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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-68
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-68
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Apr 2020

28 Apr 2020

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This preprint is currently under review for the journal GMD.

Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin

Laura Palacios-Peña1, Jerome D. Fast2, Enrique Pravia-Sarabia1, and Pedro Jiménez-Guerrero1 Laura Palacios-Peña et al.
  • 1Physics of the Earth, Regional Campus of International Excellence “Campus Mare Nostrum", University of Murcia, Spain
  • 2Pacific Northwest National Laboratory, Richland, WA, USA

Abstract. Aerosol size distribution is, among others, a key property of atmospheric aerosols when trying to establish the uncertainties related to aerosol-radiation (ARI) and aerosol-clouds (ACI) interactions. These interactions ultimately depend on the size distribution through optical properties as aerosol optical depth (AOD) or cloud microphysical properties. Hence, the main objective of this work is to study the impact of the representation of aerosol size distribution on aerosol optical properties over Central Europe, and particularly over the Mediterranean Basin during a summertime aerosol episode. To fulfill this objective, a sensitivity test has been carried out using the WRF-Chem on-line model. The test consisted on modifying the parameters which define a log-normal size distribution (the geometric diameter, from now on DG, and the standard deviation, SG) by 10, 20 and 50 %. Results reveal that the reduction in the SG of the accumulation mode leads to the largest impacts in the AOD representation due to a transfer of particles from the accumulation mode to the coarse mode. A reduction in the DG of the accumulation mode has also an influence on AOD representation since particles in this mode are assumed to be smaller. In addition, an increase in the DG of the coarse mode produces a redistribution through the total size distribution by relocating particles from the finer modes to the coarse.

Laura Palacios-Peña et al.

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Laura Palacios-Peña et al.

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Data and code of the GMD for review publication "Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin" L. Palacios-Peña, J. D. Fast, E. Pravia-Sarabia, and P. Jiménez-Guerrero https://doi.org/10.5281/zenodo.3768076

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Data and code of the GMD for review publication "Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin" L. Palacios-Peña, J. D. Fast, E. Pravia-Sarabia, and P. Jiménez-Guerrero https://doi.org/10.5281/zenodo.3768076

Laura Palacios-Peña et al.

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Short summary
The main objective of this work is to study the impact of the representation of aerosol size distribution on aerosol optical properties over Central Europe, and the Mediterranean Basin during a summertime aerosol episode using the WRF-Chem on-line model. Results reveal that the reduction in the standard deviation of the accumulation mode leads to the largest impacts in the AOD representation due to a transfer of particles from the accumulation mode to the coarse mode.
The main objective of this work is to study the impact of the representation of aerosol size...
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