Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1713892115 |
Aspect controls the survival of ice cliffs on debris-covered glaciers | |
Buri, Pascal1; Pellicciotti, Francesca2 | |
2018-04-24 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:17页码:4369-4374 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; England |
英文摘要 | Supraglacial ice cliffs exist on debris-covered glaciers worldwide, but despite their importance as melt hot spots, their life cycle is little understood. Early field observations had advanced a hypothesis of survival of north-facing and disappearance of south-facing cliffs, which is central for predicting the contribution of cliffs to total glacier mass losses. Their role as windows of energy transfer suggests they may explain the anomalously high mass losses of debris-covered glaciers in High Mountain Asia (HMA) despite the insulating debris, currently at the center of a debated controversy. We use a 3D model of cliff evolution coupled to very high-resolution topographic data to demonstrate that ice cliffs facing south (in the Northern Hemisphere) disappear within a few months due to enhanced solar radiation receipts and that aspect is the key control on cliffs evolution. We reproduce continuous flattening of south-facing cliffs, a result of their vertical gradient of incoming solar radiation and sky view factor. Our results establish that only north-facing cliffs are recurrent features and thus stable contributors to the melting of debris-covered glaciers. Satellite observations and mass balance modeling confirms that few south-facing cliffs of small size exist on the glaciers of Langtang, and their contribution to the glacier volume losses is very small (similar to 1%). This has major implications for the mass balance of HMA debris-covered glaciers as it provides the basis for new parameterizations of cliff evolution and distribution to constrain volume losses in a region where glaciers are highly relevant as water sources for millions of people. |
英文关键词 | debris cover ice cliffs glaciers High Mountain Asia modeling |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430697500052 |
WOS关键词 | HIMALAYAN GLACIERS ; ENERGY-BALANCE ; EVEREST REGION ; CLIMATE-CHANGE ; MASS-BALANCE ; NEPAL ; DYNAMICS ; PATTERNS ; MODEL ; MELT |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204904 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.ETH, Hydrol & Water Resources Management Grp, Inst Environm Engn, CH-8093 Zurich, Switzerland; 2.Northumbria Univ, Dept Geog, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England |
推荐引用方式 GB/T 7714 | Buri, Pascal,Pellicciotti, Francesca. Aspect controls the survival of ice cliffs on debris-covered glaciers[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(17):4369-4374. |
APA | Buri, Pascal,&Pellicciotti, Francesca.(2018).Aspect controls the survival of ice cliffs on debris-covered glaciers.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(17),4369-4374. |
MLA | Buri, Pascal,et al."Aspect controls the survival of ice cliffs on debris-covered glaciers".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.17(2018):4369-4374. |
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