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A LARGE DEEP FRESHWATER LAKE BENEATH THE ICE OF CENTRAL EAST ANTARCTICA

机译:南极中部冰河下的一个大深海淡水湖

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摘要

IN 1974-75, an airborne radio-echo survey of ice depths over central East Antarctica led to the discovery of a sub-ice lake of unknown depth and composition, with an area of about 10,000 km(2) and lying beneath similar to 4 km of ice(1). In 1993, altimetric data from satellite measurements(2) provided independent evidence of the lake's areal extent, thus confirming it to be the largest known sub-ice lake by an order of magnitude, Here we analyse nem altimetric and radio-echo data, along with existing seismic data(3), to show that the lake is deep (mean depth of 125 m or more) and fresh, and that it has an area that exceeds previous estimates by about 50%-dimensions comparable with those of Lake Ontario. We estimate that the residence time of the crater in the lake is of the order of tens of thousands of Sears, and that the mean age of water in the lake, since deposition as surface ice, is about one million years, Regional ice-dynamics can be explained in terms of steady-state ice flow along and over tile lake. [References: 20]
机译:在1974-75年间,对南极东部中部的冰深进行了机载无线电回波调查,结果发现了一个未知深度和成分的子冰湖,其面积约为10,000 km(2),并且位于下方,类似于4公里的冰(1)。 1993年,来自卫星测量的高空数据(2)提供了该湖面积的独立证据,从而确定了该湖是已知最大的子冰湖一个数量级。在这里,我们分析了Nem高空和无线电回波数据,以及根据现有的地震数据(3),表明该湖很深(平均深度为125 m或更大)且很新鲜,其面积比以前的估计超出了安大略湖约50%的尺寸。我们估计火山口在湖中的停留时间约为数万西尔斯,并且由于沉积为地表冰,湖中水的平均年龄约为一百万年。可以用沿瓦湖上下流动的稳态冰流来解释。 [参考:20]

著录项

  • 来源
    《Nature》 |1996年第6584期|p. 684-686|共3页
  • 作者单位

    UNIV WALES INST EARTH STUDIES CTR GLACIOL ABERYSTWYTH SY23 3DB DYFED WALES;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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