{"NOAAStudyId":"24790","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":"2018-07-27","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-24790.xml","doi":null,"earliestYearBP":null,"earliestYearCE":null,"entryId":"noaa-ocean-24790","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ARC1204045"}],"investigators":"Keigwin, L.D.; Klotsko, S.; Zhao, N.; Reilly, B.; Giosan, L.; Driscoll, N.W.","mostRecentYearBP":null,"mostRecentYearCE":null,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/24790","originalSource":null,"publication":[{"abstract":"A period of cooling about 13,000 years ago interrupted about 2,000 years of deglacial warming. Known as the Younger Dryas (YD), the event is thought to have resulted from a slowdown of the Atlantic meridional overturning circulation in response to a sudden flood of Laurentide Ice Sheet meltwater that reached the Nordic Seas. Oxygen isotope evidence for a local source of meltwater to the open western North Atlantic from the Gulf of St Lawrence has been lacking. Here we report that the eastern Beaufort Sea contains the long-sought signal of 18O-depleted water. Beginning at ~12.94?±?0.15 thousand years ago, oxygen isotopes in the planktonic foraminifera from two sediment cores as well as sediment and seismic data indicate a flood of meltwater, ice and sediment to the Arctic via the Mackenzie River that lasted about 700 years. The minimum in the oxygen isotope ratios lasted ~130 years. We suggest that the floodwater travelled north along the Canadian Archipelago and then through the Fram Strait to the Nordic Seas, where freshening and freezing near sites of deep-water formation would have suppressed convection and caused the YD cooling by reducing the meridional overturning.","author":{"name":"Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll"},"citation":"Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll. 2018. Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling. Nature Geoscience. . doi: 10.1038/s41561-018-0169-6","edition":null,"identifier":{"id":"10.1038/s41561-018-0169-6","type":"doi","url":"http://dx.doi.org/10.1038/s41561-018-0169-6"},"issue":null,"journal":"Nature Geoscience","pages":null,"pubRank":"1","pubYear":2018,"reportNumber":null,"title":"Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57688","geo":{"geoType":"Feature","geometry":{"coordinates":["71.1037","71.106","-135.160667","-135.135483"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-135.135483","maxElevationMeters":"-373","minElevationMeters":"-401","northernmostLatitude":"71.106","southernmostLatitude":"71.1037","westernmostLongitude":"-135.160667"}},"locationName":"Ocean>Arctic Ocean>Beaufort Sea","mappable":"Y","paleoData":[{"NOAADataTableId":"36513","coreLengthMeters":16,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes","earth science>paleoclimate>paleocean>carbon isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt","linkText":"JPC15/27 d18O and d13C Data","urlDescription":"NOAA Template File","variables":[{"cvAdditionalInfo":"core name","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"mid point of 1-cm slice down the core; depth at JPC15/27 is a composite as described in Keigwin et al. 2018","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":"measured on Prism isotope ratio mass spectrometer NOSAMS","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Neogloboquadrina sp.>Neogloboquadrina pachyderma>Neogloboquadrina pachyderma sinistral","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"measured on Prism isotope ratio mass spectrometer NOSAMS","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Neogloboquadrina sp.>Neogloboquadrina pachyderma>Neogloboquadrina pachyderma sinistral","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"Cassidulina neoteretis; measured on Prism isotope ratio mass spectrometer NOSAMS","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"Cassidulina neoteretis; measured on Prism isotope ratio mass spectrometer NOSAMS","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"JPC15/JPC27 splice Keigwin2018","dataTableNotes":"Locations for spliced core: JPC15 71.1037 N, 135.135483 W, -687.3 m; JPC27 71.106 N, 135.160667 W, -693 m. Composite core length 16.69 m.","earliestYear":null,"earliestYearBP":null,"earliestYearCE":null,"mostRecentYear":null,"mostRecentYearBP":null,"mostRecentYearCE":null,"species":[],"timeUnit":null}],"siteName":"HLY1302 JPC15/27"},{"NOAASiteId":"57689","geo":{"geoType":"Feature","geometry":{"coordinates":["70.58255","-142.417"],"type":"POINT"},"properties":{"easternmostLongitude":"-142.417","maxElevationMeters":"-394","minElevationMeters":"-394","northernmostLatitude":"70.58255","southernmostLatitude":"70.58255","westernmostLongitude":"-142.417"}},"locationName":"Ocean>Arctic Ocean>Beaufort Sea","mappable":"Y","paleoData":[{"NOAADataTableId":"36514","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes","earth science>paleoclimate>paleocean>carbon isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc9.txt","linkText":"JPC09 d18O and d13C Data","urlDescription":"NOAA 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JPC06"},{"NOAASiteId":"57691","geo":{"geoType":"Feature","geometry":{"coordinates":["72.144417","-155.368483"],"type":"POINT"},"properties":{"easternmostLongitude":"-155.368483","maxElevationMeters":"-401","minElevationMeters":"-401","northernmostLatitude":"72.144417","southernmostLatitude":"72.144417","westernmostLongitude":"-155.368483"}},"locationName":"Ocean>Arctic Ocean>Beaufort Sea","mappable":"Y","paleoData":[{"NOAADataTableId":"36516","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>carbon isotopes","earth science>paleoclimate>paleocean>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt","linkText":"JPC02 d18O and d13C Data","urlDescription":"NOAA Template File","variables":[{"cvAdditionalInfo":"mid point of 1-cm slice down the 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