Preprints
https://doi.org/10.5194/gmd-2022-247
https://doi.org/10.5194/gmd-2022-247
Submitted as: development and technical paper
21 Oct 2022
Submitted as: development and technical paper | 21 Oct 2022
Status: this preprint is currently under review for the journal GMD.

AerSett v1.0: A simple and straightforward model for the settling speed of big spherical atmospheric aerosol

Sylvain Mailler1,2, Laurent Menut1, Arineh Cholakian1, and Romain Pennel1 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. This study introduces AerSett v1.0 (AERosol SETTling version 1.0), a model giving the settling speed of big spherical aerosols in the atmosphere without going through an iterative equation resolution. We prove that, for all spherical atmospheric aerosols with diameter D up to 1000 µm, this direct and explicit method based on the drag coefficient formulation of Clift and Gauvin (1971) gives results within 2 % of the exact solution obtained from numerical resolution of a non-linear fixed-point equation. This error is acceptable considering the uncertainties on the drag coefficient formulations themselves. For D < 100 µm, the error is below 0.5 %. We hope that with this simple and straightforward model, more Chemistry-Tranport models and General Circulation models will be able to take into account large-particle correction to the settling speed of big spherical aerosol particles in the atmosphere, without performing an iterative and time-consuming calculation.

Sylvain Mailler et al.

Status: open (until 16 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Sylvain Mailler et al.

Sylvain Mailler et al.

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Short summary
Large or even "giant" particles of mineral dust exist in the atmosphere but, so far, solving an non-linear equation was needed to calculate the speed at which they fall to the atmosphere. The model we present, SettAer v1.0, provides a new and simple way of calculating their free-fall velocity in the atmosphere, which will be useful to anyone trying to understand and represent adequately the transport of giant dust particles by the wind.