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Knowledge on the microphysical properties of atmospheric aerosols is essential to better\udevaluate their radiative forcing. This paper presents an estimate of\udthe real part of the refractive indices (n) and effective densities\ud(ρeff) of chemically segregated atmospheric aerosols in Guangzhou, China.\udVacuum aerodynamic diameter, chemical compositions, and light-scattering\udintensities of individual particles were simultaneously measured by a single-particle aerosol mass spectrometer (SPAMS) during the fall of 2012.\udOn the basis of Mie theory, n at a wavelength of 532 nm and ρeff were estimated for 17 particle types in four categories: organics\ud(OC), elemental carbon (EC), internally mixed EC and OC (ECOC), and Metal-rich. The results indicate the presence of spherical or nearly spherical\udshapes for the majority of particle types, whose partial scattering cross-section\udversus sizes were well fitted to Mie theoretical modeling results. While\udsharing n in a narrow range (1.47–1.53), majority of particle types\udexhibited a wide range of ρeff (0.87–1.51 g cm−3). The OC\udgroup is associated with the lowest ρeff\ud(0.87–1.07 g cm−3), and the Metal-rich group with the highest ones\ud(1.29–1.51 g cm−3). It is noteworthy that a specific EC type exhibits\uda complex scattering curve versus size due to the presence of both compact\udand irregularly shaped particles. Overall, the results on the detailed\udrelationship between physical and chemical properties benefits future\udresearch on the impact of aerosols on visibility and climate

atmospheric chemistry and physics

The real part of the refractive indices and effective densities for chemically segregated ambient aerosols in Guangzhou measured by a single-particle aerosol mass spectrometer