Delayed sedimentary response to abrupt climate change at the Paleocene-Eocene boundary, northern Spain
Delayed sedimentary response to abrupt climate change at the Paleocene-Eocene boundary, northern Spain
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DOI：
10.1130/g45631.1
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发表时间：
2019-02-01
期刊：
影响因子：
5.8
通讯作者：
Jones, Tom Dunkley
中科院分区：
文献类型：
--
作者：
Duller, Robert A.;Armitage, John J.;Jones, Tom Dunkley
沉积物路由系统（SRS）是全球应对持续气候变化的关键要素。然而，SRS对气候强迫的响应是复杂的，不完整的，并且当在短的人类时间尺度（10（-1）-10（2）年）上观察时是模糊的。在长时间尺度上（>10（2）-10（3）年），从沉积记录中可以更有把握地收集到SRS对气候强迫的综合、系统范围的响应，但对这种对气候突变的综合响应的性质和时间尺度仍然知之甚少。在这里，我们调查汇总的时间响应的SRS在西班牙北方的古新世-始新世热最高峰（PETM）突然气候变暖。我们的研究结果表明，西班牙北方的陆地站点记录了16.5 +/- 7.5 k. y的时间滞后。在PETM的开始，定义为在三角洲C-13配置文件中的突然负偏移，和粗粒沉积的开始之间。在西部500公里的深海站点的同一SRS内，我们观察到16.5 +/- 1.5 k. y的时间滞后。使用独立于用于陆地站点的年龄模型。这些结果表明，综合的，系统范围内的响应SRS对当今的全球变暖，如果我们把PETM作为一个适当的现代类比，可能会持续数千年的未来。
Sediment routing systems (SRSs) are a critical element of the global response to ongoing climate change. However SRS response to climate forcing is complex, fragmentary, and obscured when viewed over short, human time scales (10(-1)-10(2) yr). Over long time scales (>10(2)-10(3) yr), the aggregated, system-wide response of SRSs to climate forcing can be gleaned with more confidence from the sedimentary record, but the nature and time scales of this aggregated response to abrupt climate change are still poorly understood. Here, we investigate the aggregated temporal response of a SRS in northern Spain to abrupt climate warming at the Paleocene-Eocene thermal maximum (PETM). Our results show that terrestrial sites in northern Spain record a temporal lag of 16.5 +/- 7.5 k.y. between the onset of the PETM, defined by an abrupt negative excursion in the delta C-13 profile, and the onset of coarse-grained deposition. Within the same SRS at a deep marine site 500 km to the west, we observe a temporal lag of 16.5 +/- 1.5 k.y. using an age model that is independent of that used for the terrestrial sites. These results suggest that the aggregated, system-wide response of SRSs to present-day global warming-if we take the PETM as an appropriate modern-day analogue-may persist for many millennia into the future.