On the effects of vertical air velocity on winter precipitation types

Thériault, Julie M. et Stewart, R. E. (2007). « On the effects of vertical air velocity on winter precipitation types ». Natural Hazards and Earth System Science, 7(2), pp. 231-242.

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Résumé

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.

Type:	Article de revue scientifique
Informations complémentaires:	© Author(s) 2007. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Mots-clés ou Sujets:	Air mass, cloud microphysics, numerical model, precipitation (climatology), temperature inversion, temperature profile, temporal evolution, warm front
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 14:26
Dernière modification:	19 avr. 2016 19:59
Adresse URL :	http://archipel.uqam.ca/id/eprint/7963

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