{"NOAAStudyId":"17916","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":"2015-01-27","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-17916.xml","doi":null,"earliestYearBP":2327970,"earliestYearCE":-2326020,"entryId":"noaa-ocean-17916","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"1060779"},{"fundingAgency":"CNRS","fundingGrant":"ECLIPSE"}],"investigators":"Robinson, R.S.; Etourneau, J.; Martinez, P.; Schneider, R.R.","mostRecentYearBP":990,"mostRecentYearCE":960,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/17916","originalSource":null,"publication":[{"abstract":"Bioavailable nitrogen is removed from the oceans in oxygen-deficient benthic and pelagic environments by denitrification. Future warming is predicted to reduce ocean oxygenation and to cause hypoxic regions to expand, potentially accelerating denitrification. A compilation of high-resolution sedimentary nitrogen isotope (dN15) records from the eastern tropical Pacific, North Pacific, and the Arabian Sea, and a global multi-site survey are presented as evidence for weak pelagic denitrification at the end of the Pliocene warm period. Mean dN15 values increased in the major oxygen minimum zones (OMZs) between 2.1 and 1.5 Ma. Pelagic denitrification strengthened during a period of long term global cooling, despite solubility driven increases in initial oxygen contents of Antarctic intermediate and Subantarctic mode waters ventilating the OMZs. This trend is opposite to the predicted mean trend for a cooling ocean as well as to the observed glacial-interglacial variation. Several alternatives to explain the shift are proposed, including a rise in net respiration, a progressive increase in the ventilation age of the deep ocean associated with million year scale, secular cooling, and a shoaling of the remotely ventilated thermocline to shallow depths corresponding to the zone of peak subsurface respiration. Given no evidence for a net increase in production, we assert that large-scale, climate-driven changes in ocean circulation regulate long timescale variations in the extent of pelagic denitrification. Additional data and modeling are required to fully explain the observations.","author":{"name":"Rebecca S. Robinson, Johan Etourneau, Philippe M. Martinez, Ralph Schneider"},"citation":"Rebecca S. Robinson, Johan Etourneau, Philippe M. Martinez, Ralph Schneider. 2014. Expansion of pelagic denitrification during early Pleistocene cooling . Earth and Planetary Science Letters, 389, 52-61. doi: 10.1016/j.epsl.2013.12.022","edition":null,"identifier":{"id":"10.1016/j.epsl.2013.12.022","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2013.12.022"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"52-61","pubRank":"1","pubYear":2014,"reportNumber":null,"title":"Expansion of pelagic denitrification during early Pleistocene cooling ","type":"publication","volume":"389"}],"reconstruction":"N","scienceKeywords":["biogeochemical cycles"],"site":[{"NOAASiteId":"52542","geo":{"geoType":"Feature","geometry":{"coordinates":["7.85583","-83.60694"],"type":"POINT"},"properties":{"easternmostLongitude":"-83.60694","maxElevationMeters":"-1364","minElevationMeters":"-1364","northernmostLatitude":"7.85583","southernmostLatitude":"7.85583","westernmostLongitude":"-83.60694"}},"locationName":"Ocean>Pacific Ocean>Eastern Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"28199","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2014/robinson2014.txt","linkText":"ODP1242 d15N and %N Data","urlDescription":"Data File","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":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":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"}]}],"dataTableName":"Robinson2014ODP1242d15N","dataTableNotes":null,"earliestYear":2327970,"earliestYearBP":2327970,"earliestYearCE":-2326020,"mostRecentYear":990,"mostRecentYearBP":990,"mostRecentYearCE":960,"species":[],"timeUnit":"cal yr BP"}],"siteName":"ODP1242"}],"studyCode":null,"studyName":"Eastern Tropical Pacific ODP1242 2.3Ma d15N Data","studyNotes":"Nitrogen isotope (d15N) and percent Nitrogen data from Eastern Tropical Pacific Ocean Drilling Program core ODP1242 for the Pleistocene and Holocene (past 2.3 million years).","version":"1.0","xmlId":"15619"}