Key features of late Neogene climate remain uncertain due to conflicting records derived from different sea surface temperature (SST) proxies. To understand scenarios in which proxy‐derived temperature estimates can be used interchangeably or are instead measuring different aspects of the same system, it is necessary to explore both the consistencies and differences between specific paleothermometers. Here, we report orbital‐scale climate records from ODP Site 846 in the eastern equatorial Pacific (EEP) for the interval from ~5–6 Ma using alkenone and archaeal lipid paleothermometers. Results from both proxies are similar in their secular trends and magnitude of long‐term temperature change, and spectral analysis demonstrates that the records are coherent and in‐phase in both the obliquity and precession bands. However, we find that the temperatures reconstructed by TEX₈₆ are consistently offset toward colder values by ~2 °C relative to U^k′₃₇‐derived temperatures in global calibrations, or by ~0.8 °C in Bayesian‐based calibrations. All combinations of calibrations also yield approximately twice the amplitude of orbital‐scale variation in TEX₈₆ relative to U^k′₃₇‐derived temperature fluctuations. Both temperature proxies are negatively correlated with sedimentary alkenone concentrations, which we use as an indicator of increased export productivity. Removing this productivity contribution from TEX₈₆ results in an adjusted TEX₈₆ record with temperature sensitivity identical to U^k′₃₇. In future applications, this signal may be decoupled using additional sedimentary indicators of paleoproductivity, which likely will be most important for upwelling zone environments. There remain other nonexplained factors that contribute to differences between TEX₈₆ and U^k′₃₇ that warrant additional investigation.

中文翻译：

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赤道东太平洋轨道分辨率下晚新近纪Uk′37和TEX86古温度记录的比较

由于来自不同海表温度（SST）代理的记录相互矛盾，因此新近纪晚期气候的关键特征仍然不确定。要了解可以互换使用代理得出的温度估算值或替代方法来测量同一系统的不同方面的情况，有必要探索特定古温度计之间的一致性和差异性。在这里，我们报告了使用烯酮和古脂类脂质古温度计在赤道东太平洋（EEP）的ODP 846站的〜5-6 Ma间隔内的轨道规模气候记录。两种代理的长期趋势和长期温度变化的幅度都相似，光谱分析表明，在倾斜带和进动带中，记录是连贯且同相的。然而，₈₆一致地朝向较冷值偏移〜2℃相对至U ^K' _37个衍生的温度在全球校准，或由〜0.8℃下，在基于贝叶斯校准。校准的所有组合也产生大约轨道尺度变化的幅度两倍TEX ₈₆相至U ^K' _37间衍生的温度波动。两种温度指标与沉积烯酮浓度呈负相关，我们将其用作提高出口生产率的指标。从TEX删除此生产率贡献_86所导致一个调节TEX ₈₆记录与温度敏感性相同至U ^K' ₃₇。在未来的应用中，可以使用额外的古生产力沉积指标来解耦该信号，这对于上升流带环境可能是最重要的。仍然存在有助于TEX之间的差异等因素nonexplained ₈₆和U ^K' ₃₇即保证额外的调查。