Articles | Volume 18, issue 18
https://doi.org/10.5194/acp-18-13511-2018
https://doi.org/10.5194/acp-18-13511-2018
Research article
 | 
24 Sep 2018
Research article |  | 24 Sep 2018

Shortwave radiative impact of liquid–liquid phase separation in brown carbon aerosols

Mehrnoush M. Fard, Ulrich K. Krieger, and Thomas Peter

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Cited articles

Alexander, D. T., Crozier, P. A., and Anderson, J. R.: Brown carbon spheres in East Asian outflow and their optical properties, Science, 321, 833–836, 2008. 
Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, Atmos. Chem. Phys., 6, 3131–3148, https://doi.org/10.5194/acp-6-3131-2006, 2006. 
Arnott, W. P., Moosmüller, H., Sheridan, P. J., Ogren, J. A., Raspet, R., Slaton, W. V., Hand, J. L., Kreidenweis, S. M., and Collett, J. L.: Photoacoustic and filter-based ambient aerosol light absorption measurements: Instrument comparisons and the role of relative humidity, J. Geophys. Res.-Atmos., 108, 4034, https://doi.org/10.1029/2002JD002165, 2003. 
ASTM: ASTM G173-12 Standard Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37 Tilted Surface, ASTM International, Reference Solar Spectral Irradiance, available at: http://rredc.nrel.gov/solar/spectra/am1.5/ (last access: 1 April 2017), 2012. 
Baumgardner, D. and Clarke, A.: Changes in aerosol properties with relative humidity in the remote southern hemisphere marine boundary layer, J. Geophys. Res.-Atmos., 103, 16525–16534, 1998. 
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Short summary
Atmospheric aerosol particles may undergo liquid–liquid phase separation (LLPS) when exposed to varying relative humidity, with an aqueous organic phase enclosing an aqueous inorganic phase below a threshold of relative humidity. Brown carbon (BrC) compounds will redistribute to the organic phase upon LLPS. We use numerical modeling to study the shortwave radiative impact of LLPS containing BrC and conclude that it is not significant for atmospheric aerosol.
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