气候变化领域集成服务门户(CCPortal): Role of sublimation and riming in the precipitation distribution in the Kananaskis Valley; Alberta; Canada

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DOI	10.5194/hess-23-4097-2019
	Role of sublimation and riming in the precipitation distribution in the Kananaskis Valley; Alberta; Canada
	Poirier É.; Thériault J.M.; Leriche M.
发表日期	2019
ISSN	1027-5606
起始页码	4097
结束页码	4111
卷号	23 期号:10
英文摘要	The phase of precipitation and its distribution at the surface can affect water resources and the regional water cycle of a region. A field project was held in March-April 2015 on the eastern slope of the Canadian Rockies to document precipitation characteristics and associated atmospheric conditions. During the project, 60% of the particles documented were rimed in relatively warm and dry conditions. Rain-snow transitions also occurred aloft and at the surface in sub-saturated conditions. Ice-phase precipitation falling through a saturated atmospheric layer with temperatures >0 ° C will start melting. In contrast, if the melting layer is sub-saturated, the ice-phase precipitation undergoes sublimation, which increases the depth of the rain-snow transition. In this context, this study investigates the role of sublimation and riming in precipitation intensity and type reaching the surface in the Kananaskis Valley, Alberta, during March-April 2015. To address this, a set of numerical simulations of an event of mixed precipitation observed at the surface was conducted. This event on 31 March 2015 was documented with a set of devices at the main observation site (Kananaskis Emergency Services, KES), including a precipitation gauge, disdrometer, and micro rain radar. Sensitivity experiments were performed to assess the impacts of temperature changes from sublimation and the role of the production of graupel (riming) aloft in the surface precipitation evolution. A warmer environment associated with no temperature changes from sublimation leads to a peak in the intensity of graupel at the surface. When the formation of graupel is not considered, the maximum snowfall rate occurred at later times. Results suggest that unrimed snow reaching the surface is formed on the western flank and is advected eastward. In contrast, graupel would form aloft in the Kananaskis Valley. The cooling from sublimation and melting by rimed particles increases the vertical shear near KES. Overall, this study illustrated that the presence of graupel influenced the surface evolution of precipitation type in the valley due to the horizontal transport of precipitation particles. © 2019 Author(s).
语种	英语
scopus关键词	Atmospheric temperature; Emergency services; Landforms; Melting; Meteorological instruments; Snow; Sublimation; Water resources; Atmospheric conditions; Horizontal transport; Precipitation characteristics; Precipitation distribution; Precipitation gauges; Precipitation intensity; Saturated conditions; Surface precipitation; Rain; hydrological cycle; melting; precipitation (climatology); precipitation intensity; radar; snow; sublimation; water resource; Alberta; Canada; Kananaskis Valley; Rocky Mountains
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159594
作者单位	Poirier, É., Centre ESCER, Departement of Earth and Atmospheric Sciences, Université du Québec À Montreál, Montreál, QC, Canada; Thériault, J.M., Centre ESCER, Departement of Earth and Atmospheric Sciences, Université du Québec À Montreál, Montreál, QC, Canada; Leriche, M., Centre ESCER, Departement of Earth and Atmospheric Sciences, Université du Québec À Montreál, Montreál, QC, Canada, Laboratoire d'Aérologie, CNRS, Université Paul Sabatier, Toulouse, France
推荐引用方式 GB/T 7714	Poirier É.,Thériault J.M.,Leriche M.. Role of sublimation and riming in the precipitation distribution in the Kananaskis Valley; Alberta; Canada[J],2019,23(10).
APA	Poirier É.,Thériault J.M.,&Leriche M..(2019).Role of sublimation and riming in the precipitation distribution in the Kananaskis Valley; Alberta; Canada.Hydrology and Earth System Sciences,23(10).
MLA	Poirier É.,et al."Role of sublimation and riming in the precipitation distribution in the Kananaskis Valley; Alberta; Canada".Hydrology and Earth System Sciences 23.10(2019).