Ice Core Evidence for Extensive Melting of the Greenland Ice Sheet in the Last Interglacial
Ice Core Evidence for Extensive Melting of the Greenland Ice Sheet in the Last Interglacial
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末次间冰期格陵兰冰盖大规模融化的冰芯证据
DOI：
10.1126/science.244.4907.964
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发表时间：
1989
期刊：
影响因子：
56.9
通讯作者：
R. Koerner
中科院分区：
文献类型：
--
作者：
R. Koerner
来自加拿大北极群岛和格陵兰世纪营和Dye-3冰芯底部的冰证据表明，格陵兰冰盖在超过100ka(千年前)的最后一次间冰期广泛或完全融化，这与早期的解释相反。此前，基冰中存在的泥土颗粒被认为表明冰盖底部已经融化，这些冰块最初生长的时间的证据已经被摧毁。然而，当冰盖和冰盖的尺寸小得多时，这些颗粒很可能会被吹到冰上。冰的结构、气体含量和其他证据也表明，每个钻探地点的基冰都是叠加冰，这是一种典型的冰帽或冰盖早期生长阶段的冰。如果今天的冰块在最后一次间冰期开始增长，那么早期(伊利诺斯)冰期的冰盖一定已经在同一间冰期的早期部分完全或大部分融化了。如果确实发生了这样的融化，桑加蒙期间比现在高出6米的海平面不能像人们所说的那样归因于西南极冰盖的解体。
Evidence from ice at the bottom of ice cores from the Canadian Arctic Islands and Camp Century and Dye-3 in Greenland suggests that the Greenland ice sheet melted extensively or completely during the last interglacial period more than 100 ka (thousand years ago), in contrast to earlier interpretations. The presence of dirt particles in the basal ice has previously been thought to indicate that the base of the ice sheets had melted and that the evidence for the time of original growth of these ice masses had been destroyed. However, the particles most likely blew onto the ice when the dimensions of the ice caps and ice sheets were much smaller. Ice texture, gas content, and other evidence also suggest that the basal ice at each drill site is superimposed ice, a type of ice typical of the early growth stages of an ice cap or ice sheet. If the present-day ice masses began their growth during the last interglacial, the ice sheet from the earlier (Illinoian) glacial period must have competely or largely melted during the early part of the same interglacial period. If such melting did occur, the 6-meter higher-than-present sea level during the Sangamon cannot be attributed to disintegration of the West Antarctic ice sheet, as has been suggested.