Antarctic subglacial hydrology: current knowledge and future challenges
Antarctic subglacial hydrology: current knowledge and future challenges
复制标题
南极冰下水文学：当前知识和未来挑战
作者：
D. Ashmore;R. Bingham
摘要东南极洲维多利亚地冰消地貌上的洪水雕刻地貌为南极冰盖下冰下排水网络的存在提供了令人信服的地貌学证据，并激发了对当代冰盖下难以进入的环境的研究。通过这项研究，我们对南极冰下水文的了解正在稳步建立，本文概述了目前的知识状况。冰下水文行为的概念是在温带和北极冰川发展起来的，因此在南极还不太成熟。地球物理和遥感观测表明，许多冰下湖泊是南极冰盖下高度动态的冰下水系网络的一部分。最近对冰下水流的研究，而不是直接与湖泊有关的研究，发现了对冰流动力学、冰盖质量平衡和海洋供水的潜在重大影响，这些影响可能影响循环和营养生产力。尽管在理解方面取得了相当大的进展，但为了提高我们对这些冰下水文过程的认识，仍然存在一些必须克服的重大挑战。
Abstract Flood-carved landforms across the deglaciated terrain of Victoria Land, East Antarctica, provide convincing geomorphological evidence for the existence of subglacial drainage networks beneath the Antarctic ice sheet, and motivate research into the inaccessible environment beneath the contemporary ice sheet. Through this research, our understanding of Antarctic subglacial hydrology is steadily building, and this paper presents an overview of the current state of knowledge. The conceptualization of subglacial hydrological behaviour was developed at temperate and Arctic glaciers, and is thus less mature in the Antarctic. Geophysical and remote sensing observations have demonstrated that many subglacial lakes form part of a highly dynamic network of subglacial drainage beneath the Antarctic ice sheet. Recent research into subglacial water flows, other than those directly concerned with lakes, has discovered potentially significant impacts on ice stream dynamics, ice sheet mass balance, and supplies of water to the ocean potentially affecting circulation and nutrient productivity. Despite considerable advances in understanding there remain a number of grand challenges that must be overcome in order to improve our knowledge of these subglacial hydrological processes.
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