noaa-ocean-14170 Kuroshio Extension Oxygen Isotope Data During the Pliocene-Pleistocene Climate Transition Venti, N.L.; Billups, K. Kuroshio Extension Oxygen Isotope Data During the Pliocene-Pleistocene Climate Transition 2013-04-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/14170 Investigator N.L. Venti Investigator K. Billups earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,core top depth earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,"mbsf; unique(""recompressed"")" earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,shipboard reported depth earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,core recovery percent earth science paleoclimate paleoceanography delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes geoscientificInformation 3000000 cal yr BP 1760000 cal yr BP Complete 36.127 36.127 158.2016 158.2016 -3346 -3346 Ocean Pacific Ocean North Pacific Ocean ODP 1208>LATITUDE 36.127>LONGITUDE 158.2016 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 Venti, N.L., and Billups, K. 2013 Marine Micropaleontology 101 106-114 10.1016/j.micro2013.02.004

The Pliocene–Pleistocene climate transition offers an opportunity to study the effect of glaciation on the ocean–climate system. We present a Globigerinoides ruber δ18O record from Ocean Drilling Program Site 1208 (Kuroshio Current Extension; KCE). This exclusively (sub)tropical foraminifer, a summer/fall mixed-layer dweller at the KCE, affords the first long (3.0 Ma to 1.8 Ma) orbital-scale (2.5-kyr time step) account of the sea surface in this area. The section's temperature-corrected benthic foraminiferal δ18O record constrains global changes in ice volume, yielding a Δδ18O record that primarily reflects summer/fall KCE hydrography (temperature and salinity). A 0.3‰ decrease in Δδ18O values at 2.7 Ma coincides with the onset of Northern Hemisphere glaciation, indicating as much as 1.5°C warming during the summer/fall to suggest that the subtropical North Pacific sea surface provided heat and moisture for expanding ice sheets. On the orbital scale, the 41-kyr cycle that dominates high-latitude climate is absent from the Δδ18O record, indicating a stable surface water hydrographic regime on this time scale. Rather, the Δδ18O record varies at and is coherent with the 19-kyr precessional component of the regional insolation curve, supporting a direct response to subtropical insolation and insensitivity to extra-regional forcing factors, such as ice sheets. STUDY NOTES: Oxygen isotope measurements of Globigerinoides ruber span the Plio-Pleistocene boundary (3.0 to 1.76 Ma) at 2500-year time step. Stable-isotope analyses were conducted at the University of Delaware with the GV Instruments IsoPrime dual-inlet mass spectrometer. Oxygen isotopic values have been corrected to the Peedee Belemnite standard using NBS-19 and Carrara Marble as an in-house standard.

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