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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 7
Atmos. Chem. Phys., 4, 1759–1769, 2004
https://doi.org/10.5194/acp-4-1759-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Atmos. Chem. Phys., 4, 1759–1769, 2004
https://doi.org/10.5194/acp-4-1759-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  03 Sep 2004

03 Sep 2004

Optical properties in the UV and visible spectral region of organic acids relevant to tropospheric aerosols

C. E. Lund Myhre and C. J. Nielsen C. E. Lund Myhre and C. J. Nielsen
  • Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0372 Oslo, Norway

Abstract. Refractive and absorption indices in the UV and visible region of selected aqueous organic acids relevant to tropospheric aerosols are reported. The acids investigated are the aliphatic dicarboxylic acids oxalic, malonic, tartronic, succinic and glutaric acid. In addition we report data for pyruvic, pinonic, benzoic and phthalic acid. To cover a wide range of conditions we have investigated the aqueous organic acids at different concentrations spanning from highly diluted samples to concentrations close to saturation. The density of the investigated samples is reported and a parameterisation of the absorption and refractive index that allows the calculation of the optical constants of mixed aqueous organic acids at different concentrations is presented. The single scattering albedo is calculated for two size distributions using measured and a synthetic set of optical constants. The results show that tropospheric aerosols consisting of only these organic acids and water have a pure scattering effect.

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