PP027
Towards a CO2 ‘Keeling Curve’ for Geologic Time
Session ID#: 160681
Session Description:
Confident knowledge of past atmospheric CO2 concentrations is fundamental to understanding the drivers of past climates, evolutionary transitions and extinctions, as well as the sensitivity of our climate system to past, present, and future carbon emissions. Coordinated efforts made over the past few years have enhanced the scientific exchange between researchers working on proxy-based reconstructions of paleo-CO2, led to the development of a dedicated database, vetted published data, streamlined calculation routines, and launched initiatives to generate new data and modernize outdated records. Further development, application, and comparison of different proxy estimates remains essential to improve these reconstructions and establish a fully rigorous and reliable record of paleo-CO2. We encourage submissions that advance our understanding of global carbon cycle changes throughout the Phanerozoic, including new and revised paleo-CO2 estimates, methodological improvements in data assessment and modeling, multi-proxy application and comparison, estimates of climate sensitivity, and evaluation of changes in boundary conditions.
Index Terms:
1610 Atmosphere [GLOBAL CHANGE]
4924 Geochemical tracers [PALEOCEANOGRAPHY]
4928 Global climate models [PALEOCEANOGRAPHY]
4930 Greenhouse gases [PALEOCEANOGRAPHY]
Primary Convener: Baerbel Hoenisch, Columbia University of New York, Palisades, NY, United States
Conveners: Andy Ridgwell, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, Isabel P Montanez, Univ of California, Davis, Earth and Planetary Sciences, Davis, CA, United States and Gabriel J Bowen, University of Utah, Salt Lake City, UT, United States
Increased biogenic calcification and accumulation under elevated pCO2 during the Miocene: a model-data comparison (1074279)
Weimin Si1, Timothy Herbert2, Mengxi Wu2 and Yair Rosenthal3, (1)Brown University, DEEPS, Providence, RI, United States, (2)Brown University, Earth, Environmental and Planetary Sciences, Providence, RI, United States, (3)Rutgers University, Department of Marine and Coastal Sciences, New Brunswick, NJ, United States
Atmospheric CO2 During the Last 540 Million Years (1087707)
Christopher Scotese, Northwestern University, Evanston, IL, United States, Dana L Royer, Wesleyan University, Department of Earth and Environmental Sciences, Middletown, CT, United States, Colin P Summerhayes, University of Cambridge, Cambridge, United Kingdom and Benjamin Mills, University of Leeds, Leeds, United Kingdom
Global Analysis of Ginkgo biloba Stomatal Frequencies and other Key Traits shows no Influence by Climate, indicating that the Stomatal Paleo-pCO2 Proxy is Robust. (Invited) (1105917)
Margret Steinthorsdottir1, Phillip E. Jardine2, Barry H Lomax3 and Therese Sallstedt1, (1)Swedish Museum of Natural History, Stockholm, Sweden, (2)University of Münster, Institute of Geology and Palaeontology, Münster, Germany, (3)University of Nottingham, Nottingham, United Kingdom
The first continuous pCO2 record for the Early Cretaceous. (1119974)
Olivia Graham, University of Bristol, Organic Geochemistry Unit, Bristol, BS8, United Kingdom, Katie McQue, University of Bristol, Bristol, United Kingdom, Caitlyn Witkowski, University of Bristol, Bristol, BS8, United Kingdom and Bernhard David Naafs, University of Bristol, Department of Earth Sciences & Department of Chemistry, Bristol, United Kingdom
Seven Years on the Ginkgo Farm: Implications of an Elevated CO2 Growth Experiment for Reconstructing paleo-pCO2 from a “Living Fossil” (1127631)
Richard S Barclay, National Museum of Natural History, Paleobiology, Washington, United States, Scott L Wing, National Museum of Natural History, Smithsonian Institution, Paleobiology, Washington, DC, United States, Jonathan P Wilson, Haverford College, Haverford, PA, United States, Patrick Megonigal, Smithsonian Environmental Research Center, Edgewater, United States and Mason Scher, National Museum of Natural History, Washington, DC, United States
Recent Developments and Future Directions in Phytoplankton-based Records of Cenozoic pCO2 (Invited) (1128834)
Pratigya J Polissar, University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, Ann Pearson, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, Caitlyn Witkowski, University of Bristol, Bristol, BS8, United Kingdom, Heather M Stoll, ETH Zurich, Zurich, Switzerland, Yige Zhang, Texas A&M University, Department of Oceanography, College Station, United States, Clara T Bolton, Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix en Provence, France, Marcus Peter Sebastian Badger, Open University, Milton Keynes, United Kingdom, Elise Wilkes, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, United States and Samuel R Phelps, Harvard University, Earth and Planetary Sciences, Cambridge, United States
Comparing the boron isotope proxy for atmospheric CO2 in two species of planktic foraminifera across the late Neogene (1164569)
Lloyd Bruce Anderson1, Baerbel Hoenisch1, Pratigya J Polissar2 and Samuel R. Phelps1, (1)Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States, (2)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States
Refining the alkenone-pCO2 method: constraining algal physiology using Bayesian inference (1173143)
Xiaoqing Liu1, Shuang Zhang1, Xiaobo Jin2, Mariem Saavedra-Pellitero3, Jorijntje Henderiks4, Tom Dunkley Jones3, Chuanlian Liu2 and Yige Zhang1, (1)Texas A&M University, Department of Oceanography, College Station, United States, (2)Tongji University, State Key Laboratory of Marine Geology, Shanghai, China, (3)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom, (4)Uppsala University, Department of Earth Sciences, Uppsala, Sweden
Can the depth-dependent characteristics of sedimentary CaCO3 preservation help constrain past pCO2? (1184137)
Andy Ridgwell, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, Markus Adloff, University of Bern, Climate and Environmental Physics (KUP), Bern, Switzerland and Sarah E. Greene, University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, B15, United Kingdom
