{"xmlId":"9012","NOAAStudyId":"10356","studyName":"Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data","doi":"https://doi.org/10.25921/7wzn-8a20","uuid":"2d1938ae-bf73-4f89-8090-d7fe3de3d6c7","dataPublisher":"NOAA","contactInfo":{"type":"CONTACT INFORMATION","shortName":"DOC/NOAA/NESDIS/NCEI","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","address":"325 Broadway, E/NE31","city":"Boulder","state":"CO","postalCode":"80305-3328","country":"USA","dataCenterUrl":"https://www.ncei.noaa.gov/products/paleoclimatology","email":"paleo@noaa.gov","phone":"828-271-4800","fax":null,"constraints":"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."},"dataType":"PALEOCEANOGRAPHY","investigators":"Pichat, S.; Sims, K.W.W.; François, R.; McManus, J.F.; Brown-Leger, S.; Albarède, F.","investigatorDetails":[{"firstName":"Sylvain","lastName":"Pichat","initials":"S.","orcId":"0000-0001-8558-6298"},{"firstName":"Kenneth","lastName":"Sims","initials":"K.W.W.","orcId":"0000-0001-6179-6610"},{"firstName":"Roger","lastName":"François","initials":"R.","orcId":"0000-0001-7729-3938"},{"firstName":"Jerry","lastName":"McManus","initials":"J.F.","orcId":"0000-0002-7365-1600"},{"firstName":"Susan","lastName":"Brown-Leger","initials":"S.","orcId":null},{"firstName":"Francis","lastName":"Albarède","initials":"F.","orcId":"0000-0003-1994-1428"}],"version":"1.0","funding":[{"fundingAgency":"French Ministry of Research","fundingGrant":null},{"fundingAgency":"European Council of Doctoral Candidates and Junior Researchers (Eurodoc)","fundingGrant":"SAFIR-980065327"},{"fundingAgency":"US National Science Foundation","fundingGrant":null},{"fundingAgency":"Woods Hole Oceanographic Institution","fundingGrant":"Mellon award"}],"studyNotes":"230Th, 231Pa, 232Th, 238U activities, (231Pa/230Th)xs,0 ratio, \nopal, carbonate, MnO2 and major elements concentrations for ODP849. \nRadionuclide concentrations were obtained by isotope dilution \nSF-ICP-MS. Major elements concentrations were measured by ICP-AES. \nOpal, carbonate and MnO2 were determined by normative calculations. \nAge model is based on oxygen isotope stratigraphy on Cibicides \nwuellerstorfi (Mix et al., 1995). \n","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/10356","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-10356.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-10356.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2011-01-07","entryId":"noaa-ocean-10356","earliestYearBP":85360,"mostRecentYearBP":4350,"earliestYearCE":-83410,"mostRecentYearCE":-2400,"publication":[{"author":{"name":"Pichat, S., K.W.W. Sims, R. François, J.F. McManus, S. Brown Leger, and F. Albarède"},"pubYear":2004,"title":"Lower export production during glacial periods in the equatorial Pacific derived from (231Pa/230Th)xs,0 measurements in deep-sea sediments","journal":"Paleoceanography","volume":"19","edition":null,"issue":"4","pages":null,"reportNumber":"PA4023","citation":"Pichat, S., K.W.W. Sims, R. François, J.F. McManus, S. Brown Leger, and F. Albarède. 2004. Lower export production during glacial periods in the equatorial Pacific derived from (231Pa/230Th)xs,0 measurements in deep-sea sediments. Paleoceanography, 19(4), PA4023. doi: 10.1029/2003PA000994","type":"publication","identifier":{"type":"doi","id":"10.1029/2003PA000994","url":"http://dx.doi.org/10.1029/2003PA000994"},"abstract":"The (231Pa/230Th)xs,0 records obtained from two cores from the western (MD97-2138; 1°25'S, 146°24'E, 1900 m) and eastern (Ocean Drilling Program Leg 138 Site 849, 0°11.59'N, 110°31.18'W, 3851 m) equatorial Pacific display similar variability over the last 85,000 years, i.e., from isotopic stages 1 to 5a, with systematically higher values during the Holocene, isotopic stage 3, and isotopic stage 5a, and lower values, approaching the production rate ratio of the two isotopes (0.093), during the colder periods corresponding to isotopic stages 2 and 4. We have also measured the 230Th-normalized biogenic preserved and terrigenous fluxes, as well as major and trace elements concentrations, in both cores. The (231Pa/230Th)xs,0 results combined with the changes in preserved carbonate and opal fluxes at the eastern site indicate lower productivity in the eastern equatorial Pacific during glacial periods. The (231Pa/230Th)xs,0 variations in the western equatorial Pacific also seem to be controlled by productivity (carbonate and/or opal). The generally high (231Pa/230Th)xs,0 ratios (>0.093) of the profile could be due to opal and/or MnO2 in the sinking particles. The profiles of (231Pa/230Th)xs,0 and 230Th-normalized fluxes indicate a decrease in exported carbonate, and possibly opal, during isotopic stages 2 and 4 in MD97-2138. Using 230Th-normalized flux, we also show that sediments from the two cores were strongly affected by sediment redistribution by bottom currents suggesting a control of mass accumulation rates by sediment focusing variability.","pubRank":"1"}],"site":[{"NOAASiteId":"19108","siteName":"ODP 849","siteCode":null,"mappable":"Y","locationName":"Ocean>Pacific Ocean>North Pacific Ocean","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":[".18","-110.52"]},"properties":{"southernmostLatitude":"0.18","northernmostLatitude":"0.18","westernmostLongitude":"-110.52","easternmostLongitude":"-110.52","minElevationMeters":"-3839","maxElevationMeters":"-3839"}},"paleoData":[{"dataTableName":"ODP849P","NOAADataTableId":"19128","earliestYear":85360,"mostRecentYear":4350,"timeUnit":"cal yr 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