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DOI | 10.1029/2019GL086521 |
Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet | |
Pitcher, Lincoln H.1,2; Smith, Laurence C.2,3,4; Gleason, Colin J.5; Miege, Clement6,7; Ryan, Johnny C.3; Hagedorn, Birgit8; van As, Dirk9; Chu, Winnie10; Forster, Richard R.7 | |
2020-05-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Denmark |
英文摘要 | Meltwater runoff from the Greenland Ice Sheet (GrIS) significantly contributes to sea level rise and is the dominant driver of enhanced mass loss. While most melt occurs during summer, little is known about its seasonal and/or interannual retention within the GrIS. Here, we document evidence of runoff during winter, similar to 4 months after summer melt. Ground-penetrating radar and borehole surveys in the proglacial Isortoq River reveal slowly flowing water beneath >0.5 m of river ice. Geochemical analysis of this water indicates previous contact with the ice sheet bed. Comparable surveys in proglacial rivers draining four neighboring catchments found no winter drainage, despite a brief surface melt event similar to 10 days prior. We attribute the observed runoff to residual meltwater storage and release enabled by a >600 m deep trough beneath Isunguata Sermia, but not neighboring glaciers. We conclude that the GrIS bed can stay wet and drain small amounts of meltwater year-round. |
英文关键词 | Greenland Ice Sheet subglacial hydrology meltwater retention meltwater storage surface melt winter |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000536639500034 |
WOS关键词 | SEA-LEVEL RISE ; SUPRAGLACIAL STREAMS ; SUBMARINE MELT ; STORAGE ; SURFACE ; WATER ; ACCELERATION ; BENEATH ; RUNOFF ; DRIVEN |
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/279914 |
专题 | 气候变化 |
作者单位 | 1.Univ Colorado, CIRES, Boulder, CO 80309 USA; 2.Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90024 USA; 3.Brown Univ, Inst Brown Environm & Soc, Providence, RI 02912 USA; 4.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA; 5.Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01003 USA; 6.Rutgers State Univ, Dept Geog, Piscataway, NJ USA; 7.Univ Utah, Dept Geog, Salt Lake City, UT USA; 8.Sustainable Earth Res LLC, Anchorage, AK USA; 9.Geol Survey Denmark & Greenland GEUS, Copenhagen, Denmark; 10.Stanford Univ, Dept Geophys, Stanford, CA 94305 USA |
推荐引用方式 GB/T 7714 | Pitcher, Lincoln H.,Smith, Laurence C.,Gleason, Colin J.,et al. Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(9). |
APA | Pitcher, Lincoln H..,Smith, Laurence C..,Gleason, Colin J..,Miege, Clement.,Ryan, Johnny C..,...&Forster, Richard R..(2020).Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet.GEOPHYSICAL RESEARCH LETTERS,47(9). |
MLA | Pitcher, Lincoln H.,et al."Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet".GEOPHYSICAL RESEARCH LETTERS 47.9(2020). |
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