气候变化领域集成服务门户(CCPortal): Proglacial icings as records of winter hydrological processes

CCPortal

DOI	10.5194/tc-14-4145-2020
	Proglacial icings as records of winter hydrological processes
	Chesnokova A.; Baraër M.; Bouchard É.
发表日期	2020
ISSN	19940416
起始页码	4145
结束页码	4164
卷号	14 期号:11
英文摘要	The ongoing warming of cold regions is affecting hydrological processes, causing deep changes, such as a ubiquitous increase in river winter discharges. The drivers of this increase are not yet fully identified mainly due to the lack of observations and field measurements in cold and remote environments. In order to provide new insights into the sources generating winter runoff, the present study explores the possibility of extracting information from icings that form over the winter and are often still present early in the summer. Primary sources detection was performed using time-lapse camera images of icings found in both proglacial fields and upper alpine meadows in June 2016 in two subarctic glacierized catchments in the upper part of the Duke watershed in the St. Elias Mountains, Yukon. As images alone are not sufficient to entirely cover a large and hydrologically complex area, we explore the possibility of compensating for that limit by using four supplementary methods based on natural tracers: (a) stable water isotopes, (b) water ionic content, (c) dissolved organic carbon, and (d) cryogenic precipitates. The interpretation of the combined results shows a complex hydrological system where multiple sources contribute to icing growth over the studied winter. Glaciers of all sizes, directly or through the aquifer, represent the major parent water source for icing formation in the studied proglacial areas. Groundwater-fed hillslope tributaries, possibly connected to suprapermafrost layers, make up the other detectable sources in icing remnants. If similar results are confirmed in other cold regions, they would together support a multi-causal hypothesis for a general increase in winter discharge in glacierized catchments. More generally, this study shows the potential of using icing formations as a new, barely explored source of information on cold region winter hydrological processes that can contribute to overcoming the paucity of observations in these regions. © 2020 Author(s).
英文关键词	cryosphere; hydrological modeling; proglacial environment; winter
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202050
作者单位	Hydrology Climate and Climate Change Laboratory, École de Technologie Supérieure, Montréal, H3C 1K3, Canada; Geography Program, University of Northern British Columbia, Prince George, V2N 4Z9, Canada
推荐引用方式 GB/T 7714	Chesnokova A.,Baraër M.,Bouchard É.. Proglacial icings as records of winter hydrological processes[J],2020,14(11).
APA	Chesnokova A.,Baraër M.,&Bouchard É..(2020).Proglacial icings as records of winter hydrological processes.Cryosphere,14(11).
MLA	Chesnokova A.,et al."Proglacial icings as records of winter hydrological processes".Cryosphere 14.11(2020).