Paleo-pCO2 Database ODP668B 2 Million Year Boron Isotope and CO2 Data Hönisch, B.; Hemming, N.G. Hönisch, B. Hemming, N.G. carbon cycle earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (notes,null,null,null,null,climate forcing|climate reconstructions|paleoceanography,null,null,C,reference for composite depth) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (notes,null,null,null,null,climate forcing|climate reconstructions|paleoceanography,null,null,C,type of age uncertainty) earth science/paleoclimate/climate reconstructions|paleoceanography (notes,null,null,null,null,climate reconstructions|paleoceanography,null,null,C,type of temperature uncertainty) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (age,null,null,calendar year before present,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 11B,calcium carbonate,null,per mil SRM 951,null,paleoceanography,averaged,null,N,average of replicates) earth 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951,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,null,null,null,null,paleoceanography,averaged,null,N,average of replicates) earth science/paleoclimate/climate reconstructions|paleoceanography (pH,sea water,two standard deviations upper bound,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (dissolved inorganic carbon,sea water,two standard deviations,micromole per kilogram,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,type of delta 11Bc uncertainty) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (depth,null,null,meter,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,core depth below sea floor) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (latitude,null,null,degree north,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,modern latitude) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (longitude,null,null,degree east,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,modern longitude) earth science/paleoclimate/paleoceanography (delta 11B,null,null,per mil SRM 951,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea water temperature,null,two standard deviations,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,null,null,null,null,paleoceanography,null,null,N,replicates separated by commas) earth science/paleoclimate/climate forcing|paleoceanography (carbon dioxide,sea water,null,parts per million,null,climate forcing|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (dissolved inorganic carbon,sea water,null,micromole per kilogram,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate forcing (ODP668B>LATITUDE 4.77>LONGITUDE -20.93) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hönisch, B. Investigator : Hemming, N.G. 2018-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23473 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.xlsx English https://www.ncdc.noaa.gov/paleo/study/23473 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/honisch2009odp668boron.xlsx Bärbel Hönisch, N. Gary Hemming, David Archer, Mark Siddall, Jerry F. McManus2009Atmospheric Carbon Dioxide Concentration over the Mid-Pleistocene TransitionScience32459341551-155410.1126/science.1171477http://science.sciencemag.org/content/324/5934/1551 Bärbel Hönisch, Gary Hemming2005Surface ocean pH response to variations in pCO2 through two full glacial cyclesEarth and Planetary Science Letters2361-2305-31410.1016/j.epsl.2005.04.027https://www.sciencedirect.com/science/article/pii/S0012821X05002803 START YEAR: 2048189 cal yr BP * END YEAR: 3633 cal yr BP -20.93 4.77 -20.93 4.77