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末次冰期千年时间尺度上冰山向北大西洋的崩解。

Iceberg discharges into the north atlantic on millennial time scales during the last glaciation.

出版信息

Science. 1995 Feb 17;267(5200):1005-10. doi: 10.1126/science.267.5200.1005.

DOI:10.1126/science.267.5200.1005
PMID:17811441
Abstract

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 calving 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.

摘要

对北大西洋深海岩芯的高分辨率研究表明,冰山崩解显著增加的间隔为 2000 到 3000 年,比与 Heinrich 事件相关的大规模冰排放的 7000 到 10000 年的间隔更为频繁。这些崩解周期与格陵兰冰芯中的冷暖交替事件(称为 Dansgaard-Oeschger 事件)相关。每个周期都记录了来自不同来源的冰的同步排放,并且这些周期与海表温度无关。这些发现指向一种在大气中运行的机制,该机制导致格陵兰上空的空气温度和多个冰原的崩解出现快速波动。

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