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南极冰盖在最后一次降冰期间的排放的千年级变化
M E Weber1, P U Clark2, G Kuhn3
1Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Strasse 49a, 50935 Cologne, Germany.
Nature
|May 30, 2014
概括
新的高分辨率记录揭示了8次南极冰盖 (AIS) 冰山排放事件在最后一次降冰期间. 最高的流量与融水脉冲1A相吻合,表明南极的重要贡献和反循环放大了冰层融化和海平面上升.
科学领域:
- 古气候学 古气候学
- 冰川学的冰川学
- 海洋学 海洋学 海洋学
背景情况:
- 了解南极冰盖 (AIS) 脱冰是由于稀疏的陆地和海洋记录而受到限制的.
- 现有的记录缺乏分辨率和日期准确性,无法完全重建AIS动态及其与气候和海平面的反.
- 冰山漂浮碎片 (IBRD) 为冰盖变化提供了连续的代理,但南大洋记录很少.
研究的目的:
- 通过使用高分辨率IBRD记录,重建南极冰盖在最后一次脱冰期间的变化.
- 确定冰山排放的关键时期及其对全球海平面变化的贡献.
- 调查南大洋变暖和AIS融化之间的潜在反.
主要方法:
- 分析了来自南大洋的两颗高分辨率,日期精确的海洋沉积物核心.
- 在最后一次除冰期 (20,0009,000年前) 期间,冰山漂浮碎片 (IBRD) 流动的重建.
- 气候模型模拟包括AIS淡水强迫.
主要成果:
- 记录了八个不同的事件,在2万到9000年前,从AIS增加了冰山流量.
- 确定了14600年前IBRD流量最高的IBRD流量,提供了南极对融水脉冲1A.贡献的直接证据.
- 气候模型显示了一个积极的反机制,涉及环极深水变暖和AIS融化.
结论:
- 在最后一次降冰期间,AIS经历了显著的,偶尔的退缩,挑战了以前逐渐下降的模型.
- 南极融水对融水脉冲1A产生了重大影响,影响了全球海平面.
- 一个积极的反循环放大了AIS融化,可能解释了海平面迅速上升的事件.
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