ICEBERG DISCHARGES INTO THE NORTH-ATLANTIC ON MILLENNIAL TIME SCALES DURING THE LAST GLACIATION
ICEBERG DISCHARGES INTO THE NORTH-ATLANTIC ON MILLENNIAL TIME SCALES DURING THE LAST GLACIATION
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DOI：
10.1126/science.267.5200.1005
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发表时间：
1995-02-17
期刊：
影响因子：
56.9
通讯作者：
LOTTI, R
中科院分区：
文献类型：
--
作者：
BOND, GC;LOTTI, R
对北大西洋深海岩芯的高分辨率研究表明，冰山崩解的显著增加每隔2000至3000年出现一次，比与海因里希事件有关的7 000至10 000年的大规模冰排放速度要频繁得多。雕刻周期与格陵兰冰芯中的冷暖振荡有关，称为Dansgaard-Oeschger事件。每一个循环都记录了来自不同来源的冰的同步排放，并且这些循环与海面温度无关。这些发现指出了一种在大气中运行的机制，这种机制导致格陵兰上空气温的快速振荡和来自多个冰盖的崩解。
High-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000- to 10,000-year pacing of massive ice discharges associated with Heinrich events. The carving cycles correlate with warm-cold oscillations, called Dansgaard-Oeschger events, in Greenland ice cores. Each cycle records synchronous discharges of ice from different sources, and the cycles are decoupled from sea-surface temperatures. These findings point to a mechanism operating within the atmosphere that caused rapid oscillations in air temperatures above Greenland and in calving from more than one ice sheet.