Subglacial floods beneath ice sheets
Subglacial floods beneath ice sheets
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冰盖下的冰下洪水
DOI：
10.1098/rsta.2006.1798
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
N. Hulton
中科院分区：
文献类型：
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作者：
G. Evatt;A. Fowler;C. Clark;N. Hulton
冰下洪水（jökulhlaups）是有据可查的，发生在现今的冰川和冰盖之下。此外，已知在最后一个冰河时代，劳伦泰德冰盖附近的冰坝湖发生了大规模洪水，并且有人认为，在约8000年前，至少有一次这样的洪水在逐渐减弱的冰盖下造成了戏剧性的冷却事件。我们认为，从冰盖下的湖泊排水通常会发生在一个时间周期的方式，这样的洪水可以严重的规模。这种水力喷发在过去很可能造成严重的气候扰动，将来也很可能如此。
Subglacial floods (jökulhlaups) are well documented as occurring beneath present day glaciers and ice caps. In addition, it is known that massive floods have occurred from ice-dammed lakes proximal to the Laurentide ice sheet during the last ice age, and it has been suggested that at least one such flood below the waning ice sheet was responsible for a dramatic cooling event some 8000 years ago. We propose that drainage of lakes from beneath ice sheets will generally occur in a time-periodic fashion, and that such floods can be of severe magnitude. Such hydraulic eruptions are likely to have caused severe climatic disturbances in the past, and may well do so in the future.