DOI: 10.5194/tc-10-2971-2016
Scopus记录号: 2-s2.0-85002615610
论文题名: Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream
作者: Kim B ; -H ; , Lee C ; -K ; , Seo K ; -W ; , Lee W ; S ; , Scambos T
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 6 起始页码: 2971
结束页码: 2980
语种: 英语
英文关键词: 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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75028
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth Science Education, Seoul National University, Seoul, South Korea; Unit of Ice Sheet and Sea Level Changes, Korea Polar Research Institute, Incheon, South Korea; Polar Sciences, Korea University of Science and Technology, Daejeon, South Korea; National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States
Recommended Citation:
Kim B,-H,, Lee C,et al. Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream[J]. Cryosphere,2016-01-01,10(6)