Kanfoush SL, Hodell DA, Charles CD, Guilderson TP, Mortyn PG, Ninnemann US
Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA. Scripps Institution of Oceanography, University of California, San Diego, CA 92093, USA. Lawrence Livermore National Laboratory, Livermore, CA 9.
Science. 2000 Jun 9;288(5472):1815-8. doi: 10.1126/science.288.5472.1815.
Records of ice-rafted detritus (IRD) concentration in deep-sea cores from the southeast Atlantic Ocean reveal millennial-scale pulses of IRD delivery between 20,000 and 74,000 years ago. Prominent IRD layers correlate across the Polar Frontal Zone, suggesting episodes of Antarctic Ice Sheet instability. Carbon isotopes (delta(13)C) of benthic foraminifers, a proxy of deepwater circulation, reveal that South Atlantic IRD events coincided with strong increases in North Atlantic Deep Water (NADW) production and inferred warming (interstadials) in the high-latitude North Atlantic. Sea level rise or increased NADW production associated with strong interstadials may have resulted in destabilization of grounded ice shelves and possible surging in the Weddell Sea region of West Antarctica.
来自东南大西洋深海岩芯的冰筏碎屑（IRD）浓度记录显示，在2万至7.4万年前存在千年尺度的IRD输送脉冲。显著的IRD层在极地锋区具有相关性，这表明南极冰盖存在不稳定时期。底栖有孔虫的碳同位素（δ¹³C）是深水环流的一个指标，它表明南大西洋IRD事件与北大西洋深层水（NADW）产量的强劲增加以及高纬度北大西洋推断的变暖（间冰期）同时发生。与强烈间冰期相关的海平面上升或NADW产量增加，可能导致了南极西部威德尔海地区的陆基冰架不稳定以及可能的冰涌。
