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Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry

机译：环指数：一种评估TEX86古温度计完整性的新策略

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摘要

The TEX86 (tetraether index of 86 carbon atoms) sea surface temperature proxy has been increasingly applied in the reconstruction of Mesozoic and Cenozoic ocean temperatures. However, the archaeal lipids that compose TEX86 indices, glycerol dialkyl glycerol tetraethers (GDGTs), can derive from water column production, terrestrial sources, and/or within sediments. TEX86-sea surface temperature estimates can also be influenced by non-temperature factors, such as growth phase and nutrient levels. Here we show that the weighted average of cyclopentane moieties, known as the Ring Index (RI), can be used to determine if TEX86 temperature estimates are influenced by non-thermal factors and/or deviate from modern analogues. We demonstrate that RI and TEX86 indices from the published global core top data set and mesocosm cultures are significantly correlated, as predicted through the influence of temperature on lipid biochemistry. We further show that when RI and TEX86 indices in modern or ancient records deviate from the modern global TEX86-RI relationship, GDGT distributions are not solely controlled by environmental temperature and/or TEX86-based temperature reconstructions are questionable.
机译：TEX86（86个碳原子的四醚指数）海面温度指标已越来越多地用于中生代和新生代海洋温度的重建。但是，组成TEX86指数的古细菌脂质，甘油二烷基甘油四醚（GDGT），可以源自水柱生产，陆地来源和/或沉积物中。 TEX86海面温度估算值也可能受非温度因素影响，例如生长期和营养水平。在这里，我们表明，环戊烷部分的加权平均值（称为环指数（RI））可用于确定TEX86温度估算值是否受非热因素影响和/或偏离现代类似物。我们证明，如通过温度对脂质生物化学的影响所预测的那样，已发布的全球核心顶级数据集和中胚层培养物之间的RI和TEX86指数显着相关。我们进一步表明，当现代或古代记录中的RI和TEX86指数偏离现代全球TEX86-RI关系时，GDGT分布不仅受环境温度控制，和/或基于TEX86的温度重建值得怀疑。

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