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Volume 16, issue 11 | Copyright

Special issue: CHemistry and AeRosols Mediterranean EXperiments (ChArMEx)...

Atmos. Chem. Phys., 16, 6841-6861, 2016
https://doi.org/10.5194/acp-16-6841-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 06 Jun 2016

Research article | 06 Jun 2016

Synergistic use of Lagrangian dispersion and radiative transfer modelling with satellite and surface remote sensing measurements for the investigation of volcanic plumes: the Mount Etna eruption of 25–27 October 2013

Pasquale Sellitto1, Alcide di Sarra2, Stefano Corradini3, Marie Boichu1,4, Hervé Herbin4, Philippe Dubuisson4, Geneviève Sèze1, Daniela Meloni2, Francesco Monteleone5, Luca Merucci3, Justin Rusalem4, Giuseppe Salerno6, Pierre Briole7, and Bernard Legras1 Pasquale Sellitto et al.
  • 1Laboratoire de Météorologie Dynamique, UMR8539, CNRS – École Normale Supérieure/Université Pierre et Marie Curie/École Polytechnique, Paris, France
  • 2ENEA, Laboratory for Observations and Analyses of the Earth and Climate (SSPT-PROTER-OAC), Rome, Italy
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
  • 4Laboratoire d'Optique Atmosphérique, UMR8518, CNRS – Université de Lille 1, Villeneuve d'Ascq, France
  • 5ENEA, UTMEA-TER, Palermo, Italy
  • 6Istituto Nazionale di Geofisica e Vulcanologia, Catania, Italy
  • 7Laboratoire de Géologie, UMR8538, CNRS – École Normale Supérieure, Paris, France

Abstract. In this paper we combine SO2 and ash plume dispersion modelling with satellite and surface remote sensing observations to study the regional influence of a relatively weak volcanic eruption from Mount Etna on the optical and micro-physical properties of Mediterranean aerosols. We analyse the Mount Etna eruption episode of 25–27 October 2013. The evolution of the plume along the trajectory is investigated by means of the FLEXible PARTicle Lagrangian dispersion (FLEXPART) model. The satellite data set includes true colour images, retrieved values of volcanic SO2 and ash, estimates of SO2 and ash emission rates derived from MODIS (MODerate resolution Imaging Spectroradiometer) observations and estimates of cloud top pressure from SEVIRI (Spinning Enhanced Visible and InfraRed Imager). Surface remote sensing measurements of aerosol and SO2 made at the ENEA Station for Climate Observations (35.52°N, 12.63°E; 50ma.s.l.) on the island of Lampedusa are used in the analysis. The combination of these different data sets suggests that SO2 and ash, despite the initial injection at about 7.0km altitude, reached altitudes around 10–12km and influenced the column average aerosol particle size distribution at a distance of more than 350km downwind. This study indicates that even a relatively weak volcanic eruption may produce an observable effect on the aerosol properties at the regional scale. The impact of secondary sulfate particles on the aerosol size distribution at Lampedusa is discussed and estimates of the clear-sky direct aerosol radiative forcing are derived. Daily shortwave radiative forcing efficiencies, i.e. radiative forcing per unit AOD (aerosol optical depth), are calculated with the LibRadtran model. They are estimated between −39 and −48Wm−2AOD−1 at the top of the atmosphere and between −66 and −49Wm−2AOD−1 at the surface, with the variability in the estimates mainly depending on the aerosol single scattering albedo. These results suggest that sulfate particles played a large role in the transported plume composition and radiative forcing, while the contribution by ash particles was small in the volcanic plume arriving at Lampedusa during this event.

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We combine plume dispersion and radiative transfer modelling, and satellite and surface remote sensing observations to study the regional influence of a relatively weak volcanic eruption from Mount Etna (25–27 October 2013) on the optical/micro-physical properties of Mediterranean aerosols. Our results indicate that even relatively weak volcanic eruptions may produce an observable effect on the aerosol properties at the regional scale, with a significant impact on the regional radiative balance.
We combine plume dispersion and radiative transfer modelling, and satellite and surface remote...
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