noaa-forcing-26152 Paleo-pCO2 Database Oligocene/Miocene Stomata CO2 Data Tesfamichael, T.; Royer, D. Paleo-pCO2 Database Oligocene/Miocene Stomata CO2 Data 2019-02-07 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26152 Investigator T. Tesfamichael Investigator D. Royer earth science paleoclimate climate forcing carbon dioxide geoscientificInformation 27260000 cal yr BP 21700000 cal yr BP Complete 12.51 12.51 37.12 37.12 Continent Africa Eastern Africa Ethiopia Chilga>LATITUDE 12.51>LONGITUDE 37.12 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 Tekie Tesfamichael, Bonnie Jacobs, Neil Tabor, Lauren Michel, Ellen Currano, Mulugeta Feseha, Richard Barclay, John Kappelman, Mark Schmitz 2017 Geology 45 11 999-1002 10.1130/G39048.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/45/11/999/516665/settling-the-issue-of-decoupling-between

Recent variations in the concentration of atmospheric carbon dioxide ([CO2]atm) have been shown to affect carbon fixation during photosynthesis and are correlated with anatomical and physiological changes observed in leaves of woody dicots. These include changes in stomatal frequency and size and in d13C values. These attributes can be measured on organically preserved leaf fossils, and therefore can be used as proxies for Earth's atmospheric CO2 history. This study tests the link between [CO2]atm and global temperature for the late Oligocene and early Miocene using fossil leaves collected from Ethiopia, by estimating [CO2]atm using a leaf gas exchange model. The results of this study show a statistically significant [CO2]atm rise from ~390 ppm in the late Oligocene to ~870 ppm in the early Miocene. These values demonstrate a positive correlation between [CO2]atm and global average temperature, contrary to some previous studies for this time interval. The results of this study have important implications for understanding future climate change driven by rising [CO2]atm. STUDY NOTES: Stomata Paleo-CO2 data from Tesfamichael et al. 2017, contributed to the Paleo-pCO2 Database

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.txt NOAA Template File; Oligocene/Miocene Stomata CO2 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.xlsx Excel File; Oligocene/Miocene Stomata CO2 Data USA/NOAA DIF Version 9.8.4 2019-02-15 2019-02-15