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北大西洋气候记录中最后一次脱冰的时间
C Waelbroeck1, J C Duplessy, E Michel
1Laboratoire des Sciences du Climat et de l'Environnement, Domaine du CNRS, bât. 12, 91198 Gif-sur-Yvette, France. Claire.Waelbroeck@lsce.cnrs-gif.fr
Nature
|August 17, 2001
概括
北大西洋海洋沉积物的放射性碳年代测定需要由于表面水的年龄变化而进行校正. 这些水库年龄的变化影响了过去的气候记录在最后一次脱冰期间.
科学领域:
- 古代海洋学 古代海洋学 古代海洋学
- 气候科学 气候科学
- 地质年代学地质年代学.
背景情况:
- 协调大陆和海洋气候记录对于理解脱冰至关重要.
- 海洋沉积物的放射性碳测年依赖于恒定地表水明显年龄 (水库年龄) 的假设.
研究的目的:
- 为了研究北大西洋地表水的变化,在过去的2万年里明显的年龄.
- 为降冰事件提供更准确的时间框架.
主要方法:
- 来自北大西洋 (北40度以北) 的两个沉积物核心的分析.
- 放射性碳测年法用于确定过去的表面水的明显年龄.
主要成果:
- 表面水的明显年龄在海因里希1年和较年轻的德里亚斯事件期间明显高于现在.
- 明显的年龄与博林-阿勒罗德体育场间的当前值相似.
- 确定的变化为1,230 +/- 600到1,940 +/- 750年 (海因里希1) 和820 +/- 430到1,010 +/- 340年 (年轻的干旱).
结论:
- 北大西洋水库年龄不变的假设是无效的,需要对海洋放射性碳年代进行修正.
- 在最后一次脱冰期间,冰芯和海洋记录之间的时间表进行了调和.
- 强调在古海洋学研究中考虑水库年龄变化的重要性.
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