文章基本信息

标题：Variability in ice motion at a land-terminating Greenlandic outlet glacier: the role of channelized and distributed drainage systems
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作者：TOM COWTON ; PETER NIENOW ; ANDREW SOLE 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2016
卷号：62
期号：233
页码：451-466
DOI：10.1017/jog.2016.36
出版社：Cambridge University Press
摘要：ABSTRACT We use a combination of field observations and hydrological modelling to examine the mechanisms through which variability in meltwater input affects ice motion at a land-terminating Greenlandic outlet glacier. We find a close agreement between horizontal ice velocity, vertical ice velocity and modelled subglacial water pressure over the course of a melt season. On this basis, we argue that variation in horizontal and vertical ice velocity primarily reflects the displacement of basal ice during periods of cavity expansion and contraction, a process itself driven by fluctuations in basal water pressure originating in subglacial channels. This process is not captured by traditional sliding laws linking water pressure and basal velocity, which may hinder the simulation of realistic diurnal to seasonal variability in ice velocity in coupled models of glacial hydrology and dynamics.
关键词：glacier hydrology; ice dynamics; subglacial processes