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DOI | 10.1029/2020GL088901 |
Moulin volumes regulate subglacial water pressure on the Greenland Ice Sheet | |
M. D. Covington; J. D. Gulley; C. Trunz; J. Mejia; W. Gadd | |
2020-10-09 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Meltwater inputs to moulins regulate Greenland Ice Sheet sliding speeds by controlling water pressure in the most connected regions of the subglacial drainage system. While moulin storage capacities are a critical control on subglacial water pressure, few observations exist to constrain storage. Using direct observations inside moulins, we show that moulin cross‐sectional areas can be at least 500 m2, far greater than is observed at the surface or assumed in models. Moulin water level measurements and numerical modeling reveal that diurnal variability in moulin water pressure is highly attenuated in moulins with large storage volumes (~3% ice pressure), relative to moulins with smaller storage volumes (~25% ice pressure). Because large variability in moulin water pressure is linked to processes that ultimately reduce ice sliding speeds, ice sliding speeds in areas drained by large moulins may be more sensitive to long‐term increases in meltwater than areas drained by small moulins. |
领域 | 气候变化 |
URL | 查看原文 |
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/297908 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | M. D. Covington,J. D. Gulley,C. Trunz,et al. Moulin volumes regulate subglacial water pressure on the Greenland Ice Sheet[J]. Geophysical Research Letters,2020. |
APA | M. D. Covington,J. D. Gulley,C. Trunz,J. Mejia,&W. Gadd.(2020).Moulin volumes regulate subglacial water pressure on the Greenland Ice Sheet.Geophysical Research Letters. |
MLA | M. D. Covington,et al."Moulin volumes regulate subglacial water pressure on the Greenland Ice Sheet".Geophysical Research Letters (2020). |
条目包含的文件 | 条目无相关文件。 |
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