Paleo-pCO2 Database Franks Method Stomata CO2 Data Reichgelt, T.; D'Andrea, W.J.; Fox, B.R.S. Reichgelt, T. D'Andrea, W.J. Fox, B.R.S. earth science/paleoclimate/climate forcing (age,null,null,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 stomatal density) earth science/paleoclimate/climate forcing (Foulden Maar Diatomite>LATITUDE -45.53>LONGITUDE 170.22) A rise in atmospheric CO2 is believed to be necessary for the termination of large-scale glaciations. Although the Antarctic Ice Sheet is estimated to have melted from ~125% to ~50% its modern size, there is thus far no evidence for an increase in atmospheric CO2 associated with the Mi-1 glacial termination in the earliest Miocene. Here, we present evidence from a high-resolution terrestrial record of leaf physiological change in southern New Zealand for an abrupt increase in atmospheric CO2 coincident with the termination of the Mi-1 glaciation and lasting approximately 20 kyr. Quantitative pCO2 estimates, made using a leaf gas exchange model, suggest that atmospheric CO2 levels may have doubled during this period, from 516+/- 111 ppm to 1144+/-410 ppm, and subsequently returned back to 425 +/- 53 ppm. The 20-kyr interval with high pCO2 estimates is also associated with a period of increased moisture supply to southern New Zealand, inferred from carbon and hydrogen isotopes of terrestrial leaf waxes. The results provide the first high-resolution record of terrestrial environmental change at the Oligocene/Miocene boundary, document a ~20 kyr interval of elevated pCO2 and increased local moisture availability, and provide insight into ecosystem response to a major orbitally driven climatic transition. STUDY NOTES: Paleo-CO2 derived from fossil plant stomata utilizing the Franks method, contributed to the Paleo-pCO2 Database. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Reichgelt, T. Investigator : D'Andrea, W.J. Investigator : Fox, B.R.S. 2018-03-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23711 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.txt English https://www.ncdc.noaa.gov/paleo/study/23711 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/reichgelt2016stomata.txt Tammo Reichgelt, William J. D'Andrea, Bethany R.S. Fox2016Abrupt plant physiological changes in southern New Zealand at the termination of the Mi-1 event reflect shifts in hydroclimate and pCO2Earth and Planetary Science Letters455115-12410.1016/j.epsl.2016.09.026https://www.sciencedirect.com/science/article/pii/S0012821X16305064 START YEAR: 23030000 cal yr BP * END YEAR: 22984000 cal yr BP 170.22 -45.53 170.22 -45.53