noaa-forcing-23531 Paleo-pCO2 Database Piceance Creek Basin Eocene Nahcolite CO2 Data Jagniecki, E.A.; Lowenstein, T.K.; Jenkins, D.M.; Demicco, R.V. Paleo-pCO2 Database Piceance Creek Basin Eocene Nahcolite CO2 Data 2018-03-08 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23531 Investigator E.A. Jagniecki Investigator T.K. Lowenstein Investigator D.M. Jenkins Investigator R.V. Demicco earth science paleoclimate climate forcing age,null,null,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing age,null,one standard deviation,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing,null,null,N,based on nahcolite earth science paleoclimate climate forcing carbon dioxide geoscientificInformation 51550000 cal yr BP 49320000 cal yr BP Complete 39.90546 39.90546 -108.36224 -108.36224 2000 2000 Continent North America United States Of America Colorado Shell 23x-2>LATITUDE 39.90546>LONGITUDE -108.36224 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 Elliot A. Jagniecki, Tim K. Lowenstein, David M. Jenkins, Robert V. Demicco 2015 Geology 43 12 1075-1078 10.1130/G36886.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/43/12/1075/131750/eocene-atmospheric-co2-from-the-nahcolite-proxy Tim K. Lowenstein, Robert V. Demicco 2006 Science 313 5795 1928 10.1126/science.1129555 http://science.sciencemag.org/content/313/5795/1928

Estimates of the atmospheric concentration of CO2, [CO2]atm, for the "hothouse" climate of the early Eocene climatic optimum (EECO) vary for different proxies. Extensive beds of the mineral nahcolite (NaHCO3) in evaporite deposits of the Green River Formation, Piceance Creek Basin, Colorado, USA, previously established [CO2]atm for the EECO to be >1125 ppm by volume (ppm). Here, we present experimental data that revise the sodium carbonate mineral equilibria as a function of [CO2] and temperature. Co-precipitation of nahcolite and halite (NaCl) now establishes a well-constrained lower [CO2]atm limit of 680 ppm for the EECO. Paleotemperature estimates from leaf fossils and fluid inclusions in halite suggest an upper limit for [CO2]atm in the EECO from the nahcolite proxy of ~1260 ppm. These data support a causal connection between elevated [CO2]atm and early Eocene global warmth, but at significantly lower [CO2]atm than previously thought, which suggests that ancient climates on Earth may have been more sensitive to a doubling of [CO2]atm than is currently assumed. STUDY NOTES: Paleo-CO2 derived from Eocene nahcolite from a Piceance Creek Basin, Colorado sediment core (Green River Formation), contributed to the Paleo-pCO2 Database.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/jagniecki2015nahcolite.txt NOAA Template File; Piceance Creek Basin Eocene Nacolite CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/jagniecki2015nahcolite.xlsx Excel File; Piceance Creek Basin Eocene Nacolite CO2 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11