noaa-icecore-17975 Antarctic Ice Cores Revised 800KYr CO2 Data Bereiter, B.; Eggleston, S.; Schmitt, J.; Nehrbass-Ahles, C.; Stocker, T.F.; Fischer, H.; Kipfstuhl, S.; Chappellaz, J.A. Antarctic Ice Cores Revised 800KYr CO2 Data 2015-02-04 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17975 Investigator B. Bereiter Investigator S. Eggleston Investigator J. Schmitt Investigator C. Nehrbass-Ahles Investigator T.F. Stocker Investigator H. Fischer Investigator S. Kipfstuhl Investigator J.A. Chappellaz earth science paleoclimate ice cores notes,null,null,null,null,ice cores,null,null,C,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,one standard deviation,parts per million,null,climate forcing|ice cores,composited|corrected,null,N,null earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,AICC2012 earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,EDML1 Sz4 earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,corrected,null,N,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,two standard deviations lower bound,parts per million,null,climate forcing|ice cores,null,null,N,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,composited|corrected,null,N,null earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,TALDICE-1a earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,EDC3 earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,one standard deviation,parts per million,null,climate forcing|ice cores,corrected,null,N,null earth science paleoclimate ice cores gas age,null,unspecified margin of error,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,null,null,N,correcting factor earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,Ahn2008 earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,two standard deviations upper bound,parts per million,null,climate forcing|ice cores,null,null,N,null earth science paleoclimate ice core atmospheric gas geoscientificInformation 805668 cal yr BP -51 cal yr BP Complete -81.65 -66.73 -148.82 159.1833 621 3240 Continent Antarctica Talos Dome TALDICE>LATITUDE -72.8166>LONGITUDE 159.1833 Continent Antarctica WAIS Divide WDC06A>LATITUDE -79.4676>LONGITUDE -112.0865 Continent Antarctica EPICA Dome C>LATITUDE -75.1>LONGITUDE 123.4 Continent Antarctica Vostok>LATITUDE -78.47>LONGITUDE 106.8 Continent Antarctica Siple Dome>LATITUDE -81.65>LONGITUDE -148.82 Continent Antarctica EPICA Dronning Maud Land>LATITUDE -75>LONGITUDE .07 Continent Antarctica Law Dome>LATITUDE -66.73>LONGITUDE 112.83 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Bernhard Bereiter, Sarah Eggleston, Jochen Schmitt, Christoph Nehrbass-Ahles, Thomas F. Stocker, Hubertus Fischer, Sepp Kipfstuhl and Jerome Chappellaz 2015 Geophysical Research Letters 10.1002/2014GL061957 http://onlinelibrary.wiley.com/doi/10.1002/2014GL061957/abstract Dieter Lüthi, Martine Le Floch, Bernhard Bereiter, Thomas Blunier, Jean-Marc Barnola, Urs Siegenthaler, Dominique Raynaud, Jean Jouzel, Hubertus Fischer, Kenji Kawamura, and Thomas F. Stocker 2008 Nature 453 379-382 10.1038/nature06949 http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html

The European Project for Ice Coring in Antarctica Dome ice core from Dome C (EDC) has allowed for the reconstruction of atmospheric CO2 concentrations for the last 800,000 years. Here we revisit the oldest part of the EDC CO2 record using different air extraction methods and sections of the core. For our established cracker system, we found an analytical artifact, which increases over the deepest 200 m and reaches 10.1 +/- 2.4 ppm in the oldest/deepest part. The governing mechanism is not yet fully understood, but it is related to insufficient gas extraction in combination with ice relaxation during storage and ice structure. The corrected record presented here resolves partly - but not completely - the issue with a different correlation between CO2 and Antarctic temperatures found in this oldest part of the records. In addition, we provide here an update of 800,000 years atmospheric CO2 history including recent studies covering the last glacial cycle. STUDY NOTES: Revised EPICA Dome C and Antarctic composite ice core atmospheric CO2 data. This new version of CO2 composite replaces the old version of Luthi et al. (2008), which contains the analytical bias described in Bereiter et al. 2015 and lower quality data in other sections.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2composite.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2domec.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Dome C GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2byrd.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Byrd GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2edml.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - EPICA Dronning Maud Land GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2vostok.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Vostok GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2wais.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - WAIS GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2lawsp.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Law Dome/South Pole GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2taylor.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Taylor Dome GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2law.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Law Dome GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2siple.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Siple Dome GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2.xls Excel Data File; Antarctic Ice Core Revised Composite and Indivdual Core CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2edc.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - EPICA Dome C GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2015co2talos.txt Text Data File; Antarctic Ice Core Revised Composite CO2 Data - Talos Dome USA/NOAA DIF Version 9.8.4 2019-05-06 2019-05-06