Geomorphological criteria for identifying Pleistocene ice streams
Geomorphological criteria for identifying Pleistocene ice streams
复制标题
识别更新世冰流的地貌标准
DOI：
10.3189/172756499781821625
复制
发表时间：
1999
影响因子：
2.9
通讯作者：
C. Clark
中科院分区：
文献类型：
--
作者：
C. Stokes;C. Clark
摘要 冰流是当代冰盖的关键调节机制。据推测，它们也对前冰盖的动力学产生了重大影响。随后，许多人引用了它们在各种以前的冰川地区的广泛存在。然而，假设的地点往往比有意义的证据更重要。本文解决了这个问题，利用当代冰流的特征作为从以前的冰盖床中识别冰流的基础。从当代冰流研究中获得的知识的融合，再加上冰川地貌学理论，使得一些地貌标准能够被识别为冰流活动的暗示性特征。预计这里制定的地貌标准将为研究前冰流引入更客观的方法。该标准用于构建前冰流床的概念陆地系统模型，希望这些模型能够提供一个观测模板，以便更好地基于前冰流的假设。
Abstract Ice streams are critical regulatory mechanisms in contemporary ice sheets. It has been inferred that they also had a significant effect on the dynamics of former ice sheets. Subsequently, many people have invoked their widespread occurrence from a variety of formerly glaciated areas. Hypothesised locations, however, have often outweighed meaningful evidence. This paper addresses the problem, using the characteristics of contemporary ice streams as a basis for their identification from former ice-sheet beds. A convergence of knowledge gained from contemporary ice-stream research, coupled with theories of glacial geomorphology, allows several geomorphological criteria to be identified as suggestive signatures of ice-stream activity. It is envisaged that the geomorphological criteria developed here will introduce a more objective approach to the study of former ice streams. The criteria are used to construct conceptual land-system models of the beds of former ice streams, and it is hoped such models can provide an observational template upon which hypotheses of former ice streams can be better based.