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经过80万年的突然气候变化,气候变化很大
Stephen Barker1, Gregor Knorr, R Lawrence Edwards
1School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT, UK. barkers3@cf.ac.uk
Science (New York, N.Y.)
|September 10, 2011
概括
研究人员创建了格陵兰的80万年气候记录,揭示了双极摇摆振荡和冰川终结之间的强烈联系. 这为过去的气候变化事件提供了关键的时间表.
科学领域:
- 古气候学 古气候学
- 气候建模气候模型
- 四年纪地质学四年纪地质学
背景情况:
- 了解长期气候变化对于预测未来气候变化至关重要.
- 千年级的气候振荡,就像双极波动一样,显著影响全球气候动态.
- 准确的古气候记录日期对于建立气候事件之间的时间关系至关重要.
研究的目的:
- 使用热双极摇摆模型,为格陵兰建立一个合成的80万年气候变化记录.
- 为了验证合成记录与现有的格陵兰冰芯和中国洞穴记录相比.
- 评估千年规模变化的长期演变及其在过去气候变化,特别是冰川终结中的作用.
主要方法:
- 基于热双极摇摆模型开发格陵兰的80万年合成气候记录.
- 合成记录与格陵兰冰核 (过去10万年) 的古气候数据进行比较和验证.
- 合成记录与来自中国 (过去40万年) 的绝对日期的洞穴记录的相关性.
主要成果:
- 格陵兰的合成气候记录成功地重现了冰芯数据中观察到的关键变化模式.
- 在合成记录和中国洞穴记录之间发现了强烈的相似性,使得过去40万年的绝对约会成为可能.
- 证据表明,双极摇摆振荡和冰川终结在中后期普莱斯托纪期间之间存在着一致的关联.
结论:
- 该研究提供了一个强大的分层地理参考和概念框架,用于理解长期气候变化.
- 这些发现凸显了双极波动动力学在推动主要气候变化的重要作用,包括冰川的终结.
- 这项研究提高了我们解释古气候记录和评估过去气候变化的机制的能力.
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