{"NOAAStudyId":"20569","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":"2016-10-06","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-20569.xml","doi":null,"earliestYearBP":119554,"earliestYearCE":-117604,"entryId":"noaa-icecore-20569","funding":[{"fundingAgency":"Swiss National Science Foundation","fundingGrant":null}],"investigators":"Eicher, O.; Baumgartner, M.; Schilt, A.; Schmitt, J.; Schwander, J.; Stocker, T.F.; Fischer, H.","mostRecentYearBP":294,"mostRecentYearCE":1656,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/20569","originalSource":null,"publication":[{"abstract":"Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation signature, although the underlying physical mechanisms are still a matter of debate. Here we present a high-resolution TAC record over the whole North Greenland Ice Core Project ice core, covering the last 120000 years, which independently supports an insolation signature in Greenland. Wavelet analysis reveals a clear precession and obliquity signal similar to previous findings on Antarctic TAC, with a different insolation history. In our high-resolution record we also find a decrease of 4-6% (4-5mLkg-1) in TAC as a response to Dansgaard-Oeschger events (DO events). TAC starts to decrease in parallel to increasing Greenland surface temperature and slightly before CH4 reacts to the warming but also shows a two-step decline that lasts for several centuries into the warm interstadial. The TAC response is larger than expected considering only changes in air density by local temperature and atmospheric pressure as a driver, pointing to a transient firnification response caused by the accumulation-induced increase in the load on the firn at bubble close-off, while temperature changes deeper in the firn are still small.","author":{"name":"Olivier Eicher, Matthias Baumgartner, Adrian Schilt, Jochen Schmitt, Jakob Schwander, Thomas F. Stocker, and Hubertus Fischer"},"citation":"Olivier Eicher, Matthias Baumgartner, Adrian Schilt, Jochen Schmitt, Jakob Schwander, Thomas F. Stocker, and Hubertus Fischer. 2016. Climatic and insolation control on the high-resolution total air content in the NGRIP ice core. Climate of the Past, 12(10), 1979-1993. doi: 10.5194/cp-12-1979-2016","edition":null,"identifier":{"id":"10.5194/cp-12-1979-2016","type":"doi","url":"http://dx.doi.org/10.5194/cp-12-1979-2016"},"issue":"10","journal":"Climate of the Past","pages":"1979-1993","pubRank":"1","pubYear":2016,"reportNumber":null,"title":"Climatic and insolation control on the high-resolution total air content in the NGRIP ice core","type":"publication","volume":"12"}],"reconstruction":"N","scienceKeywords":["Dansgaard-Oeschger 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":"31321","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>ice core>atmospheric gas"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/gases/ngrip2016tac.txt","linkText":"NGRIP Ice Core Total Air Content Data","urlDescription":"Data File","variables":[{"cvAdditionalInfo":"AICC2012","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>ice age"},{"cvAdditionalInfo":"AICC2012","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"},{"cvAdditionalInfo":"mL/kg STP","cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milliliter per kilogram","cvWhat":"physical property>porosity>air content"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milliliter per kilogram","cvWhat":"physical property>porosity>air content"}]}],"dataTableName":"NGRIP2016TAC","dataTableNotes":null,"earliestYear":119554,"earliestYearBP":119554,"earliestYearCE":-117604,"mostRecentYear":294,"mostRecentYearBP":294,"mostRecentYearCE":1656,"species":[],"timeUnit":"cal yr BP"}],"siteName":"NGRIP"}],"studyCode":null,"studyName":"NGRIP Ice Core 120,000 Year Total Air Content Data","studyNotes":"North Greenland Ice Core Project (NGRIP) high-resolution Total Air Content (TAC) data for the entire 120,000 year NGRIP record","version":"1.0","xmlId":"18385"}