{"NOAAStudyId":"9959","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":"2010-07-16","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-9959.xml","doi":null,"earliestYearBP":1949,"earliestYearCE":1,"entryId":"noaa-icecore-9959","funding":[{"fundingAgency":"CSIRO","fundingGrant":null},{"fundingAgency":"Australian Climate Change Science Program","fundingGrant":null},{"fundingAgency":"US National Science Foundation","fundingGrant":null}],"investigators":"MacFarling Meure, C.; Etheridge, D.M.; Trudinger, C.; Steele, P.; Langenfelds, R.L.; van Ommen, T.D.; Smith, A.M.; Elkins, J.","mostRecentYearBP":-54,"mostRecentYearCE":2004,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/9959","originalSource":null,"publication":[{"abstract":"New measurements of atmospheric greenhouse gas concentrations in ice\nfrom Law Dome, Antarctica reproduce published Law Dome CO2 and CH4\nrecords, extend them back to 2000 years BP, and include N2O.\nThey have very high air age resolution, data density and measurement\nprecision. Firn air measurements span the past 65 years and overlap\nwith the ice core and direct atmospheric observations. Major increases\nin CO2, CH4 and N2O concentrations during the past 200 years followed\na period of relative stability beforehand. Decadal variations during\nthe industrial period include the stabilization of CO2 and slowing\nof CH4 and N2O growth in the 1940s and 1950s. Variations of up to\n10 ppm CO2, 40 ppb CH4 and 10 ppb N2O occurred throughout the\npreindustrial period.  Methane concentrations grew by 100 ppb\nfrom AD 0 to 1800, possibly due to early anthropogenic emissions.\n","author":null,"citation":"MacFarling Meure, C., D. Etheridge, C. Trudinger, P. Steele,\nR. Langenfelds, T. van Ommen, A. Smith, and J. Elkins.  2006.\nThe Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 years BP.\nGeophysical Research Letters, Vol. 33, No. 14, L14810 10.1029/2006GL026152.\n","edition":null,"identifier":{"id":"10.1029/2006GL026152","type":"doi","url":"http://dx.doi.org/10.1029/2006GL026152"},"issue":null,"journal":"Geophysical Research Letters","pages":null,"pubRank":"1","pubYear":2006,"reportNumber":null,"title":"The Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 years BP","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["carbon cycle"],"site":[{"NOAASiteId":"19999","geo":{"geoType":"Feature","geometry":{"coordinates":["-66.73","112.83"],"type":"POINT"},"properties":{"easternmostLongitude":"112.83","maxElevationMeters":"1390","minElevationMeters":"1390","northernmostLatitude":"-66.73","southernmostLatitude":"-66.73","westernmostLongitude":"112.83"}},"locationName":"Continent>Antarctica","mappable":"Y","paleoData":[{"NOAADataTableId":"18808","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>ice core>atmospheric gas"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2006.txt","linkText":"law2006.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":"CLIMATE FORCING|ICE CORES","cvDetail":"smoothed","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"parts per quadrillion","cvWhat":"chemical composition>compound>inorganic compound>nitrous oxide"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"parts per quadrillion","cvWhat":"chemical composition>compound>inorganic compound>nitrous oxide"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age>gas age"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"smoothed","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":"CLIMATE FORCING|ICE CORES","cvDetail":"corrected","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":"NOAA 04 scale?","cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"smoothed","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":"NOAA 04 scale?","cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"corrected","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":"CLIMATE FORCING|ICE CORES","cvDetail":"smoothed","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"parts per million","cvWhat":"chemical composition>compound>inorganic compound>carbon dioxide"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE FORCING|ICE CORES","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"atmospheric material>bulk atmosphere","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"parts per million","cvWhat":"chemical composition>compound>inorganic compound>carbon dioxide"}]},{"NOAAKeywords":["earth science>paleoclimate>ice core>atmospheric gas"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2006.xls","linkText":"law2006.xls","urlDescription":"Data","variables":[]}],"dataTableName":"DSS","dataTableNotes":null,"earliestYear":1,"earliestYearBP":1949,"earliestYearCE":1,"mostRecentYear":2004,"mostRecentYearBP":-54,"mostRecentYearCE":2004,"species":[],"timeUnit":"AD"}],"siteName":"Law Dome"}],"studyCode":null,"studyName":"Law Dome Ice Core 2000-Year CO2, CH4, and N2O Data","studyNotes":"Law Dome ice core (DSS, DE08 and DE08-2), firn air (DSSW20K),\nand Cape Grim instrumental (deseasonalised archive, insitu and flask)\nrecords of CO2, CH4 and N2O concentrations for the past 2000 years.\n\nLaw Dome location: The dome summit is as follows, \nindividual cores are within about 25 km (see publications)\n66°44'S, 112°50'E, 1390m elevation.\n\nMeasurement precision for the ice core air samples is 4.1 ppb CH4, \n1.1 ppm CO2, and 6.5 ppb N2O. Measurement precision for the firn air \nsamples is 2 ppb CH4, 0.1 ppm CO2 and 0.3 ppb N2O.\n\nIce core concentrations are adjusted for small system enhancements\n(1.1 ± 0.8 ppm for CO2, 4.1 ± 4.0 ppb for CH4, and 1.8 ± 0.9 ppb for N2O)\nas described in MacFarling Meure et al. (2006) and for the effects of\ngravitational fractionation, also small, as described in Etheridge et al.\n1996, 1998.\n\nAir age spread is 10-12 years for DE08/-2 ice samples, \n18-20 years for DSS ice samples and 5 years for DSSW20K firn air samples. \nSee Trudinger et al., 2002 for statistical definitions.\n\nDE08 and DE08-2 ice core air dating uncertainty is less than +/- 3 years.\nDSS ice core air dating uncertainty is less than +/- 5 years.\n\nDSS ice dating has been revised based on new accumulation rates and\ntemperatures (van Ommen, T., V. Morgan and M.A.J. Curran. 2004.\nDeglacial and Holocene changes in accumulation at Law Dome, East Antarctica,\nAnnals Glaciol., 39, 359-365.; MacFarling Meure 2004).\n\nThe dating of published DSS concentrations have been adjusted by less than\n5 years under the new chronology. \n","version":"1.0","xmlId":"8852"}