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Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream

Cited 2 time in scopus
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Title
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream
Other Titles
캠 빙하 하부의 활동성 빙저호 및 채널화된 빙저수 흐름
Authors
Lee, Won Sang
Seo, Ki-Weon
Lee, Choon-Ki
Kim, Byeong-Hoon
Ted Scambos
Subject
Physical Geography; Geology
Keywords
Channelized water flow; Kamb Ice Stream; Subglacial lake
Issue Date
2016
Citation
Lee, Won Sang, et al. 2016. "Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream". CRYOSPHERE, 10(6): 2971-2980.
Abstract
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. The subglacial drainage network structure is inferred from the regional hydraulic potential, and it 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 15 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 sub-glacial 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 20 KIS trunk subglacial lake activity is relatively weaker than those of the upstream lakes.
URI
http://repository.kopri.re.kr/handle/201206/5987
DOI
http://dx.doi.org/10.5194/tc-10-2971-2016
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