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Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI-OH Index

机译：基于新的Ri-OH指数，在最后的冰川周期中苍白热度测量

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摘要

RI-OH (ring index of hydroxylated tetraethers) has recently been proposed to reconstruct paleotemperatures in middle-to low-latitude marginal seas. However, RI-OH has barely been tested in marginal seas under substantial terrigenous inputs. Here we analyze tetraether lipids in two adjacent marine cores from the Gulf of Lions. We then test for the first time the RI-OH paleothermometer from 160 to 9 ka BP in the western Mediterranean Sea. While terrigenous inputs prevent TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms) from behaving as a paleothermometer, RI-OH is generally consistent with other paleothermometric proxies. RI-OH also responds systematically and coherently to glacial-interglacial transitions as well as to abrupt climatic events. The average difference between RI-OH temperatures and November-May U~K′_(37) (C37 ketone unsaturation ratio) temperatures is-2.0 °C with a standard error of 0.4 °C based on 249 RI-OH-U~K′_(37) comparisons. This systematic difference suggests that hydroxylated tetraethers and alkenones record different temperatures, for instance, winter and/or subsurface temperatures for RI-OH. Another source of bias could be linked to the available RI-OH-temperature calibration, which clearly needs more work at the global and regional scales, notably for semienclosed basins such as the Mediterranean Sea. Nevertheless, our RI-OH-based interglacial-glacial anomalies are of 10 °C, a value within the high end of anomalies from previously published temperature records in the western Mediterranean Sea (from 3 to 13 °C). The RI-OH-based temperature anomalies also confirm the regional differences and seasonal contrasts in interglacial-glacial anomalies produced by models.
机译：最近提出了RI-OH（羟基化四醚的环指数），以重建中间对低纬度边缘海洋的古金葡萄球菌。然而，RI-OH在实质性的堆积投入下几乎没有在边缘海洋中进行过测试。在这里，我们分析了来自狮子湾的两个相邻海洋核心的四氧化物脂质。然后，我们首次测试Ri-OH苍白计从160到9 KA BP在西部地中海。虽然人造的输入防止Tex86（由86个碳原子组成的四醚的四醚指数）从表现为苍白计，Ri-OH通常与其他苍间计量的代理一致。 RI-OH也系统地，干燥地应对冰川间过渡以及突然的气候事件。 RI-OH温度和11月 - 可以U〜K'_（37）（C37酮不饱和度比）温度为-2.0°C的平均差异为-2.0°C，标准误差为0.4°C，基于249 RI-OH-U〜K. '_（37）比较。这种系统的差异表明羟基化的四醚和链烯酮记录了例如Ri-OH的冬季和/或地下温度的不同温度。另一个偏差来源可以与可用的Ri-OH温度校准相关联，这显然需要在全球和区域鳞片上的更多工作，特别是用于半闭合的盆地，如地中海。尽管如此，我们的Ri-OH基层冰川异常为10°C，来自西部地中海（3至13°C）的先前公布的温度记录的异常高端内的值。 Ri-OH的温度异常还确认了模型生产的中间冰川异常中的区域差异和季节性对比。

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  • 来源
    《Paleoceanography》 |2019年第4期|共19页
  • 作者

    Nina Davtian; Guillemette Ménot; Yoann Fagault; Edouard Bard;

  • 作者单位

    CEREGE Aix-Marseille University CNRS IRD INRA Collège de France Technop?le de l'Arbois Aix-en-Provence France;

    Univ Lyon ENS de Lyon Université Lyon 1 CNRS UMR 5276 LGL-TPE Lyon France;

    CEREGE Aix-Marseille University CNRS IRD INRA Collège de France Technop?le de l'Arbois Aix-en-Provence France;

    CEREGE Aix-Marseille University CNRS IRD INRA Collège de France Technop?le de l'Arbois Aix-en-Provence France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    Western Mediterranean; Sea Paleothermometry; Over the;

    机译：西部地中海;海苍白温度测定;在;

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