noaa-icecore-13139 Byrd and Siple Dome 9-21 ka CO2 data on GICC05 Timescale Pedro, J.B.; Rasmussen, S.O.; van Ommen, T.D. Byrd and Siple Dome 9-21 ka CO2 data on GICC05 Timescale 2012-07-24 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/13139 Investigator J.B. Pedro Investigator S.O. Rasmussen Investigator T.D. van Ommen earth science paleoclimate climate forcing|ice cores carbon dioxide,bulk atmosphere,one standard deviation,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,null,null,N,null 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 21328 cal yr BP 8580 cal yr BP Complete -81.65 -80.02 -148.82 -119.52 621 1530 Continent Antarctica Siple Dome>LATITUDE -81.65>LONGITUDE -148.82 Continent Antarctica Byrd>LATITUDE -80.02>LONGITUDE -119.52 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 Pedro, J.B., S.O. Rasmussen, and T.D. van Ommen. 2012. Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation. Clim. Past, 8, 1213-1221. www.clim-past.net/8/1213/2012/ doi:10.5194/cp-8-1213-2012

Antarctic ice cores provide clear evidence of a close coupling between variations in Antarctic temperature and the atmospheric concentration of CO2 during the glacial/interglacial cycles of at least the past 800-thousand years. Precise information on the relative timing of the temperature and CO2 changes can assist in refining our understanding of the physical processes involved in this coupling. Here, we focus on the last deglaciation, 19 000 to 11 000 yr before present, during which CO2 concentrations increased by ~80 parts per million by volume and Antarctic temperature increased by ~10°C. Utilising a recently developed proxy for regional Antarctic temperature, derived from five near-coastal ice cores and two ice core CO2 records with high dating precision, we show that the increase in CO2 likely lagged the increase in regional Antarctic temperature by less than 400 yr and that even a short lead of CO2 over temperature cannot be excluded. This result, consistent for both CO2 records, implies a faster coupling between temperature and CO2 than previous estimates, which had permitted up to millennial-scale lags. STUDY NOTES: CO2 data from the Byrd and Siple Dome ice cores placed on the Greenland Ice Core Chronology 2005 (GICC05) timescale for 9 - 21 KYrBP. The regional Antarctic temperature proxy data series is available elsewhere: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/antarctica2011iso.txt The locations and original references for the CO2 data and transfers to the GICC05 timescale are as follows: Byrd Location: 80°01’S 119°31’W Elevation: 1530 m asl Reference for transfer to GICC05 timescale: Pedro et al., Clim. Past. 8, 2012. Reference for CO2 data: (1) Neftel, A., Oeschger, H., Staffelbach, T., and Nature, 331, 609–611, doi:10.1038/331609a0, 1988. (2) Staffelbach, T., Stauffer, B., Sigg, A., and Oeschger, H.: CO2 measurements from polar ice cores – More data from different sites, Tellus B, 43, 91–96, doi:10.1034/j.1600-0889.1991.t01-1- 00003.x, 1991. Siple Dome Location: 81° 40'S 148° 49'W Elevation: 621 m asl Reference for transfer to GICC05 timescale: Pedro et al., Clim. Past. 8, 2012. Reference for CO2 data: Ahn, J., Wahlen, M., Deck, B. L., Brook, E. J., Mayewski, P. A., Taylor, K. C., and White, J. W. C.: A record of atmospheric CO2 during the last 40,000 years from the Siple Dome, Antarctica ice core, J. Geophys. Res., 109, D13305, doi:10.1029/2003JD004415, 2004. Byrd Ice Core: 80.01°S , 119.51°W; 1530 m elev. Siple Dome Ice Core, West Antarctica: 81°40'S, 148°49'W

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/byrd/byrd-siple2012co2.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/byrd/byrd-siple2012co2.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11