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Comparison of Late Neogene U^k′^~37~ and TEX~86~ Paleotemperature Records From the Eastern Equatorial Pacific at Orbital Resolution by K. T. Lawrence; A. Pearson; I. S. Castañeda; C. Ladlow; L. C. Peterson; C. E. Lawrence is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract 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 TEX~86~ 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 TEX~86~ relative to U^k′^~

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Author

K. T. Lawrence; A. Pearson; I. S. Castañeda; C. Ladlow; L. C. Peterson; C. E. Lawrence

Publisher

American Geophysical Union; John Wiley and Sons Inc.; American Geophysical Union (AGU); Wiley; Research Square (ISSN 2572-4517)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)