| DOI: | 10.5194/tc-7-1095-2013
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| Scopus记录号: | 2-s2.0-84880553923
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| 论文题名: | A balanced water layer concept for subglacial hydrology in large-scale ice sheet models |
| 作者: | Goeller S; , Thoma M; , Grosfeld K; , Miller H
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2013
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| 卷: | 7, 期:4 | | 起始页码: | 1095
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| 结束页码: | 1106
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| 语种: | 英语
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| 英文关键词: | dominance
; flow modeling
; hydrology
; ice movement
; ice sheet
; mass balance
; parameterization
; subglacial environment
; thermomechanics
; water budget
; Southern Ocean
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| 英文摘要: | There is currently no doubt about the existence of a widespread hydrological network under the Antarctic Ice Sheet, which lubricates the ice base and thus leads to increased ice velocities. Consequently, ice models should incorporate basal hydrology to obtain meaningful results for future ice dynamics and their contribution to global sea level rise. Here, we introduce the balanced water layer concept, covering two prominent subglacial hydrological features for ice sheet modeling on a continental scale: the evolution of subglacial lakes and balance water fluxes. We couple it to the thermomechanical ice-flow model RIMBAY and apply it to a synthetic model domain. In our experiments we demonstrate the dynamic generation of subglacial lakes and their impact on the velocity field of the overlaying ice sheet, resulting in a negative ice mass balance. Furthermore, we introduce an elementary parametrization of the water flux-basal sliding coupling and reveal the predominance of the ice loss through the resulting ice streams against the stabilizing influence of less hydrologically active areas. We point out that established balance flux schemes quantify these effects only partially as their ability to store subglacial water is lacking. © Author(s) 2013. |
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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/74976
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| 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: | Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
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| Recommended Citation: | |
Goeller S,, Thoma M,, Grosfeld K,et al. A balanced water layer concept for subglacial hydrology in large-scale ice sheet models[J]. Cryosphere,2013-01-01,7(4)
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