{"NOAAStudyId":"18318","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":"2015-04-02","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-18318.xml","doi":null,"earliestYearBP":160020,"earliestYearCE":-158070,"entryId":"noaa-ocean-18318","funding":[],"investigators":"Martínez-Garcia, A.; Sigman, D.M.; Ren, H.; Anderson, R.F.; Straub, M.; Hodell, D.A.; Jaccard, S.L.; Eglinton, T.I.; Haug, G.H.","mostRecentYearBP":1380,"mostRecentYearCE":570,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/18318","originalSource":null,"publication":[{"abstract":"John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age reduction in atmospheric carbon dioxide (CO2). In a sediment core from the Subantarctic Atlantic, we measured foraminifera-bound nitrogen isotopes to reconstruct ice age nitrate consumption, burial fluxes of iron, and proxies for productivity. Peak glacial times and millennial cold events are characterized by increases in dust flux, productivity, and the degree of nitrate consumption; this combination is uniquely consistent with Subantarctic iron fertilization. The associated strengthening of the Southern Ocean's biological pump can explain the lowering of CO2 at the transition from mid-climate states to full ice age conditions as well as the millennial-scale CO2 oscillations","author":{"name":"Martinez-Garcia, A., D.M. Sigman, H. Ren, R.F. Anderson, M. Straub, D.A. Hodell, S.L. Jaccard, T.I. Eglinton, and G.H. Haug"},"citation":"Martinez-Garcia, A., D.M. Sigman, H. Ren, R.F. Anderson, M. Straub, D.A. Hodell, S.L. Jaccard, T.I. Eglinton, and G.H. Haug. 2014. Iron Fertilization of the Subantarctic Ocean During the Last Ice Age. Science, 343(6177), 1347-1350. doi: 10.1126/science.1246848","edition":null,"identifier":{"id":"10.1126/science.1246848","type":"doi","url":"http://dx.doi.org/10.1126/science.1246848"},"issue":"6177","journal":"Science","pages":"1347-1350","pubRank":"1","pubYear":2014,"reportNumber":null,"title":"Iron Fertilization of the Subantarctic Ocean During the Last Ice Age","type":"publication","volume":"343"}],"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":"28714","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-d15n.txt","linkText":"ODP1090 d15N Data","urlDescription":"Formatted Text File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Globigerina sp.>Globigerina bulloides","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"}]}],"dataTableName":"ODP1090 d15N M-G14","dataTableNotes":null,"earliestYear":158140,"earliestYearBP":158140,"earliestYearCE":-156190,"mostRecentYear":1380,"mostRecentYearBP":1380,"mostRecentYearCE":570,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"28715","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-fe.txt","linkText":"ODP1090 Fe Flux Data","urlDescription":"Formatted Text File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milligram per square centimeter per kiloyear","cvWhat":"chemical composition>element or single-element molecule>iron"}]}],"dataTableName":"ODP1090 Fe flux M-G14","dataTableNotes":null,"earliestYear":160020,"earliestYearBP":160020,"earliestYearCE":-158070,"mostRecentYear":1590,"mostRecentYearBP":1590,"mostRecentYearCE":360,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"28716","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>biomarkers"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-alk.txt","linkText":"ODP1090 Alkenone Flux Data","urlDescription":"Formatted Text File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":"Alkenone flux","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per square centimeter per kiloyear","cvWhat":"chemical composition>compound>organic compound>organooxygen compound>ketone>alkenone"}]}],"dataTableName":"ODP1090 alkenone flux M-G14","dataTableNotes":null,"earliestYear":155280,"earliestYearBP":155280,"earliestYearCE":-153330,"mostRecentYear":1590,"mostRecentYearBP":1590,"mostRecentYearCE":360,"species":[],"timeUnit":"cal yr BP"}],"siteName":"ODP 1090"}],"studyCode":null,"studyName":"Subantarctic Atlantic Ocean Foraminifera-bound d15N, Iron and Alkenone Flux Data for the last 160,000 years","studyNotes":"Foraminifera-bound d15N, iron and alkenone fluxes measured in ODP Site 1090 over the past glacial cycle.\n    Provided Keywords: Iron Fertilization, Carbon Dioxide, Southern Ocean, Nitrogen Isotopes, Alkenones","version":"1.0","xmlId":"16023"}