noaa-icecore-20246 WAIS Divide Deep Ice Core 0-68ka WD2014 Chronology Buizert, C.; Sigl, M.; Adolphi, F.; Baggenstos, D.; Bisiaux, M.; Brook, E.J.; Caffee, M.W.; Cheng, H.; Clow, G.D.; Cole-Dai, J.; Cuffey, K.M.; Dunbar, N.W.; Edwards, R.L.; Edwards, R.; Ferris, D.; Fudge, T.J.; Geng, L.; Iverson, N.; Koffman, B.; Layman, L.; Markle, B.R.; Maselli, O.J.; McConnell, J.R.; McGwire, K.; Muscheler, R.; Nishiizumi, K.; Pasteris, D.R.; Rhodes, R.H.; Severinghaus, J.; Sowers, T.; Steig, E.J.; Taylor, K.C.; Welten, K.C.; Winstrup, M.; Woodruff, T.E. WAIS Divide Deep Ice Core 0-68ka WD2014 Chronology 2016-06-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20246 Investigator C. Buizert Investigator M. Sigl Investigator F. Adolphi Investigator D. Baggenstos Investigator M. Bisiaux Investigator E.J. Brook Investigator M.W. Caffee Investigator H. Cheng Investigator G.D. Clow Investigator J. Cole-Dai Investigator K.M. Cuffey Investigator N.W. Dunbar Investigator R.L. Edwards Investigator R. Edwards Investigator D. Ferris Investigator T.J. Fudge Investigator L. Geng Investigator N. Iverson Investigator B. Koffman Investigator L. Layman Investigator B.R. Markle Investigator O.J. Maselli Investigator J.R. McConnell Investigator K. McGwire Investigator R. Muscheler Investigator K. Nishiizumi Investigator D.R. Pasteris Investigator R.H. Rhodes Investigator J. Severinghaus Investigator T. Sowers Investigator E.J. Steig Investigator K.C. Taylor Investigator K.C. Welten Investigator M. Winstrup Investigator T.E. Woodruff earth science paleoclimate ice cores age,null,two standard deviations,year,null,ice cores,null,null,N,gas age-ice age difference (delta age) earth science paleoclimate ice cores ice age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice cores ice age,null,two standard deviations,year,null,ice cores,null,null,N,ice age uncertainty due to CH4 synchronization earth science paleoclimate ice cores age,null,null,year,null,ice cores,null,null,N,gas age-ice age difference (delta age) earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores ice age,null,two standard deviations,year,null,ice cores,null,null,N,ice age uncertainty due to annual layer count earth science paleoclimate ice cores gas age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice cores gas age,null,two standard deviations,year,null,ice cores,null,null,N,null earth science paleoclimate ice core age control geoscientificInformation 67748 cal yr BP -56 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 Sigl, M., Fudge, T.J., Winstrup, M., Cole-Dai, J., Ferris, D., McConnell, J.R., Taylor, K.C., Welten, K.C., Woodruff, T.E., Adolphi, F., Bisiaux, M., Brook, E.J., Buizert, C., Caffee, M.W., Dunbar, N.W., Edwards, R., Geng, L., Iverson, N., Koffman, B., Layman, L., Maselli, O.J., McGwire, K., Muscheler, R., Nishiizumi, K., Pasteris, D.R., Rhodes, R.H. and Sowers, T.A. 2016 Climate of the Past 12 3 769-786 10.5194/cp-12-769-2016 http://www.clim-past.net/12/769/2016/ C. Buizert, K. M. Cuffey, J. P. Severinghaus, D. Baggenstos, T. J. Fudge, E. J. Steig, B. R. Markle, M. Winstrup, R. H. Rhodes, E. J. Brook, T. A. Sowers, G. D. Clow, H. Cheng, R. L. Edwards, M. Sigl, J. R. McConnell, and K. C. Taylor 2015 Climate of the Past 11 2 153-173 10.5194/cp-11-153-2015 http://www.clim-past.net/11/153/2015/cp-11-153-2015.html

The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8-31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age-ice age difference (Delta age) using a combination of firn densification modeling, ice-flow modeling, and a data set of d15N-N2, a proxy for past firn column thickness. The largest Delta age at WD occurs during the Last Glacial Maximum, and is 525 +/- 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard-Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Delta age at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the "bipolar seesaw". STUDY NOTES: The West Antarctic Ice Sheet (WAIS) Divide deep ice core WD2014 chronology, consisting of ice age, gas age, delta-age and uncertainties therein.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/wais-wd2014agemodel.txt Data File; WAIS Divide Deep Ice Core 0-68ka WD2014 Chronology USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11