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首页> 外文期刊>Paleoceanography >Diachronous benthic ε~18O responses during late Pleistoceneterminations
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Diachronous benthic ε~18O responses during late Pleistoceneterminations

机译：晚更新世末期的底栖ε〜18O响应

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[1] Benthic ε~18Ois often used as a stratigraphic tool to place marine records on a common age model and as aproxy for the timing of ice volume/sea level change. However, Skinner and Shackleton (2005) found that thetiming of benthic ε~18O change at the last termination differed by 3900 years between one Atlantic site and onePacific site. These results suggest that benthic 6180 change may not always accurately record the timing ofdeglaciation. We compare benthic 6180 records from 20 Atlantic sites and 14 Pacific sites to evaluate systematicdifferences in the timing of terminations in benthic 6180. Analysis of sedimentation rates derived from thealignment of benthic ε~18Osuggests a statistically significant Atlantic lead over Pacific benthic 6180 changeduring the last six terminations. We estimate an average Pacific benthic 6180 lag of 1600 years for Terminations1-5, slightly larger than the delay expected from ocean mixing rates given that most glacial meltwater probablyenters the North Atlantic. We additionally find evidence of —4000-year Pacific 6'0 lags at approximately128 ka and 330 ka, suggesting that stratigraphic correlation of 6180 has the potential to generate age modelerrors of several thousand years during terminations. A simple model demonstrates that these lags can begenerated by diachronous temperature changes and do not require slower circulation rates. Most importantly,diachronous benthic 6180 responses must be taken into account when comparing Atlantic and Pacific benthic6180 records or when using benthic 6180 records as a proxy for the timing of ice volume change.
机译：[1] Benthicε〜18O通常用作地层学工具，以将海洋记录放置在共同的年龄模型上，并用作冰量/海平面变化时间的替代。然而，斯金纳和沙克尔顿（Skinner and Shackleton，2005）发现，在一个大西洋站点和一个太平洋站点之间，底栖的ε〜18O变化的最后时刻相差3900年。这些结果表明底栖6180变化可能并不总是准确地记录下冰期的时间。我们比较了来自20个大西洋站点和14个太平洋站点的底栖6180记录，以评估底栖6180终止时机的系统差异。分析底栖ε〜18的对准所产生的沉积速率表明，在太平洋底栖6180上大西洋沿岸铅具有统计学意义，从而改变了最后六个终止。我们估计，Terminations1-5的太平洋底栖海平面6180平均滞后时间为1600年，比大多数海冰融水可能进入北大西洋的海洋混合速度所造成的延迟稍大。我们还发现证据表明-4000年太平洋6'0时差大约在128 ka和330 ka处，这表明6180的地层相关性有可能在终止时产生数千年的年龄模型误差。一个简单的模型表明，这些滞后可以由温度的历时变化产生，不需要较慢的循环速度。最重要的是，在比较大西洋和太平洋底栖6180记录或使用底栖6180记录作为冰量变化时间的代理时，必须考虑历时底栖6180的响应。

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