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This paper presents a new dataset of laboratory measurements of the shortwave (SW) spectral complex refractive index and single-scattering albedo (SSA) for global mineral dust aerosols of varying origin and composition. Our results show that the dust refractive index and SSA vary strongly from source to source, mostly due to particle iron content changes. We recommend that source-dependent values of the SW spectral refractive index and SSA be used in models and remote sensing applications.
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ACP | Articles | Volume 19, issue 24
Atmos. Chem. Phys., 19, 15503–15531, 2019
https://doi.org/10.5194/acp-19-15503-2019

Special issue: Simulation chambers as tools in atmospheric research (AMT/ACP/GMD...

Atmos. Chem. Phys., 19, 15503–15531, 2019
https://doi.org/10.5194/acp-19-15503-2019

Research article 19 Dec 2019

Research article | 19 Dec 2019

Complex refractive indices and single-scattering albedo of global dust aerosols in the shortwave spectrum and relationship to size and iron content

Claudia Di Biagio et al.

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Revised manuscript accepted for ACP
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Cited articles

Arimoto, R., Balsam, W., and Schloesslin, C.: Visible spectroscopy of aerosol particles collected on filters: iron-oxide minerals, Atmos. Environ., 36, 89–96, 2002. 
Arnott, W., Hamasha, K., Moosmüller, H., Sheridan, P. J., and Ogren, J. A.: Towards aerosol light-absorption measurements with a 7-wavelength aethalometer: Evaluation with a photoacoustic instrument and 3-wavelength nephelometer, Aerosol Sci. Tech., 39, 17–29, 2005. 
Balkanski, Y., Schulz, M., Claquin, T., and Guibert, S.: Reevaluation of Mineral aerosol radiative forcings suggests a better agreement with satellite and AERONET data, Atmos. Chem. Phys., 7, 81–95, https://doi.org/10.5194/acp-7-81-2007, 2007. 
Bangalath, H. K. and Stenchikov, G.: Sensitivity of the Middle East–North African Tropical Rainbelt to Dust Shortwave Absorption: A High-Resolution AGCM Experiment, J. Climate, 29, 7103–7126, https://doi.org/10.1175/JCLI-D-15-0827.1, 2016. 
Betzer, P., Carder, K., Duce, R., and Merrill, J.: Long range transport of giant mineral aerosol particles, Nature, 336, 568–571, 1988. 
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This paper presents a new dataset of laboratory measurements of the shortwave (SW) spectral complex refractive index and single-scattering albedo (SSA) for global mineral dust aerosols of varying origin and composition. Our results show that the dust refractive index and SSA vary strongly from source to source, mostly due to particle iron content changes. We recommend that source-dependent values of the SW spectral refractive index and SSA be used in models and remote sensing applications.
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