Preprints
https://doi.org/10.5194/cp-2019-133
https://doi.org/10.5194/cp-2019-133

  21 Feb 2020

21 Feb 2020

Review status: a revised version of this preprint is currently under review for the journal CP.

A Revised Mid-Pliocene Composite Section for ODP Site 846

Timothy D. Herbert1, Rocio Caballero-Gill1,2, and Joseph B. Novak1 Timothy D. Herbert et al.
  • 1Department of Earth, Environmental and Planetary Sciences, Box 1846, Brown University, Providence RI 02906 USA
  • 2Atmospheric, Oceanic, and Earth Sciences, George Mason University, University Dr., Fairfax VA 22030 USA

Abstract. The composite section from ODP Site 846 has provided key data sets for Pliocene stable isotope and paleoclimatic time series. We document here errors in primary data sets for stable isotopes and alkenone-derived sea surface temperature estimates (SST) in the late Pliocene interval containing the M2 glaciation (ca. 3.250–3.3 Ma) by tying high resolution core measurements to a continuous downhole conductivity log. In addition, we provide new stable isotopic and alkenone measurements that correlate well to the revised splices of color reflectance and gamma ray attenuation porosity evaluator data. A new composite splice is proposed, along with composite isotope and alkenone time series that should be integrated into revised Pliocene paleoclimatic stacks.

Timothy D. Herbert et al.

 
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Status: final response (author comments only)
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Timothy D. Herbert et al.

Timothy D. Herbert et al.

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Short summary
The Pliocene represents a geologically warm period with polar ice restricted to the Antarctic. Nevertheless, variability and ice volume persisted in the Pliocene. This work revisits a classic site on which much of our understanding of Pliocene paleoclimate variability is based and corrects errors in data sets related to ice volume and ocean surface temperature. In particular, it generates an improved representation of an enigmatic glacial episode in late Pliocene time (circa 3.3 Myr).