{"NOAAStudyId":"2446","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":"2000-12-28","dataPublisher":"NOAA","dataType":"ICE CORES","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/ice-core","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-icecore-2446.xml","doi":null,"earliestYearBP":15000,"earliestYearCE":-13050,"entryId":"noaa-icecore-2446","funding":[],"investigators":"Severinghaus, J.; Brook, E.J.","mostRecentYearBP":15000,"mostRecentYearCE":-13050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/2446","originalSource":null,"publication":[],"reconstruction":"N","scienceKeywords":["PAGES 2k Network","PAGES LOTRED SA2k"],"site":[{"NOAASiteId":"19978","geo":{"geoType":"Feature","geometry":{"coordinates":["72.6","-38.5"],"type":"POINT"},"properties":{"easternmostLongitude":"-38.5","maxElevationMeters":"3200","minElevationMeters":"3200","northernmostLatitude":"72.6","southernmostLatitude":"72.6","westernmostLongitude":"-38.5"}},"locationName":"Continent>North America>Greenland","mappable":"Y","paleoData":[{"NOAADataTableId":"38358","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>ice core>atmospheric gas"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/gases/severinghaus_1999.txt","linkText":"severinghaus_1999.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>element or single-element molecule>oxygen gas","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"delta 40Ar/4","cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 40Ar"},{"cvAdditionalInfo":"delta 40Ar/4","cvDataType":"ICE CORES","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 40Ar"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"parts per billion","cvWhat":"chemical composition>compound>organic compound>hydrocarbon>alkane>n-alkane>methane"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil AIR","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N>delta 15N excess"}]}],"dataTableName":"GISP2 Deglacial gases Severinghaus1999","dataTableNotes":"Collection age is approximate period of record. Isotope ratios are expressed as deltas, and include d15N, d18O \r\n(of molecular oxygen, O2), and d40Ar/4 (40/36 ratio).  \r\nPrecision is ±0.007, ±0.05, and ±0.008 per mil for the three, \r\nrespectively, and is defined as the 1 sigma pooled standard\r\ndeviation from the mean of replicate samples cut from the \r\nsame depth in the ice core.  d40Ar is divided by four to \r\nfacilitate comparison with d15N, since d40Ar is fractionated \r\nexactly four times as much as d15N by gravity.\r\nThe standard gas for all three is the contemporary atmosphere, \r\nas these ratios are highly stable in air.\r\nData are vs. ice core depth.  \r\nData set from Severinghaus and Brook, 1999\r\nFull reference: Severinghaus, J. P., and Brook, E. J., Abrupt climate change at the end of the last glacial period inferred from trapped air in polar ice, Science 286, 930-934 (1999).\r\nGISP2 ice core\t\t\t\t\t\t\t\tData run at University of Rhode Island (URI) and Scripps Institution of Oceanography (SIO) are noted,\t\t\t\t\t\t\t\t\r\nbecause there may be a ~0.01 permil offset between the two data sets (see text of paper).\t\t\t\t\t\t\t\t\t\r\nPrecision (defined as the pooled standard deviation from the mean of replicate ice samples cut from the same depth) is ±0.007 and ±0.008 for d15N and d40Ar/4, respectively, in the ice core data.\t\t\t\t\t\t\t\t\r\nPrecision in the firn air data is ±0.002 permil for both d15N and d40Ar/4.","earliestYear":15000,"earliestYearBP":15000,"earliestYearCE":-13050,"mostRecentYear":15000,"mostRecentYearBP":15000,"mostRecentYearCE":-13050,"species":[],"timeUnit":"cal yr BP"}],"siteName":"GISP2"}],"studyCode":null,"studyName":"GISP2 - Last Glacial Transition d18O, d15N, d40Ar,CH4 Data","studyNotes":null,"version":"1.0","xmlId":"1300"}