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| Titel |
On the effects of vertical air velocity on winter precipitation types |
| VerfasserIn |
J. M. Thériault, R. E. Stewart |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 2 ; Nr. 7, no. 2 (2007-03-21), S.231-242 |
| Datensatznummer |
250004447
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| Publikation (Nr.) |
 copernicus.org/nhess-7-231-2007.pdf |
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| Zusammenfassung |
| 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. |
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