Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL079751 |
Retrieval of Englacial Firn Aquifer Thickness From Ice-Penetrating Radar Sounding in Southeastern Greenland | |
Chu, W.1; Schroeder, D. M.1,2; Siegfried, M. R.1 | |
2018-11-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:21页码:11770-11778 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | An extensive perennial firn aquifer was previously mapped in Helheim Glacier, Southeast Greenland. However, critical constraints on aquifer thickness have been so far unobtainable without expensive field observations. Here we present a novel method that combines very high frequency airborne deep ice radar and ice sheet modeling to retrieve aquifer thickness and its evolution at Helheim Glacier. Using 2012-2014 radar measurements, we identify three aquifers of 4-25 m thick, with a total area of 1,934 km(2) and water storage of 2.2 +/- 1.5 Gt, about half the volume of previous estimates. The aquifer system is dynamic, and its thickness varies interannually at a rate similar to changes in surface mass balance. The rapid upstream migration of the saturated aquifer implies that this feature has the potential to increase its storage potential in upper Greenland. Together, a combination of very high- and ultra high frequency radar sounding provides a powerful tool to characterize englacial firn aquifers. Plain Language Summary Along the accumulation zone of the Greenland ice sheet, meltwater generated at the ice surface can infiltrate porous snow and firn and produce englacial aquifers. Thus far, early studies have mapped the extent of firn aquifers using a combination of ground-based and snow accumulation radar sounders. However, because englacial water can create additional attenuation for ice-penetrating radar systems, critical constraints on aquifer thickness have been so far unobtainable without logistical intensive field observations. Here we design a novel method that combines deep ice radar sounding and ice sheet modeling to overcome this challenge. We apply this technique to Helheim Glacier and find three aquifers of 4-25 m thick that changes over time with climate. Together, the combination of deep ice and snow accumulation radar sounding provides a powerful method to the understanding of the role of firn aquifers in Greenland Ice Sheet. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451832600029 |
WOS关键词 | MELTWATER STORAGE ; GROUNDING-ZONE ; THWAITES GLACIER ; SHEET ; SCALE ; VARIABILITY ; EVOLUTION ; ROUGHNESS ; PLANETARY ; BED |
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/25649 |
专题 | 气候变化 |
作者单位 | 1.Stanford Univ, Dept Geophys, Stanford, CA 94305 USA; 2.Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA |
推荐引用方式 GB/T 7714 | Chu, W.,Schroeder, D. M.,Siegfried, M. R.. Retrieval of Englacial Firn Aquifer Thickness From Ice-Penetrating Radar Sounding in Southeastern Greenland[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(21):11770-11778. |
APA | Chu, W.,Schroeder, D. M.,&Siegfried, M. R..(2018).Retrieval of Englacial Firn Aquifer Thickness From Ice-Penetrating Radar Sounding in Southeastern Greenland.GEOPHYSICAL RESEARCH LETTERS,45(21),11770-11778. |
MLA | Chu, W.,et al."Retrieval of Englacial Firn Aquifer Thickness From Ice-Penetrating Radar Sounding in Southeastern Greenland".GEOPHYSICAL RESEARCH LETTERS 45.21(2018):11770-11778. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论