On the effects of vertical air velocity on winter precipitation types
Type de ressource
Auteurs/contributeurs
- Thériault, J. M. (Auteur)
- Stewart, R. E. (Auteur)
Titre
On the effects of vertical air velocity on winter precipitation types
Résumé
Abstract. The various precipitation types formed within winter storms (such as snow, wet snow and freezing rain) often lead to very hazardous weather conditions. These types of precipitation often occur during the passage of a warm front as a warm air mass ascends over a cold air mass. To address this issue further, we used a one-dimensional kinematic cloud model to simulate this gentle ascent (≤10 cm/s) of warm air. The initial temperature profile has an above 0°C inversion, a lower subfreezing layer, and precipitation falls from above the temperature inversion. The cloud model is coupled to a double-moment microphysics scheme that simulates the production of various types of winter precipitation. The results are compared with those from a previous study carried out in still air. Based on the temporal evolution of surface precipitation, snow reaches the surface significantly faster than in still air whereas other precipitation types including freezing rain and ice pellets have a shorter duration. Overall, even weak background vertical ascent has an important impact on the precipitation reaching the surface, the time of the elimination of the melting layer, and also the evolution of the lower subfreezing layer.
Publication
Natural Hazards and Earth System Sciences
Volume
7
Numéro
2
Pages
231-242
Date
2007-03-21
Abrév. de revue
Nat. Hazards Earth Syst. Sci.
Langue
en
ISSN
1684-9981
Consulté le
06/11/2024 16:07
Catalogue de bibl.
DOI.org (Crossref)
Autorisations
Référence
Thériault, J. M., & Stewart, R. E. (2007). On the effects of vertical air velocity on winter precipitation types. Natural Hazards and Earth System Sciences, 7(2), 231–242. https://doi.org/10.5194/nhess-7-231-2007
Auteur·e·s
Lien vers cette notice