noaa-icecore-18636 WAIS Divide Ice Core 9-23KYrBP CO2 Data Marcott, S.A.; Bauska, T.K.; Buizert, C.; Steig, E.J.; Rosen, J.; Cuffey, K.M.; Fudge, T.J.; Severinghaus, J.; Ahn, J.; Kalk, M.L.; McConnell, J.R.; Sowers, T.; Taylor, K.C.; White, J.W.C.; Brook, E.J. WAIS Divide Ice Core 9-23KYrBP CO2 Data 2015-05-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18636 Investigator S.A. Marcott Investigator T.K. Bauska Investigator C. Buizert Investigator E.J. Steig Investigator J. Rosen Investigator K.M. Cuffey Investigator T.J. Fudge Investigator J. Severinghaus Investigator J. Ahn Investigator M.L. Kalk Investigator J.R. McConnell Investigator T. Sowers Investigator K.C. Taylor Investigator J.W.C. White Investigator E.J. Brook earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,corrected,gas chromatography - flame ionization detection,N,WMOX2007 scale for CO2; corrected for gravitational fractionation earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice core atmospheric gas geoscientificInformation carbon cycle 23030 cal yr BP 8893 cal yr BP Complete -79.4676 -79.4676 -112.0865 -112.0865 1806 1806 Continent Antarctica WAIS Divide WDC06A>LATITUDE -79.4676>LONGITUDE -112.0865 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

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Boulder CO 80305-3328 USA online ASCII Shaun A. Marcott, Thomas K. Bauska, Christo Buizert, Eric J. Steig, Julia L. Rosen, Kurt M. Cuffey, T.J. Fudge, Jeffery P. Severinghaus, Jinho Ahn, Michael L. Kalk, Joseph R. McConnell, Todd Sowers, Kendrick C. Taylor, James W.C. White, and Edward J. Brook 2014 Nature 515 7524 616-619 10.1038/nature13799 http://www.nature.com/nature/journal/v514/n7524/full/nature13799.html

Global climate and the concentration of atmospheric carbon dioxide (CO2) are correlated over recent glacial cycles. The combination of processes responsible for a rise in atmospheric CO2 at the last glacial termination (23,000 to 9,000 years ago), however, remains uncertain. Establishing the timing and rate of CO2 changes in the past provides critical insight into the mechanisms that influence the carbon cycle and helps put present and future anthropogenic emissions in context. Here we present CO2 and methane (CH4) records of the last deglaciation from a new high-accumulation West Antarctic ice core with unprecedented temporal resolution and precise chronology. We show that although low-frequency CO2 variations parallel changes in Antarctic temperature, abrupt CO2 changes occur that have a clear relationship with abrupt climate changes in the Northern Hemisphere. A significant proportion of the direct radiative forcing associated with the rise in atmospheric CO2 occurred in three sudden steps, each of 10 to 15 parts per million. Every step took place in less than two centuries and was followed by no notable change in atmospheric CO2 for about 1,000 to 1,500 years. Slow, millennial-scale ventilation of Southern Ocean CO2-rich, deep-ocean water masses is thought to have been fundamental to the rise in atmospheric CO2 associated with the glacial termination, given the strong covariance of CO2 levels and Antarctic temperatures. Our data establish a contribution from an abrupt, centennial-scale mode of CO2 variability that is not directly related to Antarctic temperature. We suggest that processes operating on centennial timescales, probably involving the Atlantic meridional overturning circulation, seem to be influencing global carbon-cycle dynamics and are at present not widely considered in Earth system models. STUDY NOTES: Atmospheric Carbon Dioxide (CO2) concentration data from WAIS ice cores for the period 23,000 to 9,000 years before present.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/wais2014co2.txt Data File; WAIS Divide 9-23KYrBP CO2 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11