noaa-ocean-15695 Reconstructed pCO2 Data Estimated from Regional d13C Gradients Over Last 1.5Ma Lisiecki, L.E. Reconstructed pCO2 Data Estimated from Regional d13C Gradients Over Last 1.5Ma 2013-12-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/15695 Investigator L.E. Lisiecki earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate climate forcing carbon dioxide,null,null,parts per million,null,climate forcing,null,null,N,estimated from Ddelta 13C_PDW-NA/2 earth science paleoclimate paleocean reconstruction geoscientificInformation 1500000 cal yr BP 0 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>LATITUDE >LONGITUDE 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 Lisiecki, L.E. 2010 Geophysical Research Letters 37 L21708 10.1029/2010GL045109

A high-resolution marine proxy for atmospheric pCO2 is needed to clarify the phase lag between pCO2 and marine climate proxies and to provide a record of orbital-scale pCO2 variations before the oldest ice core measurement at 800 ka. Benthic d13C data should record deep ocean carbon storage and, thus, atmospheric pCO2. This study finds that a modified d13C gradient between the deep Pacific and intermediate North Atlantic (Dd13CP-NA/2) correlates well with pCO2. Dd13CP-NA/2 reproduces characteristic differences between pCO2 and ice volume during Late Pleistocene glaciations and indicates that pCO2 usually leads terminations by 0.2-3.7 kyr but lags by 3-10 kyr during two failed terminations at 535 and 745 ka. Dd13CP-NA/2 gradually transitions from 41- to 100-kyr cyclicity from 1.3-0.7 Ma but has no secular trend in mean or amplitude since 1.5 Ma. The minimum pCO2 of the last 1.5 Myr is estimated to be 155 ppm at 920 ka. STUDY NOTES: Dd13CP-NA/2 is calculated as the difference between regional stacks of benthic d13c on the LR04 benthic d18O age model (Lisiecki and Raymo, 2005). More precisely, Dd13CP-NA/2 is deep Pacific d13c minus 0.5 times the intermediate-depth North Atlantic d13c, scaled to the mean and standard deviation of ice core pCO2 from 0-800 ka. For stack data, see Lisiecki (2010), A simple mixing explanation for late Pleistocene changes in the Pacific-South Atlantic benthic d13C gradient, Clim. Past, 6, 305-314.

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