noaa-ocean-19747 Iberian Margin IODP U1385 High Resolution Isotope and Trace Metal Data 1235 to 1320 ka Birner, B.; Hodell, D.A.; Tzedakis, P.C.; Skinner, L.C. Iberian Margin IODP U1385 High Resolution Isotope and Trace Metal Data 1235 to 1320 ka 2016-02-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19747 Investigator B. Birner Investigator D.A. Hodell Investigator P.C. Tzedakis Investigator L.C. Skinner earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,corrected,null,N,revised meter composite earth science paleoclimate paleoceanography delta 18O,Cibicidoides mundula,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate paleoceanography delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,corrected,null,N,corrected revised meter composite earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,age based on tuning sediment lightness L* to orbital precession earth science paleoclimate paleoceanography magnesium/calcium,Uvigerina peregrina,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,corrected,null,N,based on tuning sediment lightness to orbital precession earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on Mediterranean-tuned age model of Hodel et al. 2015 earth science paleoclimate paleoceanography delta 18O,Uvigerina peregrina,null,per mil PDB,null,paleoceanography,null,null,N,add 0.64 per mil to C. wuellerstorfi and C. mundulus values earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on insolation-tuned age model of Hodel et al. 2015 earth science paleoclimate climate reconstructions|paleoceanography sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,bottom water temperature using Mg/Ca U.peregrina earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleocean trace metals in carbonates earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation 1320000 cal yr BP 1235000 cal yr BP Complete 37.571417 37.571417 -10.126033 -10.126033 -2578 -2578 Ocean Atlantic Ocean North Atlantic Ocean IODP U1385>LATITUDE 37.571417>LONGITUDE -10.126033 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 Birner, B., D.A. Hodell, P.C. Tzedakis, and L.C. Skinner 2016 Paleoceanography 31 10.1002/2015PA002868

Although millennial-scale climate variability (<10 ka) has been well studied during the last glacial cycles, little is known about this important aspect of climate in the early Pleistocene, prior to the Middle Pleistocene Transition. Here we present an early Pleistocene climate record at centennial resolution for two representative glacials (marine isotope stages (MIS) 37-41 from approximately 1235 to 1320 ka) during the "41 ka world" at Integrated Ocean Drilling Program Site U1385 (the "Shackleton Site") on the southwest Iberian margin. Millennial-scale climate variability was suppressed during interglacial periods (MIS 37, MIS 39, and MIS 41) and activated during glacial inceptions when benthic d18O exceeded 3.2‰. Millennial variability during glacials MIS 38 and MIS 40 closely resembled Dansgaard-Oeschger events from the last glacial (MIS 3) in amplitude, shape, and pacing. The phasing of oxygen and carbon isotope variability is consistent with an active oceanic thermal bipolar see-saw between the Northern and Southern Hemispheres during most of the prominent stadials. Surface cooling was associated with systematic decreases in benthic carbon isotopes, indicating concomitant changes in the meridional overturning circulation. A comparison to other North Atlantic records of ice rafting during the early Pleistocene suggests that freshwater forcing, as proposed for the late Pleistocene, was involved in triggering or amplifying perturbations of the North Atlantic circulation that elicited a bipolar see-saw response. Our findings support similarities in the operation of the climate system occurring on millennial time scales before and after the Middle Pleistocene Transition despite the increases in global ice volume and duration of the glacial cycles. STUDY NOTES: The study uses sections 1 to 6 in Core 339-U1385D-15H (123.59–135.82 meter below sea floor (mbsf)) and sections 5 and 6 in Core 339-U1385E-16H (135.24–136.97 mbsf). The splice tie point between the cores occurs at 147.32 corrected revised meters composite depth (crmcd) where U1385D-15H-6, 80 cm is tied to U1385E-16H-5, 59 cm, yielding a ~8 m long section (140.26–148.88 crmcd) spanning MIS 37–41. Depth is a corrected revised meter composite depth across all cores. Instrument precision of repeated standard measurements was 0.06 per mil for d13C and 0.08 per mil for d18O. d18O U. peregrina record uses C. wuellerstorfi and C. mundulus values adjusted by +0.64 per mil. Precision of deep water temperature calculation is 0.87 degrees C. Precision of d18O water is 0.23 per mil SMOW. Error on Mg/Ca U. peregrina analysis: ~4-6%. Provided Keywords: millennial variability, early Pleistocene, Iberian margin

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/birner2016/birner2016-trace.txt Formatted Text File; U1385 Trace Metal and BWT Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/birner2016/birner2016-isot.txt Formatted Text File; U1385 Stable Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11