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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-2020-62
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-62
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 17 Apr 2020

Submitted as: model description paper | 17 Apr 2020

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This preprint is currently under review for the journal GMD.

New strategies for vertical transport in chemistry-transport models: application to the case of the Mount Etna eruption on March 18, 2012 with CHIMERE v2017r4

Mathieu Lachatre1, Sylvain Mailler1,2, Laurent Menut1, Solène Turquety1, Pasquale Sellitto3, Henda Guermazi3, Giuseppe Salerno4, Tommaso Caltabiano4, and Elisa Carboni5 Mathieu Lachatre et al.
  • 1LMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Université, Sorbonne Université, CNRS,Palaiseau, France
  • 2École des Ponts, Université Paris-Est, 77455 Champs-sur-Marne, France
  • 3Laboratoire Inter-Universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, CNRS, Université Paris EstCréteil et Université de Paris, Institut Pierre Simon Laplace, Créteil, France
  • 4Istituto Nazionale di Geosica e Vulcanologia, Osservatorio Etneo, Catania, Italy
  • 5Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, Oxfordshire, UK

Abstract. Excessive numerical diffusion is one of the major limitations in the representation of long-range transport by chemistry-transport models. In the present study, we focus on excessive diffusion in the vertical direction, which has been shown to be a major issue, and we explore three possible ways to address this problem: increase vertical resolution, use an advection scheme with antidiffusive properties, and represent more accurately the vertical wind. This study is done with the CHIMERE chemistry-transport model, for the March 18, 2012 eruption of Mount Etna, which has released about 3 kt of sulphur dioxide in the atmosphere into a plume that has been observed by satellite instruments (IASI and OMI) for several days. The change from the classical Van Leer et al., (1977) scheme to the Després and Lagoutière (1999) antidiffusive scheme in the vertical direction has been shown to bring the largest improvement to model outputs in terms of preserving the thin plume emitted by the volcano. To a lesser extent, improved representation of the vertical wind field has also been shown to reduce plume dispersion. Both these changes help reducing vertical diffusion in the model as much as a brute-force approach (increasing vertical resolution).

Mathieu Lachatre et al.

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Mathieu Lachatre et al.

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Short summary
Excessive numerical diffusion is a major limitations in the representation of long-range transport atmospheric models. In the present study, we focus on excessive diffusion in the vertical direction. We explore three possible ways to address this problem: increase vertical resolution, use an advection scheme with antidiffusive properties, and represent more accurately the vertical wind. This study focused on a particular volcanic eruption event to improve atmospheric transport modelling.
Excessive numerical diffusion is a major limitations in the representation of long-range...
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