Submitted as: development and technical paper 19 Nov 2020

Submitted as: development and technical paper | 19 Nov 2020

Review status: this preprint is currently under review for the journal GMD.

Using an antidiffusive transport scheme in the vertical direction: a promising novelty for chemistry-transport models

Sylvain Mailler1,2, Romain Pennel1, Laurent Menut1, and Mathieu Lachâtre1 Sylvain Mailler et al.
  • 1LMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Research University, Sorbonne Université, CNRS, Palaiseau France
  • 2École des Ponts-ParisTech, Marne-la-Vallée, France

Abstract. The potential interest of the antidiffusive transport scheme proposed by Després et Lagoutière (1999) for resolving vertical transport in chemistry-transport models is investigated in an idealized framework with very encouraging results. We show that, compared to classical higher-order schemes, the Després et Lagoutière (1999) scheme reduces numerical diffusion and improves accuracy in idealized cases that are typical of atmospheric transport of tracers in chemistry-transport models. Increased accuracy and reduced diffusion is spectacular when, and only when vertical resolution is insufficient to properly resolve vertical gradients, which is very frequent in chemistry-transport models. Therefore, we think that this scheme is an extremely promising solution for reducing numerical diffusion in chemistry-transport models.

Sylvain Mailler et al.

Status: final response (author comments only)
Status: final response (author comments only)
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Sylvain Mailler et al.

Sylvain Mailler et al.


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Short summary
Representing advection of thin polluted plumes in numerical models is a challenging task since these models usually tend to excessively diffuse these plumes in the vertical direction. This numerical diffusion process is the cause of major difficulties in representing such dense and thin polluted plumes in numerical models. We propose here, and test in an academic framework, a novel solution to this problem through the use of an anti-diffusive advection scheme in the vertical direction.