气候变化领域集成服务门户(CCPortal): Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream

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DOI	10.5194/tc-10-2971-2016
	Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream
	Kim B.-H.; Lee C.-K.; Seo K.-W.; Lee W.S.; Scambos T.
发表日期	2016
ISSN	19940416
卷号	10 期号:6
英文摘要	We identify two previously unknown subglacial lakes beneath the stagnated trunk of the Kamb Ice Stream (KIS). Rapid fill-drain hydrologic events over several months are inferred from surface height changes measured by CryoSat-2 altimetry and indicate that the lakes are probably connected by a subglacial drainage network, whose structure is inferred from the regional hydraulic potential and probably links the lakes. The sequential fill-drain behavior of the subglacial lakes and concurrent rapid thinning in a channel-like topographic feature near the grounding line implies that the subglacial water repeatedly flows from the region above the trunk to the KIS grounding line and out beneath the Ross Ice Shelf. Ice shelf elevation near the hypothesized outlet is observed to decrease slowly during the study period. Our finding supports a previously published conceptual model of the KIS shutdown stemming from a transition from distributed flow to well-drained channelized flow of subglacial water. However, a water-piracy hypothesis in which the KIS subglacial water system is being starved by drainage in adjacent ice streams is also supported by the fact that the degree of KIS trunk subglacial lake activity is relatively weaker than those of the upstream lakes. © 2016 Author(s).
学科领域	CryoSat; drainage network; grounding line; lacustrine environment; satellite altimetry; subglacial environment; topographic mapping; water flow; Antarctic Ice Sheet; Antarctica; Kamb Ice Stream; Ross Ice Shelf; West Antarctic Ice Sheet; West Antarctica
语种	英语
scopus关键词	CryoSat; drainage network; grounding line; lacustrine environment; satellite altimetry; subglacial environment; topographic mapping; water flow; Antarctic Ice Sheet; Antarctica; Kamb Ice Stream; Ross Ice Shelf; West Antarctic Ice Sheet; West Antarctica
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/119532
作者单位	Department of Earth Science Education, Seoul National University, Seoul, 151-742, South Korea; Unit of Ice Sheet and Sea Level Changes, Korea Polar Research Institute, Incheon, 21990, South Korea; Polar Sciences, Korea University of Science and Technology, Daejeon, 34113, South Korea; National Snow and Ice Data Center, University of Colorado, Boulder, CO 80309-0449, United States
推荐引用方式 GB/T 7714	Kim B.-H.,Lee C.-K.,Seo K.-W.,et al. Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream[J],2016,10(6).
APA	Kim B.-H.,Lee C.-K.,Seo K.-W.,Lee W.S.,&Scambos T..(2016).Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream.Cryosphere,10(6).
MLA	Kim B.-H.,et al."Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream".Cryosphere 10.6(2016).