Linear-viscous flow of temperate ice

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-01-09 DOI:10.1126/science.adp7708

Collin M. Schohn, Neal R. Iverson, Lucas K. Zoet, Jacob R. Fowler, Natasha Morgan-Witts

引用次数: 0

Abstract

Accurately modeling the deformation of temperate glacier ice, which is at its pressure-melting temperature and contains liquid water at grain boundaries, is essential for predicting ice sheet discharge to the ocean and associated sea-level rise. Central to such modeling is Glen’s flow law, in which strain rate depends on stress raised to a power of n = 3 to 4. In sharp contrast to this nonlinearity, we found by conducting large-scale, shear-deformation experiments that temperate ice is linear-viscous (n ≈ 1.0) over common ranges of liquid water content and stress expected near glacier beds and in ice-stream margins. This linearity is likely caused by diffusive pressure melting and refreezing at grain boundaries and could help to stabilize modeled responses of ice sheets to shrinkage-induced stress increases.

查看原文本刊更多论文

温带冰的线性粘性流动

温带冰川冰处于压力融化温度，在晶界处含有液态水，对其变形进行精确建模，对于预测冰盖向海洋的排放以及与之相关的海平面上升至关重要。这种模型的核心是格伦流动定律，其中应变率取决于应力的n = 3到4次方。与这种非线性形成鲜明对比的是，我们通过进行大规模剪切变形实验发现，在冰川床和冰流边缘附近的液态水含量和应力的一般范围内，温带冰是线性粘性的（n≈1.0）。这种线性可能是由扩散压力在晶界融化和再冻结引起的，可以帮助稳定模拟的冰盖对收缩引起的应力增加的响应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

期刊介绍： Science is a leading outlet for scientific news, commentary, and cutting-edge research. Through its print and online incarnations, Science reaches an estimated worldwide readership of more than one million. Science’s authorship is global too, and its articles consistently rank among the world's most cited research. Science serves as a forum for discussion of important issues related to the advancement of science by publishing material on which a consensus has been reached as well as including the presentation of minority or conflicting points of view. Accordingly, all articles published in Science—including editorials, news and comment, and book reviews—are signed and reflect the individual views of the authors and not official points of view adopted by AAAS or the institutions with which the authors are affiliated. Science seeks to publish those papers that are most influential in their fields or across fields and that will significantly advance scientific understanding. Selected papers should present novel and broadly important data, syntheses, or concepts. They should merit recognition by the wider scientific community and general public provided by publication in Science, beyond that provided by specialty journals. Science welcomes submissions from all fields of science and from any source. The editors are committed to the prompt evaluation and publication of submitted papers while upholding high standards that support reproducibility of published research. Science is published weekly; selected papers are published online ahead of print.