Paleo-pCO2 Database Oligocene/Miocene Stomata CO2 Data Tesfamichael, T.; Royer, D. Tesfamichael, T. Royer, D. earth science/paleoclimate/climate forcing (Chilga>LATITUDE 12.51>LONGITUDE 37.12) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Tesfamichael, T. Investigator : Royer, D. 2019-02-07 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26152 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.xlsx English https://www.ncdc.noaa.gov/paleo/study/26152 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tesfamichael2017stomata_franks.xlsx Tekie Tesfamichael, Bonnie Jacobs, Neil Tabor, Lauren Michel, Ellen Currano, Mulugeta Feseha, Richard Barclay, John Kappelman, Mark Schmitz2017Settling the issue of "decoupling" between atmospheric carbon dioxide and global temperature: [CO2]atm reconstructions across the warming Paleogene-Neogene divideGeology4511999-100210.1130/G39048.1https://pubs.geoscienceworld.org/gsa/geology/article-abstract/45/11/999/516665/settling-the-issue-of-decoupling-between START YEAR: 27260000 cal yr BP * END YEAR: 21700000 cal yr BP 37.12 12.51 37.12 12.51