Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL084183 |
Marine Ice Cliff Instability Mitigated by Slow Removal of Ice Shelves | |
Clerc, Fiona1; Minchew, Brent M.2; Behn, Mark D.3 | |
2019-11-11 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:21页码:12108-12116 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The accelerated calving of ice shelves buttressing the Antarctic Ice Sheet may form unstable ice cliffs. The marine ice cliff instability hypothesis posits that cliffs taller than a critical height (similar to 90 m) will undergo structural collapse, initiating runaway retreat in ice-sheet models. This critical height is based on inferences from preexisting, static ice cliffs. Here we show how the critical height increases with the timescale of ice-shelf collapse. We model failure mechanisms within an ice cliff deforming after removal of ice-shelf buttressing stresses. If removal occurs rapidly, the cliff deforms primarily elastically and fails through tensile-brittle fracture, even at relatively small cliff heights. As the ice-shelf removal timescale increases, viscous relaxation dominates, and the critical height increases to similar to 540 m for timescales greater than days. A 90-m critical height implies ice-shelf removal in under an hour. Incorporation of ice-shelf collapse timescales in prognostic ice-sheet models will mitigate the marine ice cliff instability, implying less ice mass loss. |
英文关键词 | marine ice cliff buttressing ice shelf Antarctic Ice Sheet ice-shelf collapse brittle-ductile transition marine ice cliff instability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000495620400001 |
WOS关键词 | STABILITY ; RETREAT ; FUTURE |
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/224990 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.MIT WHOI Joint Program Oceanog Appl Ocean Sci & E, Cambridge, MA 02139 USA; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA; 3.Boston Coll, Dept Earth & Environm Sci, Chestnut Hill, MA 02167 USA |
推荐引用方式 GB/T 7714 | Clerc, Fiona,Minchew, Brent M.,Behn, Mark D.. Marine Ice Cliff Instability Mitigated by Slow Removal of Ice Shelves[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(21):12108-12116. |
APA | Clerc, Fiona,Minchew, Brent M.,&Behn, Mark D..(2019).Marine Ice Cliff Instability Mitigated by Slow Removal of Ice Shelves.GEOPHYSICAL RESEARCH LETTERS,46(21),12108-12116. |
MLA | Clerc, Fiona,et al."Marine Ice Cliff Instability Mitigated by Slow Removal of Ice Shelves".GEOPHYSICAL RESEARCH LETTERS 46.21(2019):12108-12116. |
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