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Preprints
https://doi.org/10.5194/acpd-14-27731-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acpd-14-27731-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  06 Nov 2014

06 Nov 2014

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This preprint was under review for the journal ACP but the revision was not accepted.

Long term measurements of optical properties and their hygroscopic enhancement

M. Hervo1,*, K. Sellegri1, J. M. Pichon1, J. C. Roger1, and P. Laj2 M. Hervo et al.
  • 1Laboratoire de Météorologie Physique, CNRS UMR6016, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, Clermont-Ferrand, France
  • 2Laboratoire de Glaciologie et Geophysique de l'Environnement, Universitée de Grenoble, CNRS, Grenoble, France
  • *now at: Federal Office of Meteorology and Climatology, MeteoSwiss, 1530 Payerne, Switzerland

Abstract. Optical properties of aerosols were measured from the GAW Puy de Dôme station (1465 m) over a seven year period (2006–2012). The impact of hygroscopicity on aerosol optical properties was calculated over a two year period (2010–2011). The analysis of the spatial and temporal variability of the optical properties showed that while no long term trend was found, a clear seasonal and diurnal variation was observed on the extensive parameters (scattering, absorption). Scattering and absorption coefficients were highest during the warm season and daytime, in concordance with the seasonality and diurnal variation of the PBL height reaching the site. Intensive parameters (single scattering albedo, asymmetry factor, refractive index) did not show such a strong diurnal variability, but still indicated different values depending on the season. Both extensive and intensive optical parameters were sensitive to the air mass origin. A strong impact of hygroscopicity on aerosol optical properties was calculated, mainly on aerosol scattering, with a dependence on the aerosol type. At 90% humidity, the scattering factor enhancement (fσsca) was more than 4.4 for oceanic aerosol that have mixed with a pollution plume. Consequently, the aerosol radiative forcing was estimated to be 2.8 times higher at RH = 90% and 1.75 times higher at ambient RH when hygroscopic growth of the aerosol was considered. The hygroscopicity enhancement factor of the scattering coefficient was parameterized as a function of humidity and air mass type.

M. Hervo et al.

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M. Hervo et al.

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