Supplementary Material to "biomass Burning Aerosol over the Amazon: Analysis of Aircraft, Surface and Satellite Observations Using a Global Aerosol Model"

S1. Calculation of aerosol water uptake for simulated aerosol optical depth S1.1 Description of the online water uptake calculationIn GLOMAP, the water uptake for each soluble aerosol component is calculated online according to Zdanovskii-Stokes-Robinson (ZSR) theory, which estimates the liquid water content as a function of solute molarity (Stokes and Robinson, 1966).For POM in the soluble modes, we assigned an hygroscopicity consistent with a water uptake per mole at 65% of that of SO 4 (Mann et al., 2010).This is likely to be an upper estimate of aerosol hygroscopicity as discussed in Reddington et al. (2016).In the calculation of AOD, we used the resulting hourly mean aerosol wet radii and refractive indices to calculate the hourly aerosol extinction.