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5万年前,智利中度地区的气候变化从树木环中重建出来

F A Roig¹, C Le-Quesne, J A Boninsegna

¹Laboratorio de Dendrocronología, IANIGLA-CONICET, CC 330 (5500) Mendoza, Argentina. froig@lab.cricyt.edu.ar

|March 30, 2001

概括

这项研究提供了Fitzroya cupressoides茎的1,229年树环时间表,将气候记录延伸到5万年前. 这些古老的气候数据揭示了冰川间期的过去气候变化和强迫因素.

科学领域:

古气候学古气候学
登德罗年代学登德罗年代学
气候科学气候科学

背景情况:

高分辨率的气候代理对于了解过去的气候动态至关重要.
树木环 (树木年代学) 对于重建全新纪气候是有价值的,但较旧的记录很少见.
长寿的南美针叶树Fitzroya cupressoides记录了夏季的气温.

研究的目的:

开发一个超越全新纪的高分辨率气候时间表.
分析大约5万年前冰川间阶段时期的气候变化.
为了比较过去的气候强迫因素与当前的间冰期条件.

主要方法:

从南智利的亚化石Fitzroya cupressoides茎构建了一个1,229年的浮式年代表.
放射性碳测年法 (14C) 确定时间表的年龄在现在之前的5万年.
对树环数据的光谱分析,以确定气候变化周期.

主要成果:

建立了一个连续的1,229年的时间表,可以追溯到大约50,000年14C年.
在多个周期 (例如150-250,87-94,24.1,9.3年) 确定了显著的气候变化振荡.
古代记录的光谱特征与现代树环时间表有很大的相似之处.

结论:

菲茨罗亚铜化物为重建过去几万年的气候变化提供了有价值的代理.
类似的强迫生长因素可能影响了Fitzroya cupressoides在这个冰川间阶段期间和当前冰川间阶段期间.
这项研究将高分辨率的气候重建延伸到早期的地质时期,增强我们对长期气候动态的理解.

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