Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL073417 |
Decoding ice sheet behavior using englacial layer slopes | |
Holschuh, Nicholas1; Parizek, Byron R.2,3; Alley, Richard B.3,4; Anandakrishnan, Sridhar3,4 | |
2017-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The complex flow fields of the Antarctic and Greenland ice sheets deform layers deposited as snow at the ice sheet surface, leaving a record of the regional flow history and/or local transitions in basal boundary conditions within the geometry of ice sheet layers. Ice-penetrating radar reveals these layers, but radar data interpretations are limited by the challenges of quantitatively and reproducibly comparing observations with model output. We present a conceptual framework that relates along-track reflector slope to gradients in the steady state velocity field of ice sheets. This method makes effective use of englacial reflectors in regions where it is challenging to image continuous layers and avoids the error propagation inherent to tracer-transport methods, developing the potential for formal radar data assimilation in future modeling studies. We apply our method to radar data collected at the grounding line of Whillans Ice Stream, where enhanced bed friction produces characteristic reflector slopes reproducible using a higher-order ice flow model. Plain Language Summary Radar imagery collected to measure ice thickness in Antarctica and Greenland provides a vast amount of information about the internal structure of the ice sheets. Most notably, these data show that the ice sheets are not simply flat layers of ice deposited as snow at the surface. They are complex, folded masses that record the history of ice flow in the geometry of their internal layers. This study establishes a new interpretation framework that allows us to identify unique characteristics of the ice structures and relate them to their formation mechanism, a task that has been historically difficult to perform. Developing methods like this one, which help to describe and interpret the internal structure of the ice sheets in an automated and quantitative way, improves our understanding of the processes that controlled historic ice sheet behavior, allowing us to make better predictions of future ice sheet behavior. |
英文关键词 | glaciers Antarctica radar modeling Greenland |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404382600036 |
WOS关键词 | WEST ANTARCTICA ; ISOCHRONE GEOMETRY ; PENETRATING RADAR ; CORE SITE ; GREENLAND ; STREAM ; STRATIGRAPHY ; MODEL ; FLOW ; DOME |
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/25626 |
专题 | 气候变化 |
作者单位 | 1.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA; 2.Penn State Univ, Math & Geosci, Du Bois, PA USA; 3.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 4.Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | Holschuh, Nicholas,Parizek, Byron R.,Alley, Richard B.,et al. Decoding ice sheet behavior using englacial layer slopes[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(11). |
APA | Holschuh, Nicholas,Parizek, Byron R.,Alley, Richard B.,&Anandakrishnan, Sridhar.(2017).Decoding ice sheet behavior using englacial layer slopes.GEOPHYSICAL RESEARCH LETTERS,44(11). |
MLA | Holschuh, Nicholas,et al."Decoding ice sheet behavior using englacial layer slopes".GEOPHYSICAL RESEARCH LETTERS 44.11(2017). |
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