An ice-sheet scale comparison of eskers with modelled subglacial drainage routes
An ice-sheet scale comparison of eskers with modelled subglacial drainage routes
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Eskers 与模拟冰下排水路线的冰盖规模比较
DOI:
10.1016/j.geomorph.2015.06.016
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发表时间:
2015
期刊:
影响因子:
3.9
通讯作者:
Livingstone S
中科院分区:
文献类型:
--
作者:
Livingstone S
Eskers record the signature of channelised meltwater drainage during deglaciation providing vital information on the nature and evolution of subglacial drainage. In this paper, we compare the spatial pattern of eskers beneath the former Laurentide Ice Sheet with subglacial drainage routes diagnosed at discrete time intervals from the results of a numerical ice-sheet model. Perhaps surprisingly, we show that eskers predominantly occur in regions where modelled subglacial water flow is low. Eskers and modelled subglacial drainage routes were found to typically match over distances of < 10 km, and most eskers show a better agreement with the routes close to the ice margin just prior to deglaciation. This supports a time-transgressive esker pattern, with formation in short (< 10 km) segments of conduit close behind a retreating ice margin, and probably associated with thin, stagnant or sluggish ice. Esker-forming conduits were probably dominated by supraglacially fed meltwater inputs. We also show that modelled subglacial drainage routes containing the largest concentrations of meltwater show a close correlation with palaeo-ice stream locations. The paucity of eskers along the terrestrial portion of these palaeo-ice streams and meltwater routes is probably because of the prevalence of distributed drainage and the high erosion potential of fast-flowing ice.
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DOI:
--
发表时间:
1966
期刊:
影响因子:
--
作者:
R. J. Price
通讯作者:
R. J. Price
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
J. Aylsworth;W. Shilts
通讯作者:
W. Shilts
影响因子:
3.4
作者:
J. Kleman;C. Hättestrand;Ingmar Borgström;A. Stroeven
通讯作者:
A. Stroeven
影响因子:
4
作者:
M. Burke;T. Brennand;A. Perkins
通讯作者:
A. Perkins
影响因子:
3.4
作者:
Gulley, J. D.;Grabiec, M.;Glowacki, P.
通讯作者:
Glowacki, P.