noaa-forcing-23473 Paleo-pCO2 Database ODP668B 2 Million Year Boron Isotope and CO2 Data Hönisch, B.; Hemming, N.G. Paleo-pCO2 Database ODP668B 2 Million Year Boron Isotope and CO2 Data 2018-03-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23473 Investigator B. Hönisch Investigator N.G. 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climate forcing carbon dioxide geoscientificInformation carbon cycle 2048189 cal yr BP 3633 cal yr BP Complete 4.77 4.77 -20.93 -20.93 -2693 -2693 Ocean Atlantic Ocean North Atlantic Ocean ODP668B>LATITUDE 4.77>LONGITUDE -20.93 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 Bärbel Hönisch, N. Gary Hemming, David Archer, Mark Siddall, Jerry F. McManus 2009 Science 324 5934 1551-1554 10.1126/science.1171477 http://science.sciencemag.org/content/324/5934/1551 Bärbel Hönisch, Gary Hemming 2005 Earth and Planetary Science Letters 236 1-2 305-314 10.1016/j.epsl.2005.04.027 https://www.sciencedirect.com/science/article/pii/S0012821X05002803

The dominant period of Pleistocene glacial cycles changed during the mid-Pleistocene from 40,000 years to 100,000 years, for as yet unknown reasons. Here we present a 2.1-million-year record of sea surface partial pressure of CO2 (Pco2), based on boron isotopes in planktic foraminifer shells, which suggests that the atmospheric partial pressure of CO2 (pco2) was relatively stable before the mid-Pleistocene climate transition. Glacial Pco2 was ~31 microatmospheres higher before the transition (more than 1 million years ago), but interglacial Pco2 was similar to that of late Pleistocene interglacial cycles (<450,000 years ago). These estimates are consistent with a close linkage between atmospheric CO2 concentration and global climate, but the lack of a gradual decrease in interglacial Pco2 does not support the suggestion that a long-term drawdown of atmospheric CO2 was the main cause of the climate transition. STUDY NOTES: Paleo-CO2 derived from boron isotope measurements on marine sediment core ODP668B for the past 2 million years, contributed to the Paleo-pCO2 Database

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.txt NOAA Template File; ODP668B Boron Isotope and CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.xlsx Excel File; ODP668B Boron Isotope and CO2 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11