Paleo-pCO2 Database ODP999 5 Million Year Boron Isotope and CO2 Data Seki, O.; Foster, G.L.; Schmidt, D.N.; Mackensen, A.; Kawamura, K.; Pancost, R.D. Seki, O. Foster, G.L. Schmidt, D.N. Mackensen, A. Kawamura, K. Pancost, R.D. earth science/paleoclimate/climate forcing (ODP 999A>LATITUDE 12.75>LONGITUDE -78.73) The Pliocene period is the most recent time when the Earth was globally significantly (~3C) warmer than today. However, the existing pCO2 data for the Pliocene are sparse and there is little agreement between the various techniques used to reconstruct palaeo-pCO2. This disagreement, coupled with the general low temporal resolution of the published records, does not allow a robust assessment of the role of declining pCO2 in the intensification of the Northern Hemisphere Glaciation (INHG) and a direct comparison to other proxy records are lacking. For the first time, we use a combination of foraminiferal (d11B) and organic biomarker (alkenone-derived carbon isotopes) proxies to determine the concentration of atmospheric CO2 over the past 5 Ma. Both proxy records show that during the warm Pliocene pCO2 was between 330 and 400 ppm, i.e. similar to today. The decrease to values similar to pre-industrial times (275-285 ppm) occurred between 3.2 Ma and 2.8 Ma - coincident with the INHG and affirming the link between global climate, the cryosphere and pCO2. STUDY NOTES: Paleo-CO2 derived from boron isotope measurements on marine sediment core ODP999A for the past 4 million years, contributed to the Paleo-pCO2 Database NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Seki, O. Investigator : Foster, G.L. Investigator : Schmidt, D.N. Investigator : Mackensen, A. Investigator : Kawamura, K. Investigator : Pancost, R.D. 2019-02-09 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26091 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.xlsx English https://www.ncdc.noaa.gov/paleo/study/26091 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/seki2010odp999boron.xlsx Osamu Seki, Gavin L. Foster, Daniela N. Schmidt, Andreas Mackensen, Kimitaka Kawamura, Richard D. Pancost2010Alkenone and boron-based Pliocene pCO2 recordsEarth and Planetary Science Letters2921-2201-21110.1016/j.epsl.2010.01.037https://www.sciencedirect.com/science/article/pii/S0012821X10000816 START YEAR: 4342000 cal yr BP * END YEAR: 4000 cal yr BP -78.73 12.75 -78.73 12.75