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| DOI | 10.5194/tc-11-1371-2017 |
| Hypsometric amplification and routing moderation of Greenland ice sheet meltwater release | |
| Van As D.; Mikkelsen A.B.; Nielsen M.H.; Box J.E.; Liljedahl L.C.; Lindbäck K.; Pitcher L.; Hasholt B. | |
| 发表日期 | 2017 |
| ISSN | 19940416 |
| 卷号 | 11期号:3 |
| 英文摘要 | Concurrent ice sheet surface runoff and proglacial discharge monitoring are essential for understanding Greenland ice sheet meltwater release. We use an updated, wellconstrained river discharge time series from the Watson River in southwest Greenland, with an accurate, observation-based ice sheet surface mass balance model of the ∼12 000 km2 ice sheet area feeding the river. For the 2006-2015 decade, we find a large range of a factor of 3 in interannual variability in discharge. The amount of discharge is amplified ∼56 % by the ice sheet's hypsometry, i.e., area increase with elevation. A good match between river discharge and ice sheet surface meltwater production is found after introducing elevationdependent transit delays that moderate diurnal variability in meltwater release by a factor of 10-20. The routing lag time increases with ice sheet elevation and attains values in excess of 1 week for the upper reaches of the runoff area at ∼1800m above sea level. These multi-day routing delays ensure that the highest proglacial discharge levels and thus overbank flooding events are more likely to occur after multiday melt episodes. Finally, for the Watson River ice sheet catchment, we find no evidence of meltwater storage in or release from the en- and subglacial environments in quantities exceeding our methodological uncertainty, based on the good match between ice sheet runoff and proglacial discharge. © Author(s) 2017. |
| 学科领域 | amplification; catchment; flooding; glacial hydrology; glacier mass balance; hypsometry; meltwater; overbank flow; river discharge; runoff; sea level change; Arctic; Greenland; Greenland Ice Sheet; Watson River |
| 语种 | 英语 |
| scopus关键词 | amplification; catchment; flooding; glacial hydrology; glacier mass balance; hypsometry; meltwater; overbank flow; river discharge; runoff; sea level change; Arctic; Greenland; Greenland Ice Sheet; Watson River |
| 来源期刊 | Cryosphere
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/119388 |
| 作者单位 | Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen, 1350, Denmark; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, 1350, Denmark; Marine Science and Consulting, Peder Lykkes Vej 8, 4. th, Copenhagen, 2300, Denmark; Svensk Kärnbränslehantering AB, Research and Safety Assessment, Box 250, Stockholm, 101 24, Sweden; Norwegian Polar Institute, Framsentret, Postboks 6606, Langnes, Tromsø, 9296, Norway; Department of Geography, University of California Los Angeles, Los Angeles, CA 90095, United States |
| 推荐引用方式 GB/T 7714 | Van As D.,Mikkelsen A.B.,Nielsen M.H.,et al. Hypsometric amplification and routing moderation of Greenland ice sheet meltwater release[J],2017,11(3). |
| APA | Van As D..,Mikkelsen A.B..,Nielsen M.H..,Box J.E..,Liljedahl L.C..,...&Hasholt B..(2017).Hypsometric amplification and routing moderation of Greenland ice sheet meltwater release.Cryosphere,11(3). |
| MLA | Van As D.,et al."Hypsometric amplification and routing moderation of Greenland ice sheet meltwater release".Cryosphere 11.3(2017). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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