期刊
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
卷 117, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011JF002220
关键词
-
资金
- UK Natural Environment Research Council (NERC)
- Edinburgh University Moss Centenary Scholarship
- Carnegie Trust
- RCUK Academic Fellowship
- NERC [NE/F021399/1, NE/F021380/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F021380/1, NE/F021399/1] Funding Source: researchfish
High resolution measurements of ice motion along a similar to 120 km transect in a land-terminating section of the GrIS reveal short-term velocity variations (<1 day), which are forced by rapid variations in meltwater input to the subglacial drainage system from the ice sheet surface. The seasonal changes in ice velocity at low elevations (<1000 m) are dominated by events lasting from 1 day to 1 week, although daily cycles are largely absent at higher elevations, reflecting different patterns of meltwater input. Using a simple model of subglacial conduit behavior we show that the seasonal record of ice velocity can be understood in terms of a time-varying water input to a channelized subglacial drainage system. Our investigation substantiates arguments that variability in the duration and rate, rather than absolute volume, of meltwater delivery to the subglacial drainage system are important controls on seasonal patterns of subglacial water pressure, and therefore ice velocity. We suggest that interpretations of hydro-dynamic behavior in land-terminating sections of the GrIS margin which rely on steady state drainage theories are unsuitable for making predictions about the effect of increased summer ablation on future rates of ice motion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据