A Parameterization of the Microphysical Processes Forming Many Types of Winter Precipitation

Thériault, Julie M. et Stewart, Ronald E. (2010). « A Parameterization of the Microphysical Processes Forming Many Types of Winter Precipitation ». Journal of the Atmospheric Sciences, 67(5), pp. 1492-1508.

Fichier(s) associé(s) à ce document :

Prévisualisation	PDF Télécharger (1MB)

Résumé

Several types of precipitation, such as freezing rain, ice pellets, and wet snow, are commonly observed during winter storms. The objective of this study is to better understand the formation of these winter precipitation types. To address this issue, detailed melting and refreezing of precipitation was added onto an existing bulk microphysics scheme. These modifications allow the formation of mixed-phase particles and these particles in turn lead to, or affect, the formation of many of the other types of precipitation. The precipitation type characteristics, such as the mass content, liquid fraction, and threshold diameters formed during a storm over St John’s, Newfoundland, Canada, are studied and compared with observations. Many of these features were reproduced by the model. Sensitivity experiments with the model were carried out to examine the dependence of precipitation characteristics in this event on thresholds of particle evolution in the new parameterization.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	Mixed precipitation, Forecasting, Parameterization, Freezing precipitation, Hydrometeorology, Cloud microphysics
Unité d'appartenance:	Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par:	Julie Mireille Thériault
Date de dépôt:	21 mars 2016 14:28
Dernière modification:	19 avr. 2016 18:06
Adresse URL :	http://archipel.uqam.ca/id/eprint/7961

Modifier les métadonnées (propriétaire du document)

Statistiques