Theoretical framework and diagnostic criteria for the identification of palaeo-subglacial lakes
Theoretical framework and diagnostic criteria for the identification of palaeo-subglacial lakes
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古冰下湖泊识别的理论框架和诊断标准
DOI：
10.1016/j.quascirev.2012.08.010
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发表时间：
2012
影响因子：
4
通讯作者：
Livingstone S
中科院分区：
文献类型：
--
作者：
Livingstone S
南极冰盖下面有许多冰下湖泊，这些湖泊是其水文网络的重要和活跃的组成部分。这些湖泊分布广泛，在各种条件下以各种规模出现。目前，许多冰川学研究关注的是现代冰下湖泊系统在南极洲的作用。另一种探索冰下湖泊的方法是识别曾经存在于前冰盖下的冰下湖泊的地质记录。这是具有挑战性的，无论是在概念上，在确定是否和冰下湖泊可能已经形成，也区分以前的冰下湖泊在地质记录的签名。在这项工作中，我们提供了一个综合的冰下湖泊类型，已确定或可能存在于当代或古冰盖理论。这包括讨论可能引发冰下湖泊形成（或流失）的形成机制。这些概念为讨论冰下湖泊存在（艾德）于其他（古）冰盖之下的可能性提供了一个框架。事实上，我们的结论是，前中纬度冰盖很可能举办冰下湖泊，虽然空间分布，频率和类型的湖泊可能与今天的冰盖和古冰盖之间的不同。鉴于这种可能性，我们提出了诊断标准，确定古冰下湖泊的地质记录。这些标准来自当代观测、水文理论和过程模拟，为详细的实地调查提供了观测模板。
The Antarctic Ice Sheet is underlain by numerous subglacial lakes, which comprise a significant and active component of its hydrological network. These lakes are widespread and occur at a range of scales under a variety of conditions. At present much glaciological research is concerned with the role of modern subglacial lake systems in Antarctica. Another approach to the exploration of subglacial lakes involves identification of the geological record of subglacial lakes that once existed beneath former ice sheets. This is challenging, both conceptually, in identifying whether and where subglacial lakes may have formed, and also distinguishing the signature of former subglacial lakes in the geological record. In this work we provide a synthesis of subglacial lake types that have been identified or may theoretically exist beneath contemporary or palaeo-ice sheets. This includes a discussion of the formative mechanisms that could trigger onset of (or drain) subglacial lakes. These concepts provide a framework for discussing the probability that subglacial lakes exist(ed) beneath other (palaeo-)ice sheets. Indeed we conclude that the former mid-latitude ice sheets are likely to have hosted subglacial lakes, although the spatial distribution, frequency and type of lakes may have differed from today's ice sheets and between palaeo-ice sheets. Given this possibility, we propose diagnostic criteria for identifying palaeo-subglacial lakes in the geological record. These criteria are derived from contemporary observations, hydrological theory and process-analogues and provide an observational template for detailed field investigations.
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DOI：
--
发表时间：
2007
期刊：
影响因子：
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