Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL083436 |
Thermal Weakening, Convergent Flow, and Vertical Heat Transport in the Northeast Greenland Ice Stream Shear Margins | |
Holschuh, N.; Lilien, D. A.; Christianson, K. | |
2019-07-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:14页码:8184-8193 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Ice streams are bounded by abrupt transitions in speed called shear margins. Some shear margins are fixed by subglacial topography, but others are thought to be self-organizing, evolving by thermal feedback to ice viscosity and basal drag which govern the stress balance of ice sheets. Resistive stresses (and properties governing shear-margin formation) manifest nonuniquely at the surface, motivating the use of subsurface observations to constrain ice sheet models. In this study, we use ice-penetrating radar data to evaluate three 3-D thermomechanical models of the Northeast Greenland Ice Stream, focusing on model reproductions of ice temperature (a primary control on viscosity) and subsurface velocity. Data/model agreement indicates elevated temperatures in the Northeast Greenland Ice Stream margins, with depth-averaged temperatures between 2 degrees C and 6 degrees C warmer in the southeast margin compared to ice in streaming flow, driven by vertical heat transport rather than shear heating. This work highlights complexity in ice divergence across stagnant/streaming transitions. |
英文关键词 | ice sheet modeling radar shear margin Northeast Greenland Ice Stream model validation Greenland |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000481818900036 |
WOS关键词 | RADAR ATTENUATION ; SUBGLACIAL HYDROLOGY ; THWAITES GLACIER ; WEST ; MODEL ; INITIALIZATION ; TEMPERATURE ; ANTARCTICA ; FIRN |
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/185299 |
专题 | 气候变化 |
作者单位 | Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Holschuh, N.,Lilien, D. A.,Christianson, K.. Thermal Weakening, Convergent Flow, and Vertical Heat Transport in the Northeast Greenland Ice Stream Shear Margins[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(14):8184-8193. |
APA | Holschuh, N.,Lilien, D. A.,&Christianson, K..(2019).Thermal Weakening, Convergent Flow, and Vertical Heat Transport in the Northeast Greenland Ice Stream Shear Margins.GEOPHYSICAL RESEARCH LETTERS,46(14),8184-8193. |
MLA | Holschuh, N.,et al."Thermal Weakening, Convergent Flow, and Vertical Heat Transport in the Northeast Greenland Ice Stream Shear Margins".GEOPHYSICAL RESEARCH LETTERS 46.14(2019):8184-8193. |
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