Abstract
We estimated source-based aerosol optical properties for polydisperse aerosols according to a chemical-species-resolved mass contribution method based on source apportionment. We investigated the sensitivity of aerosol optical properties based on PM2.5 (particulate matter that have a diameter of less than 2.5 micrometers) monitoring results. These aerosols were composed of ions, metals, elemental carbon, and water-soluble organic carbon which includes humic-like carbon substances and water-soluble organic carbon. We calculated aerosols’ extinction coefficients based on the PM2.5 composition data and the results of a multivariate receptor model (Solver for Mixture Problem model, SMP). Based on the mass concentration of chemical composition and nine sources calculated with the SMP receptor model, we estimated the size-resolved mass extinction efficiencies for each aerosol source using a multilinear regression model. Consequently, this study quantitatively determined the size resolved sources contributing to the apportionment-based aerosol optical properties and calculated their respective contributions. The results show that source-resolved mass concentrations and extinction coefficients had varying contributions. This discrepancy between the source-based mass concentration and extinction coefficient was mainly due to differences between the source-dependent aerosol size distribution and the aerosol optical properties from different sources.
Highlights
Atmospheric aerosols originate from a wide variety of natural and anthropogenic sources.A combination of various sources and physical and chemical processes generates these atmospheric aerosols
As the properties (MEE, mass absorption efficiency (MAE), and mass scattering efficiency (MSE)) are size-dependent for each chemical compound and source, there are many ranges depending on geometric standard deviation (GSD) and dg
The source-based mass extinction efficiency (MEE) for polydisperse aerosols was estimated according to the results of the source apportionment-based chemical-species-resolved mass contribution
Summary
Atmospheric aerosols originate from a wide variety of natural and anthropogenic sources. A combination of various sources and physical and chemical processes generates these atmospheric aerosols. The optical properties of atmospheric aerosols play a key role in earth’s radiation budget. They depend on size distribution, chemical composition, mass concentration, density, and wavelength. These optical properties are represented by the refractive index.
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