{"NOAAStudyId":"2628","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2005-01-01","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-2628.xml","doi":null,"earliestYearBP":29750964,"earliestYearCE":-29749014,"entryId":"noaa-ocean-2628","funding":[],"investigators":"Anderson, L.D.; Delaney, M.L.","mostRecentYearBP":20120856,"mostRecentYearCE":-20118906,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/2628","originalSource":null,"publication":[{"abstract":"Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (Baex), opal, and CaCO3 mass accumulation rates (MARs)), nutrient and organic carbon burial (reactive phosphorus (Pr) MARs), and redox conditions (U and Mn enrichments) to investigate hydrographic conditions associated with climatic shifts from the Oligocene through the early Miocene. Orbitally induced cyclicity in U and Mn enrichments (100 kyr) suggests shifts in deepwater characteristics. However, CaCO3 dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. These observations indicate that a well developed \"\"modern-type\"\" Antarctic Circumpolar Current (ACC) did not yet exist over the period from 30 to 20 Ma, with two potential consequences: The Southern Ocean was not functioning as a silica trap, permitting a broader distribution of silica that may have facilitated organic carbon burial in the ocean in general, and the lack ofa deeply mixing ACC may have facilitated organic carbon burial in the Southern Ocean. Both the relative (high opal MARs coincident with low CaCO3 MARs) and absolute (high Pr MARs) burial of organic carbon suggest a powerful mechanism for pCO2 drawdown.","author":null,"citation":"Anderson, L.D. and M.L. Delaney. 2005. Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography 20(3), PA3011. doi:10.1029/2004PA001082","edition":null,"identifier":null,"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2005,"reportNumber":null,"title":"Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"19256","geo":{"geoType":"Feature","geometry":{"coordinates":["-42.908333","8.9"],"type":"POINT"},"properties":{"easternmostLongitude":"8.9","maxElevationMeters":"-3702","minElevationMeters":"-3702","northernmostLatitude":"-42.908333","southernmostLatitude":"-42.908333","westernmostLongitude":"8.9"}},"locationName":"Ocean>Atlantic Ocean>South Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"4326","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>lithology","earth science>paleoclimate>paleocean>physical properties","earth science>paleoclimate>paleocean>geochemistry","earth science>paleoclimate>paleocean>age control"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2005b","linkText":"anderson2005b","urlDescription":"Original Data and Full Metadata","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>age control","earth science>paleoclimate>paleocean>geochemistry","earth science>paleoclimate>paleocean>physical properties","earth science>paleoclimate>paleocean>lithology"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1090d-tab.txt","linkText":"odp1090d-tab.txt","urlDescription":"Alternate Format Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":"detrital phosphorus","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per gram","cvWhat":"chemical composition>element or single-element molecule>phosphorus"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"radiocarbon year before present","cvWhat":"age 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silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"weight percent","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":"reactive","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per gram","cvWhat":"chemical composition>element or single-element molecule>phosphorus"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"unspecified unit","cvWhat":"chemical composition>element or single-element molecule>phosphorus"},{"cvAdditionalInfo":"terrigenous sediment mass accumulation rate determined as Total MAR - carbonate MAR - biogenic silica MAR","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"gram per square centimeter per kiloyear","cvWhat":"geological material>bulk geological material>mineral matter"},{"cvAdditionalInfo":"determined as total sediment % minus carbonate % minus biogenic silica %","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"weight percent","cvWhat":"geological material>bulk geological material>mineral matter"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"micromole per gram","cvWhat":"chemical composition>element or single-element molecule>titanium"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"nanomole per gram","cvWhat":"chemical composition>element or single-element molecule>uranium"}]}],"dataTableName":"ODP1090D","dataTableNotes":"Barium excess = [Ba]- (crustal abuntance of Ba/Al (1.47 mmol/mol) * [Al]). P total = P reactive + P detrital. Ptd = P conc. from total digestion of the sediment.","earliestYear":29750964,"earliestYearBP":29750964,"earliestYearCE":-29749014,"mostRecentYear":20120856,"mostRecentYearBP":20120856,"mostRecentYearCE":-20118906,"species":[],"timeUnit":"14C yr BP"}],"siteName":"ODP 1090"}],"studyCode":null,"studyName":"Southern Ocean Oligocene to early Miocene Paleoceanographic Data ","studyNotes":null,"version":"1.0","xmlId":"1698"}