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• W4384564887 endingPage "108729" @default.
• W4384564887 startingPage "108729" @default.
• W4384564887 abstract "Global radiative forcing by carbonaceous aerosols is one of the largest sources of uncertainty in current climate models. The radiative impacts of brown carbon (BrC), a type of amorphous organic carbonaceous aerosol formed in biomass burning events, such as wildfires, remains poorly understood. Recently, the aggregation of spheres (monomers) of BrC was observed in wildfire smoke from various parts of the world. Aggregation could alter the optical properties and direct radiative forcing of BrC, yet very little is known about this phenomenon. This study improves the representation of BrC aerosols in climate models by enhancing the current understanding of their optical properties. In this study, we are motivated by the framework presented by Saleh et al. (2020) for the optical classification of particles in the black-brown continuum, and here we simplify categorization with two sub-classes of BrC: dark brown carbon (d-BrC) and weakly-absorbing brown carbon (w-BrC). We calculate and compare the mass absorption coefficient (MAC), mass scattering coefficient (MSC), single scattering albedo (SSA), and asymmetry parameter (g) of d-BrC and w-BrC and determine their absorption and scattering enhancements due to aggregation. Polydisperse diffusion limited cluster-cluster aggregation (p-DLCA) simulations generated 90 aggregates of varying monomer diameters, and discrete dipole approximation (DDA) was used to calculate optical properties of these aggregates at relevant refractive indices, monomer diameters, and incident wavelengths. We find that optical properties of BrC aggregates are more sensitive to the number and mean diameter of monomers than their polydispersity. d-BrC has almost twice the MAC of w-BrC at 350 nm, but w-BrC has MSC values almost double that of d-BrC. Both MAC and MSC for both types of aerosol decrease with wavelength. Aggregation enhances optical properties, with smaller size parameters and lower imaginary part of the complex refractive index of aggregates resulting in stronger absorption and scattering." @default.
• W4384564887 created "2023-07-18" @default.
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• W4384564887 date "2023-12-01" @default.
• W4384564887 modified "2023-09-23" @default.
• W4384564887 title "Aggregation-induced enhancements in aerosol absorption and scattering across the black-brown continuum" @default.
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• W4384564887 doi "https://doi.org/10.1016/j.jqsrt.2023.108729" @default.
• W4384564887 hasPublicationYear "2023" @default.
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