5 as a general parameterisation approach for wavelength-dependent parameters.Each panel in Figure S1 shows another wavelength-dependent parameter, as indicated by the panel titles.Black dots in Figure S1 represent ground truths, based on measurements performed during plume transect 5 (see also Figure 5).For ground truth values of the brown carbon imaginary refractive index (left panel), we use the 5 wavelength-dependence measured by the SAEB instrument (see Section 3.2) and a magnitude retrieved as described in Section 4.2.Ground truths for extinction coefficient, single scattering absorption and asymmetry parameter were calculated with the Mie model, assuming aerosol microphysical properties as described in Section 4. From the particle refractive indices used in this study (see Section 4), only the brown carbon imaginary refractive index features a significant and well-known wavelengthdependence; thus it is the only refractive index shown here.We fit the proposed parameterisation (Eq.4) to the to the ground 10