02 Nov 2023
 | 02 Nov 2023
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Microphysical modelling of aerosol scavenging by different types of clouds. Description and validation of the approach

Pascal Lemaitre, Arnaud Querel, Alexis Dépée, Alice Guerra Devigne, Marie Monier, Thibault Hiron, Chloé Soto Minguez, and Andrea Flossmann

Abstract. With dry deposition and below-cloud scavenging, in-cloud scavenging is one of the three components of aerosol transfer from the atmosphere to the ground. There is no experimental validation of in-cloud particle scavenging models for all cloud types that is not impacted by uncertainties concerning below-cloud scavenging. In this article, the choice was made to start with a recognised and validated microphysical cloud formation model (DESCAM) to extract a scheme of aerosol scavenging by clouds, valid for different cloud types. The resulting model works for the two most extreme precipitation clouds: from cumulonimbus to stratus. It is based on data accessible a priori from Numerical Weather Prediction (NWP) outputs, i.e., the intensity of the rain and the relative humidity in the cloud. The diagnostic of the altitude of the cloud base proves to be a key parameter, and accuracy in this regard is vital. This new in-cloud scavenging scheme can be used by long-distance (> 100 km) Atmospheric Transport Models (ATMs) or Global Climate Models (GCMs).

Pascal Lemaitre et al.

Status: open (until 31 Dec 2023)

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

Pascal Lemaitre et al.

Pascal Lemaitre et al.


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Short summary
A new in-cloud scavenging scheme is proposed. It is based on a microphysical model of cloud formation and may be applied to long-distance atmospheric transport models (>100 km) and climatic models. This model is established for the two most extreme precipitating cloud types, in terms of both relative humidity and vertical extension: cumulonimbus and stratus.