DOI: 10.5194/tc-14-4145-2020
论文题名: Proglacial icings as records of winter hydrological processes
作者: Chesnokova A. ; Baraër M. ; Bouchard É.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 4145
结束页码: 4164
语种: 英语
英文关键词: cryosphere
; hydrological modeling
; proglacial environment
; winter
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164428
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Chesnokova A.,Baraër M.,Bouchard É.. Proglacial icings as records of winter hydrological processes[J]. Cryosphere,2020-01-01,14(11)