noaa-forcing-23250 Paleo-pCO2 Database Early Cenozoic Liverwort-Bryocarb CO2 Data Royer, D. Paleo-pCO2 Database Early Cenozoic Liverwort-Bryocarb CO2 Data 2017-12-17 NCDC-Paleoclimatology ONLINE Files 10.7289/V5KP80DP https://www.ncdc.noaa.gov/paleo/study/23250 Investigator D. Royer earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,stratigraphic level earth science paleoclimate climate forcing sample identification,null,null,null,null,climate forcing,null,null,C,sample name earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,sample repository earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,how was age determined earth science paleoclimate climate forcing age,null,null,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing longitude,null,null,degree east,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,person who entered data earth science paleoclimate climate forcing carbon dioxide,null,unspecified error lower bound,parts per million,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,family earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,geologic formation earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,CO2 type earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,what is the uncertainty range? earth science paleoclimate climate forcing age,null,unspecified error upper bound,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,date of data entry earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,genus earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,age scale earth science paleoclimate climate forcing carbon dioxide,null,unspecified error upper bound,parts per million,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,species earth science paleoclimate climate forcing age,null,unspecified error lower bound,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,general notes earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,doi earth science paleoclimate climate forcing carbon dioxide,null,null,parts per million,null,climate forcing,null,null,N,reported mean CO2 earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,citation earth science paleoclimate climate forcing notes,null,null,null,null,climate forcing,null,null,C,what is the distribution of uncertainties? earth science paleoclimate climate forcing latitude,null,null,degree north,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing carbon dioxide geoscientificInformation 58400000 cal yr BP 51900000 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>LATITUDE >LONGITUDE 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 Benjamin J. Fletcher, Stuart J. Brentnall, Clive W. Anderson, Robert A. Berner, David J. Beerling 2008 Nature Geoscience 1 43-48 10.1038/ngeo.2007.29 https://www.nature.com/articles/ngeo.2007.29 D.L. ROYER, M. PAGANI and D.J. BEERLING 2012 Geobiology 10 4 298-310 10.1111/j.1472-4669.2012.00320.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1472-4669.2012.00320.x/abstract

The relationship between atmospheric carbon dioxide (CO2) and climate in the Quaternary period has been extensively investigated, but the role of CO2 in temperature changes during the rest of Earth's history is less clear. The range of geological evidence for cool periods during the high CO2 Mesozoic 'greenhouse world' of high atmospheric CO2 concentrations, indicated by models and fossil soils, has been particularly difficult to interpret. Here, we present high-resolution records of Mesozoic and early Cenozoic atmospheric CO2 concentrations from a combination of carbon-isotope analyses of non-vascular plant (bryophyte) fossils and theoretical modelling. These records indicate that atmospheric CO2 rose from ~420 p.p.m.v. in the Triassic period (about 200 million years ago) to a peak of ~1,130 p.p.m.v. in the Middle Cretaceous (about 100 million years ago). Atmospheric CO2 levels then declined to ~680 p.p.m.v. by 60 million years ago. Time-series comparisons show that these variations coincide with large Mesozoic climate shifts, in contrast to earlier suggestions of climate-CO2 decoupling during this interval. These reconstructed atmospheric CO2 concentrations drop below the simulated threshold for the initiation of glaciations on several occasions and therefore help explain the occurrence of cold intervals in a 'greenhouse world'. STUDY NOTES: Liverwort-Bryocarb paleo-CO2 data from Fletcher et al. 2008 and Royer et al. 2012 contributed to the Paleo-pCO2 Database.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/fletcher2008liverwort.xlsx Excel Data File; Early Cenozoic Liverwort-Bryocarb CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/fletcher2008liverwort.txt NOAA Template File; Early Cenozoic Liverwort-Bryocarb CO2 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11