{"NOAAStudyId":"10291","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":"2011-02-02","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-10291.xml","doi":null,"earliestYearBP":40987,"earliestYearCE":-39037,"entryId":"noaa-icecore-10291","funding":[{"fundingAgency":"Deutsche Forschungsgemeinschaft","fundingGrant":"MEPHISTO"},{"fundingAgency":"Swiss National Science Foundation","fundingGrant":"primeMETHANE"},{"fundingAgency":"German Secretary of Education and Research","fundingGrant":"GEOTECHNOLOGIEN"},{"fundingAgency":"European Research Council","fundingGrant":"MATRICs"}],"investigators":"Bock, M.; Schmitt, J.; Möller, L.; Spahni, R.; Blunier, T.; Fischer, H.","mostRecentYearBP":33678,"mostRecentYearCE":-31728,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10291","originalSource":null,"publication":[{"abstract":"The causes of past changes in the global methane cycle \nand especially the role of marine methane hydrate (clathrate) \ndestabilization events are a matter of debate. Here we present \nevidence from the North Greenland Ice Core Project ice core \nbased on the hydrogen isotopic composition of methane [dD(CH4)] \nthat clathrates did not cause atmospheric methane concentration \nto rise at the onset of Dansgaard-Oeschger (DO) events 7 and 8. \nBox modeling supports boreal wetland emissions as the most likely \nexplanation for the interstadial increase. Moreover, our data \nshow that dD(CH4) dropped 500 years before the onset of DO 8, \nwith CH4 concentration rising only slightly. This can be \nexplained by an early climate response of boreal wetlands, \nwhich carry the strongly depleted isotopic signature of \nhigh-latitude precipitation at that time. \n","author":null,"citation":"Bock, M., J. Schmitt, L. Möller, R. Spahni, T. Blunier, \nand H. Fischer. 2010. \nHydrogen Isotopes Preclude Marine Hydrate CH4 Emissions \nat the Onset of Dansgaard-Oeschger Events. \nScience, Vol. 328, pp. 1686. \nDOI: 10.1126/science.1187651","edition":null,"identifier":{"id":"10.1126/science.1187651","type":"doi","url":"http://dx.doi.org/10.1126/science.1187651"},"issue":null,"journal":"Science","pages":null,"pubRank":"1","pubYear":null,"reportNumber":null,"title":"Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions  at the Onset of Dansgaard-Oeschger Events","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Dansgaard-Oeschger cycles","biogeochemical cycles"],"site":[{"NOAASiteId":"31412","geo":{"geoType":"Feature","geometry":{"coordinates":["75.1","-42.33"],"type":"POINT"},"properties":{"easternmostLongitude":"-42.33","maxElevationMeters":"2917","minElevationMeters":"2917","northernmostLatitude":"75.1","southernmostLatitude":"75.1","westernmostLongitude":"-42.33"}},"locationName":"Continent>North America>Greenland","mappable":"Y","paleoData":[{"NOAADataTableId":"19078","coreLengthMeters":36,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>ice core>hydrogen isotopes","earth science>paleoclimate>ice core>atmospheric gas"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip2010ddch4.txt","linkText":"ngrip2010ddch4.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":null,"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":"chemical composition>compound>organic compound>hydrocarbon>alkane>n-alkane>methane","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>hydrocarbon>alkane>n-alkane>methane","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"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":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar year before present","cvWhat":"age variable>age>gas age"}]},{"NOAAKeywords":["earth science>paleoclimate>ice core>atmospheric gas","earth science>paleoclimate>ice core>hydrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip2010ddch4.xls","linkText":"ngrip2010ddch4.xls","urlDescription":"Data","variables":[]}],"dataTableName":"NGRIP 1993-2129m","dataTableNotes":null,"earliestYear":40987,"earliestYearBP":40987,"earliestYearCE":-39037,"mostRecentYear":33678,"mostRecentYearBP":33678,"mostRecentYearCE":-31728,"species":[],"timeUnit":"cal yr BP"}],"siteName":"NGRIP"}],"studyCode":null,"studyName":"NGRIP Ice Core 41-34 KYrBP dD(CH4) Data ","studyNotes":"Deuterium isotope data of methane (dDCH4) from the NGRIP \nice core, for 41-34 KYrBP. \n","version":"1.0","xmlId":"8965"}