noaa-ocean-6408 South Atlantic Pleistocene ODP Leg 177 Stable Isotope Data Hodell, D.A.; Venz, K.A.; Charles, C.D.; Ninnemann, U.S. South Atlantic Pleistocene ODP Leg 177 Stable Isotope Data 2003-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6408 Investigator D.A. Hodell Investigator K.A. Venz Investigator C.D. Charles Investigator U.S. Ninnemann earth science paleoclimate paleoceanography delta 13C,Cibicidoides sp.,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 delta 13C,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography foraminifer fragmentation,null,null,percent,null,paleoceanography,null,null,N,Planktic foraminifera earth science paleoclimate paleoceanography delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography calcium carbonate,sediment,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Neogloboquadrina pachyderma,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean lithology earth science paleoclimate paleocean population abundance earth science paleoclimate paleocean age control geoscientificInformation 2903500 14C yr BP 0 14C yr BP 2903500 cal yr BP 0 cal yr BP Complete -42.92 -40.93 8.9 13.57 -4621 -2082 Ocean Atlantic Ocean South Atlantic Ocean ODP 1088B>LATITUDE -41.13>LONGITUDE 13.57 Ocean Atlantic Ocean South Atlantic Ocean ODP1089>LATITUDE -40.93>LONGITUDE 9.9 Ocean Atlantic Ocean South Atlantic Ocean ODP1090/TTN057-6>LATITUDE -42.92>LONGITUDE 8.9 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 Hodell, D.A., K.A. Venz, C.D. Charles, and U.S. Ninnemann. 2003. Pleistocene vertical carbon isotope and carbonate gradients in the South Atlantic sector of the Southern Ocean.Geochemistry, Geophysics, Geosystems, 4(1), 1004.

We demonstrate that the carbon isotopic signal of mid-depth waters evolved differently from deep waters in the South Atlantic sector of the Southern Ocean during the Pleistocene. Deep sites (>3700 m) exhibit large glacial-to-interglacial variations in benthic d13C, whereas the amplitude of the d13C signal at Site 1088 (~2100 m water depth) is small. Unlike the deep sites, at no time during the Pleistocene were benthic d13C values at Site 1088 lower than those of the deep Pacific. Reconstruction of intermediate-to-deep d13C gradients (ŋ13CI-D) supports the existence of a sharp chemocline between 2100 and 2700 m during most glacial stages of the last 1.1 myr. This chemical divide in the glacial Southern Ocean separated well-ventilated water above ~2500 m from poorly ventilated water below. The ŋ13CI-D signal parallels the Vostok atmospheric pCO2 record for the last 400 kyr, lending support to physical models that invoke changes in Southern Ocean deep water ventilation as a mechanism for changing atmospheric pCO2. The emergence of a strong 100-kyr cycle in ŋ13CI-D during the mid-Pleistocene supports a change in vertical fractionation and deep-water ventilation rates in the Southern Ocean, and is consistent with possible CO2-forcing of this climate transition.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o1090-t6-tab.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2003 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/1089hod3-tab.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/1088hod3-tab.txt USA/NOAA DIF Version 9.8.4 2019-05-06 2019-05-06