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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-370
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-370
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  16 Jun 2020

16 Jun 2020

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A revised version of this preprint is currently under review for the journal ACP.

Particle Aging and Aerosol–Radiation Interaction Affect Volcanic Plume Dispersion: Evidence from Raikoke Eruption 2019

Lukas Ole Muser1, Gholam Ali Hoshyaripour1, Julia Bruckert1, Akos Horvath2, Elizaveta Malinina3, Sandra Peglow4, Fred J. Prata5, Alexei Rozanov3, Christian von Savigny4, Heike Vogel1, and Bernhard Vogel1 Lukas Ole Muser et al.
  • 1Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • 2Meteorological Institute, University of Hamburg, Germany
  • 3Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 4Institute of Physics, Greifswald University, Greifswald, Germany
  • 5AIRES Pty. Ltd., Mt Eliza, Victoria, Australia

Abstract. A correct and reliable forecast of volcanic plume dispersion is vital for aviation safety. This can only be achieved by representing all responsible physical and chemical processes (sources, sinks, and interactions) in the forecast models. The representation of the sources has been enhanced over the last decade, while the sinks and interactions have received less attention. In particular, aerosol dynamic processes and aerosol-radiation interaction are neglected so far. Here we address this gap by further developing the ICON-ART (ICOsahedral Nonhydrostatic – Aerosols and Reactive Trace gases) global modelling system to account for these processes. We use this extended model for the simulation of volcanic aerosol dispersion after the Raikoke eruption in June 2019. Additionally, we validate the simulation results with measurements from AHI (Advanced Himawari Imager), CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization), and OMPS-LP (Ozone Mapping and Profiling Suite – Limb Profiler). Our results show that around 50 % of very fine volcanic ash mass (particles with diameter d < 30 µm) is removed due to particle growth and aging. Furthermore, the maximum volcanic cloud top height rises more than 6 km over the course of 4 days after the eruption due to aerosol-radiation interaction. This is the first direct evidence that shows how cumulative effects of aerosol dynamics and aerosol-radiation interaction lead to a more precise forecast of very fine ash lifetime in volcanic clouds.

Lukas Ole Muser et al.

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Lukas Ole Muser et al.

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Latest update: 29 Sep 2020
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Short summary
Volcanic aerosols endanger aircraft and thus, disrupt air travel globally. For aviation safety, it is vital to know the location and lifetime of such aerosols in the atmosphere. Here we show that the interaction of volcanic particles with each other eventually reduces their atmospheric lifetime. Moreover, we demonstrate that sunlight heats these particles which lofts them several kilometers in the atmosphere. These findings serve for a more reliable forecast of volcanic aerosol dispersion.
Volcanic aerosols endanger aircraft and thus, disrupt air travel globally. For aviation safety,...
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