Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Below-cloud scavenging by rain of atmospheric gases and particulates

Abstract : Below-cloud scavenging (BCS) by rain is one of the phenomena that control the removal of atmospheric pollutants from air. The present work introduces a detailed review of the most literature referred theories and parameterisations to describe the below-cloud scavenging by rain in air quality modelling. The theories and parameterisations in question concern the raindrop size distribution (RSD), the terminal velocity of raindrops, and the below-cloud scavenging coefficient for gaseous and particulate pollutants. 0D computations are run to calculate the latter coefficient with the help of the current theories and parameterisations thus extracted from the literature. As a result to improve the atmospheric modelling studies, it can be mentioned that the choice of the raindrop terminal velocity among the available parameterisations does not matter much and therefore, the practice of the most simple formulae is advised. On the other hand, a great dispersion on the scavenging coefficient (several orders of magnitude) is observed related to the variations of the RSD. Therefore, a great care is recommended in the choice of the RSD with respect to the type of rain and sampling duration involved (e.g. thunderstorm, widespread, shower, etc.; long or instantaneous sampling duration). Many uncertainties do remain due to the lack of precision in the experimental records after which the RSD parameterisations are established or to the poor level of accuracy of the theoretical models.
Type de document :
Article dans une revue
Liste complète des métadonnées
Contributeur : Yelva Roustan Connectez-vous pour contacter le contributeur
Soumis le : dimanche 11 février 2018 - 08:55:05
Dernière modification le : mardi 16 août 2022 - 14:44:26




Nora Duhanyan, Yelva Roustan. Below-cloud scavenging by rain of atmospheric gases and particulates. Atmospheric Environment, Elsevier, 2011, 45 (39), pp.7201-7217. ⟨10.1016/j.atmosenv.2011.09.002⟩. ⟨hal-01694098⟩



Consultations de la notice