Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074986 |
Poststagnation Retreat of Kamb Ice Stream's Grounding Zone | |
Horgan, H. J.1; Hulbe, C.2; Alley, R. B.3,4; Anandakrishnan, S.3,4; Goodsell, B.1; Taylor-Offord, S.1; Vaughan, M. J.5 | |
2017-10-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:19 |
文章类型 | Article |
语种 | 英语 |
国家 | New Zealand; USA |
英文摘要 | Despite the importance of grounding zone sedimentation for ice sheet stability and ice sheet history, evidence for sedimentary deposits beneath West Antarctica's modern grounding zone remains sparse. Seismic surveying shows that Kamb Ice Stream has no detectable grounding zone deposit. As grounding zone deposition relies strongly on ice flow, the absence of a deposit suggests that the transition from the ice stream to the ice shelf has moved after stagnation of Kamb Ice Stream. Further support for a recent grounding zone occupation comes from satellite imagery of sub-ice shelf channel features that likely originated at previous grounding-zone locations. These features begin 25km seaward of the current grounding zone and cut across ice flow streak lines. We estimate that retreat to the modern grounding-zone position was abrupt at rates >0.2km a(-1). Plain Language Summary The location where an ice sheet goes afloat and becomes an ice shelf is termed the grounding zone. This zone can be thought of as the ice sheet's coastline, and its position determines how much the ice sheets contribute to global sea level. The flow of ice sheets, and the melt of the bottom of ice shelves, result in sediment being deposited at the grounding zone. This sediment can stabilize the ice sheet margin and provides a record of where and how long the ice sheet has occupied a certain location. Here we use acoustic surveying methods to examine the grounding zone of Kamb Ice Stream in West Antarctica. We find that the grounding zone migrated to its current position within the last 150years, indicating that this part of the ice sheet is more dynamic than previously thought. |
英文关键词 | glaciology ice sheet dynamics grounding zone |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413921300034 |
WOS关键词 | SUBGLACIAL LAKE WHILLANS ; WEST ANTARCTICA ; ROSS SEA ; BENEATH ; SHEET ; TILL ; SHELVES ; LINE ; FLOW ; BED |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26889 |
专题 | 气候变化 |
作者单位 | 1.Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand; 2.Univ Otago, Sch Surveying, Dunedin, New Zealand; 3.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 4.Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA; 5.Univ Otago, Dept Geol, Dunedin, New Zealand |
推荐引用方式 GB/T 7714 | Horgan, H. J.,Hulbe, C.,Alley, R. B.,et al. Poststagnation Retreat of Kamb Ice Stream's Grounding Zone[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(19). |
APA | Horgan, H. J..,Hulbe, C..,Alley, R. B..,Anandakrishnan, S..,Goodsell, B..,...&Vaughan, M. J..(2017).Poststagnation Retreat of Kamb Ice Stream's Grounding Zone.GEOPHYSICAL RESEARCH LETTERS,44(19). |
MLA | Horgan, H. J.,et al."Poststagnation Retreat of Kamb Ice Stream's Grounding Zone".GEOPHYSICAL RESEARCH LETTERS 44.19(2017). |
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