noaa-forcing-23590 Paleo-pCO2 Database ODP999 4.6 Million Year Boron Isotope and CO2 Data Bartoli, G.; Hönisch, B.; Zeebe, R.E. Paleo-pCO2 Database ODP999 4.6 Million Year Boron Isotope and CO2 Data 2018-03-10 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23590 Investigator G. Bartoli Investigator B. Hönisch Investigator R.E. Zeebe earth science paleoclimate climate reconstructions|paleoceanography pH,delta 11B,null,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 11B,Trilobatus sacculifer,null,per mil,null,paleoceanography,null,thermal ionization mass spectrometry,N,N-TIMS earth science paleoclimate climate forcing|climate reconstructions|paleoceanography age,null,null,million years ago,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate forcing|climate reconstructions|paleoceanography age,null,two standard deviations,null,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 11B,Trilobatus sacculifer,two standard deviations,per mil,null,paleoceanography,null,thermal ionization mass spectrometry,N,N-TIMS earth science paleoclimate climate forcing|paleoceanography carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|paleoceanography,null,null,N,based on planktic foram delta 11B earth science paleoclimate climate forcing|paleoceanography carbon dioxide,bulk atmosphere,two standard deviations lower bound,parts per million,null,climate forcing|paleoceanography,null,null,N,based on planktic foram delta 11B earth science paleoclimate climate reconstructions|paleoceanography pH,delta 11B,two standard deviations upper bound,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate forcing|paleoceanography carbon dioxide,bulk atmosphere,two standard deviations upper bound,parts per million,null,climate forcing|paleoceanography,null,null,N,based on planktic foram delta 11B earth science paleoclimate climate reconstructions|paleoceanography pH,delta 11B,two standard deviations lower bound,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate forcing carbon dioxide geoscientificInformation 4580295 cal yr BP 1975132 cal yr BP Complete 12.75 12.75 -78.73 -78.73 -2827 -2827 Ocean Pacific Ocean North Pacific Ocean ODP 999A>LATITUDE 12.75>LONGITUDE -78.73 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 Gretta Bartoli, Bärbel Hönisch, Richard E. Zeebe 2011 Paleoceanography 26 4 10.1029/2010PA002055 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2010PA002055

Several hypotheses have been put forward to explain the onset of intensive glaciations on Greenland, Scandinavia, and North America during the Pliocene epoch between 3.6 and 2.7 million years ago (Ma). A decrease in atmospheric CO2 may have played a role during the onset of glaciations, but other tectonic and oceanic events occurring at the same time may have played a part as well. Here we present detailed atmospheric CO2 estimates from boron isotopes in planktic foraminifer shells spanning 4.6-2.0 Ma. Maximal Pliocene atmospheric CO2 estimates gradually declined from values around 410 uatm to early Pleistocene values of 300 uatm at 2.0 Ma. After the onset of large-scale ice sheets in the Northern Hemisphere, maximal pCO2 estimates were still at 2.5 Ma +90 uatm higher than values characteristic of the early Pleistocene interglacials. By contrast, Pliocene minimal atmospheric CO2 gradually decreased from 310 to 245 uatm at 3.2 Ma, coinciding with the start of transient glaciations on Greenland. Values characteristic of early Pleistocene glacial atmospheric CO2 of 200 uatm were abruptly reached after 2.7 Ma during the late Pliocene transition. This trend is consistent with the suggestion that ocean stratification and iron fertilization increased after 2.7 Ma in the North Pacific and Southern Ocean and may have led to increased glacial CO2 storage in the oceanic abyss after 2.7 Ma onward. STUDY NOTES: Paleo-CO2 derived from boron isotope measurements on marine sediment core ODP999A for the past 4.6 million years, contributed to the Paleo-pCO2 Database

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/bartoli2011odp999boron.xlsx Excel File; ODP999 Boron Isotope and CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/bartoli2011odp999boron.txt NOAA Template File; ODP999 Boron Isotope and CO2 Data USA/NOAA DIF Version 9.8.4 2019-06-07 2019-06-07