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. The particle mixing state plays a significant yet poorly quantified role inaerosol radiative forcing, especially for the mixing of dust (mineralabsorbing) and anthropogenic pollution (black carbon absorbing) over EastAsia. We have investigated the absorption enhancement of mixed-type aerosolsover East Asia by using the Aerosol Robotic Network observations andradiative transfer model calculations. The mixed-type aerosols exhibitsignificantly enhanced absorbing ability than the corresponding unmixed dustand anthropogenic aerosols, as revealed in the spectral behavior of absorbingaerosol optical depth, single scattering albedo, and imaginary refractiveindex. The aerosol radiative efficiencies for the dust, mixed-type, andanthropogenic aerosols are − 101.0, − 112.9, and − 98.3 Wm - 2 τ - 1 at the bottom of the atmosphere (BOA); − 42.3, − 22.5, and − 39.8 Wm - 2 τ - 1 at the top of the atmosphere (TOA); and 58.7,90.3, and 58.5 Wm - 2 τ - 1 in the atmosphere (ATM), respectively. TheBOA cooling and ATM heating efficiencies of the mixed-type aerosols aresignificantly higher than those of the unmixed aerosol types over the EastAsia region, resulting in atmospheric stabilization. In addition, themixed-type aerosols correspond to a lower TOA cooling efficiency, indicatingthat the cooling effect by the corresponding individual aerosol components ispartially counteracted. We conclude that the interaction between dust andanthropogenic pollution not only represents a viable aerosol formationpathway but also results in unfavorable dispersion conditions, bothexacerbating the regional air pollution in East Asia. Our results highlightthe necessity to accurately account for the mixing state of aerosols inatmospheric models over East Asia in order to better understand theformation mechanism for regional air pollution and to assess its impacts onhuman health, weather, and climate.

Radiative absorption enhancement of dust mixed with anthropogenic pollution over East Asia