Rapid coupling between ice volume and polar temperature over the past 150,000 years
Rapid coupling between ice volume and polar temperature over the past 150,000 years
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DOI：
10.1038/nature11593
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发表时间：
2012-11-29
期刊：
影响因子：
64.8
通讯作者：
Roberts, A. P.
中科院分区：
文献类型：
--
作者：
Grant, K. M.;Rohling, E. J.;Roberts, A. P.
当前全球变暖需要详细了解气候和全球冰量之间的关系。高分辨率和连续的海平面记录对于量化冰量变化至关重要。然而，对过去冰量变化相对于极地气候变化的时间进行不偏不倚的研究迄今是不可能的，因为现有的海平面记录要么是通过轨道调谐或冰芯时间尺度测定的，要么是在时间上不连续的。在这里，我们展示了一个连续的，高分辨率的海平面记录(1，2)的独立年代测定，在过去的150,000年中，千年尺度的细节。我们发现，冰量波动的时间与南极气候，特别是格陵兰气候的变化很好地吻合。冰量波动的幅度更符合南极(而不是格陵兰)的气候变化。研究发现，在百年响应时间内，极地气候和冰量的变化及其变化速度是不同的。最后，在冰量减少的所有主要时期，海平面上升的速度至少达到了每世纪1.2米。
Current global warming necessitates a detailed understanding of the relationships between climate and global ice volume. Highly resolved and continuous sea-level records are essential for quantifying ice-volume changes. However, an unbiased study of the timing of past ice-volume changes, relative to polar climate change, has so far been impossible because available sea-level records either were dated by using orbital tuning or ice-core timescales, or were discontinuous in time. Here we present an independent dating of a continuous, high-resolution sea-level record(1,2) in millennial-scale detail throughout the past 150,000 years. We find that the timing of ice-volume fluctuations agrees well with that of variations in Antarctic climate and especially Greenland climate. Amplitudes of ice-volume fluctuations more closely match Antarctic (rather than Greenland) climate changes. Polar climate and ice-volume changes, and their rates of change, are found to covary within centennial response times. Finally, rates of sea-level rise reached at least 1.2 m per century during all major episodes of ice-volume reduction.