{"NOAAStudyId":"10491","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":"2010-05-20","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-10491.xml","doi":null,"earliestYearBP":41430,"earliestYearCE":-39480,"entryId":"noaa-ocean-10491","funding":[{"fundingAgency":"US Science Support Program","fundingGrant":null}],"investigators":"Robinson, R.S.; Martinez, P.; Pena, L.D.; Cacho, I.","mostRecentYearBP":2190,"mostRecentYearCE":-240,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10491","originalSource":null,"publication":[{"abstract":"The Eastern Equatorial Pacific (EEP) is a high nutrient-low chlorophyll \nregion of the ocean. Downcore nitrogen isotope records from the EEP \nhave been previously interpreted as a direct reflection of changes \nin nutrient consumption. However, the observed changes in sedimentary \nd15N since the last glacial maximum have no coherent relationship with \nexport productivity or an inferred variation in the iron-to-nitrate \nratio of the surface waters. Rather, downcore N isotope records in the \nEEP strongly resemble changes in the extent of water column \ndenitrification as recorded in nearby sedimentary d15N records along \nthe western margin of the Americas. This similarity is attributed to \nthe overprinting of the N isotopic composition of nitrate in the EEP \nthrough the advection of nitrate westward from the margins in the \nsubsurface. A local nitrogen isotope record of changes in the degree \nof nutrient consumption is extracted from the bulk sedimentary record \nby subtracting two different sedimentary d15N records of denitrification \nchanges from two new EEP d15N records (TR163-22 and ODP Site 1240). \nThe denitrification records used are from 1) the Central American \nmargin (ODP Site 1242) and 2) the South American margin (GeoB7139-2). \nThe degree of consumption in the surface waters declines rapidly from\nelevated values during the last glacial maximum to a pair of minima \naround 15 and 11–13 ka, and finally it increases into the Holocene. \nThe derived EEP nitrogen isotope record indicates that the regional \npeak in export productivity occurred when the supply of nutrients \nexceeded the apparently high demand. The influx of nutrients during \nthe deglaciation is attributed to the resumption of intense overturning \nin the Southern Ocean and the release of sequestered CO2 and nutrient-\nrich, O2 poor waters from the deep ocean. This has important \nimplications for understanding the glacial-interglacial scale variation \nin intermediate water suboxia and water column denitrification.\n\n","author":null,"citation":"Robinson, R.S., P. Martinez, L.D. Pena, and I. Cacho. 2009.  \nNitrogen isotopic evidence for deglacial changes in nutrient \nsupply in the eastern equatorial Pacific. \nPaleoceanography, 24, PA4213, doi:10.1029/2008PA001702. \n","edition":null,"identifier":{"id":"10.1029/2008PA001702","type":"doi","url":"http://dx.doi.org/10.1029/2008PA001702"},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2009,"reportNumber":null,"title":"Nitrogen isotopic evidence for deglacial changes in nutrient  supply in the eastern equatorial Pacific","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["biogeochemical cycles"],"site":[{"NOAASiteId":"30619","geo":{"geoType":"Feature","geometry":{"coordinates":[".52","-92.4"],"type":"POINT"},"properties":{"easternmostLongitude":"-92.4","maxElevationMeters":"-2830","minElevationMeters":"-2830","northernmostLatitude":"0.52","southernmostLatitude":"0.52","westernmostLongitude":"-92.4"}},"locationName":"Ocean>Pacific Ocean>North Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"19291","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2009/robinson2009.txt","linkText":"robinson2009.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"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":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"}]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2009/robinson2009.xls","linkText":"robinson2009.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"TR163-22B","dataTableNotes":null,"earliestYear":40350,"earliestYearBP":40350,"earliestYearCE":-38400,"mostRecentYear":2980,"mostRecentYearBP":2980,"mostRecentYearCE":-1030,"species":[],"timeUnit":"cal yr BP"}],"siteName":"TR163-22"},{"NOAASiteId":"37141","geo":{"geoType":"Feature","geometry":{"coordinates":[".167","-86.4667"],"type":"POINT"},"properties":{"easternmostLongitude":"-86.4667","maxElevationMeters":"-2921","minElevationMeters":"-2921","northernmostLatitude":"0.167","southernmostLatitude":"0.167","westernmostLongitude":"-86.4667"}},"locationName":"Ocean>Pacific Ocean>Eastern Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"19290","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2009/robinson2009.txt","linkText":"robinson2009.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"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":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"}]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2009/robinson2009.xls","linkText":"robinson2009.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"ODP1240","dataTableNotes":null,"earliestYear":41430,"earliestYearBP":41430,"earliestYearCE":-39480,"mostRecentYear":2190,"mostRecentYearBP":2190,"mostRecentYearCE":-240,"species":[],"timeUnit":"cal yr BP"}],"siteName":"ODP1240"}],"studyCode":null,"studyName":"Eastern Equatorial Pacific 40KYr Nitrogen Isotope Data","studyNotes":"Bulk sedimentary nitrogen isotope and nitrogen content data \nfrom piston core TR163-22 and ODP Site 1240 in the eastern \nequatorial Pacific Ocean. All nitrogen content and isotope \ndata were measured by EA-IRMS on bulk sediment. \n\n","version":"1.0","xmlId":"9155"}