noaa-ocean-25950 Southwest Pacific Stable Isotope, Biomarker and SST Reconstruction Data during the mid-late Pliocene Caballero-Gill, R.P.; Herbert, T.D.; Dowsett, H.J. Southwest Pacific Stable Isotope, Biomarker and SST Reconstruction Data during the mid-late Pliocene 2019-01-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25950 Investigator R.P. Caballero-Gill Investigator T.D. Herbert Investigator H.J. Dowsett earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean physical properties earth science paleoclimate paleocean reconstruction earth science paleoclimate paleocean magnetic susceptibility geoscientificInformation 5461187 cal yr BP 2242024 cal yr BP Complete -45.52 -42.55 -178.166 -174.95 -1370 -1204 Ocean Pacific Ocean South Pacific Ocean ODP 1125>LATITUDE -42.55>LONGITUDE -178.166 Ocean Pacific Ocean South Pacific Ocean DSDP 594>LATITUDE -45.52>LONGITUDE -174.95 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Caballero-Gill, R.P. et al. 2019 Paleoceanography and Paleoclimatology submitted Herbert, T.D., K.T. Lawrence, A. Tzanova, L.C. Peterson, R. Caballero-Gill, and C.S. Kelly 2016 Nature Geoscience 9 843-847 10.1038/ngeo2813

During the late Miocene epoch, about seven million years ago, large areas of the continents experienced drying, enhanced seasonality, and a restructuring of terrestrial plant and animal communities. These changes are seen throughout the subtropics, but have typically been attributed to regional tectonic forcing. Here we present a set of globally distributed sea surface temperature records spanning the past 12 million years based on the alkenone unsaturation method. We find that a sustained late Miocene cooling occurred synchronously in both hemispheres, and culminated with ocean temperatures dipping to near-modern values between about 7 and 5.4 million years ago. The period of maximum cooling coincides with evidence for transient glaciations in the Northern Hemisphere and with a steepening of the pole-to-equator temperature gradient, as well. We thus infer that late Miocene aridity and terrestrial ecosystem changes occurred in a global context of increasing meridional temperature gradients. We conclude that a global forcing mechanism, such as the previously hypothesized decline in atmospheric CO2 levels between eight and six million years ago, is required to explain the late Miocene changes in temperature, climate and ecosystems. STUDY NOTES: Age models, stable isotopes are from benthic foraminifera and biomarkers are: Uk'37 sst and C37total Provided Keywords: mid-late Pliocene; Southwest Pacific; benthic foraminifera stable isotopes; Uk'37 sst and C37total; DSDP 594; ODP 1125

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-odp1125-species.txt NOAA Template File; ODP 1125 Species d18O and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-odp1125-ms.txt NOAA Template File; ODP 1125 Magnetic Susceptibility Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-dsdp594-species.txt NOAA Template File; DSDP 594 Species d18O and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-dsdp594-isot.txt NOAA Template File; DSDP 594 d18O, d13C and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-odp1125-isot.txt NOAA Template File; ODP 1125 d18O, d13C and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2019/caballero-gill2019-odp1125-reflect.txt NOAA Template File; ODP 1125 Reflectance Data USA/NOAA DIF Version 9.8.4 2019-04-25 2019-04-25