| DOI: | 10.5194/cp-12-1601-2016
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| Scopus记录号: | 2-s2.0-84982810902
|
| 论文题名: | The role of basal hydrology in the surging of the Laurentide Ice Sheet |
| 作者: | Roberts W.H.G.; Payne A.J.; Valdes P.J.
|
| 刊名: | Climate of the Past
|
| ISSN: | 18149324
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| 出版年: | 2016
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| 卷: | 12, 期:8 | | 起始页码: | 1601
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| 结束页码: | 1617
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| 语种: | 英语
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| Scopus关键词: | basal ice
; glacier surge
; Heinrich event
; Last Glacial Maximum
; Laurentide Ice Sheet
; sensitivity analysis
; sliding
; water depth
; Canada
; Hudson Strait
|
| 英文摘要: | We use the Glimmer ice sheet model to simulate periodic surges over the Laurentide Ice Sheet during the Last Glacial Maximum. In contrast to previous studies we use the depth of water at the base of the ice sheet as the switch for these surges.We find that the surges are supported within the model and are quite robust across a very wide range of parameter choices, in contrast to many previous studies where surges only occur for rather specific cases. The robustness of the surges is likely due to the use of water as the switch mechanism for sliding. The statistics of the binge-purge cycles resemble observed Heinrich events. The events have a period of between 10 and 15 thousand years and can produce fluxes of ice from the mouth of Hudson Strait of 0.05 Sv-a maximum flux of 0.06 Sv is possible. The events produce an ice volume of 2.50×106 km3, with a range of 4.30×106-1.90×106 km3 possible. We undertake a suite of sensitivity tests varying the sliding parameter, the water drainage scheme, the sliding versus water depth parameterisation and the resolution, all of which support the ice sheet surges. This suggests that internally triggered ice sheet surges were a robust feature of the Laurentide Ice Sheet and are a possible explanation for the observed Heinrich events. © 2016 Author(s). |
| 资助项目: | NERC, Natural Environment Research Council
; NERC, Natural Environment Research Council
; NERC, Natural Environment Research Council
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/48986
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Roberts W.H.G.,Payne A.J.,Valdes P.J.. The role of basal hydrology in the surging of the Laurentide Ice Sheet[J]. Climate of the Past,2016-01-01,12(8)
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