Preprints
https://doi.org/10.5194/egusphere-2023-357
https://doi.org/10.5194/egusphere-2023-357
12 Apr 2023
 | 12 Apr 2023
Status: this preprint is open for discussion.

An optimisation method to improve modelling of wet deposition in atmospheric transport models: applied to FLEXPART v10.4

Stijn Van Leuven, Pieter De Meutter, Johan Camps, Piet Termonia, and Andy Delcloo

Abstract. Wet deposition plays a crucial role in the removal of aerosols from the atmosphere. Yet, large uncertainties remain in its implementation in atmospheric transport models, specifically in the parameterisation schemes that are often used. Recently, a new wet deposition scheme was introduced in FLEXPART. The input parameters for its wet deposition scheme can be altered by the user, and may be case-specific. In this paper, a new method is presented to optimise the wet scavenging rates in atmospheric transport models such as FLEXPART. The optimisation scheme is tested in a case study of aerosol-attached 137Cs following the Fukushima Daiichi nuclear power plant accident. From this, improved values for the wet scavenging input parameters in FLEXPART are suggested.

Stijn Van Leuven et al.

Status: open (until 07 Jun 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on egusphere-2023-357', Juan Antonio Añel, 06 May 2023 reply
    • AC1: 'Reply on CEC1', Stijn Van Leuven, 08 May 2023 reply
  • RC1: 'Comment on egusphere-2023-357', Sheng Fang, 07 May 2023 reply
    • AC2: 'Reply on RC1', Stijn Van Leuven, 22 May 2023 reply
  • RC2: 'Comment on egusphere-2023-357', Nina Iren Kristiansen, 25 May 2023 reply

Stijn Van Leuven et al.

Model code and software

An optimisation method to improve modelling of wet deposition in atmospheric transport models: applied to FLEXPART v10.4 Stijn Van Leuven https://doi.org/10.5281/zenodo.7789039

Stijn Van Leuven et al.

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Short summary
Precipitation collects airborne particles and deposits these on the ground. This process is called wet deposition and greatly determines how airborne radioactive particles (released routinely or accidental) contaminate the surface. In this work we present a new method to improve the calculation of wet deposition in computer models. We apply this method to the existing model FLEXPART by simulating the Fukushima nuclear accident (2011), and show that it improves the simulation of wet deposition.