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Settling the issue of "decoupling" between atmospheric carbon dioxide and global temperature; [CO (sub 2) ] (sub atm) reconstructions across the warming Paleogene-Neogene divide

Tekie Tesfamichael, Bonnie Jacobs, Neil Tabor, Lauren Michel, Ellen Currano, Mulugeta Feseha, Richard Barclay, John Kappelman and Mark Schmitz
Settling the issue of "decoupling" between atmospheric carbon dioxide and global temperature; [CO (sub 2) ] (sub atm) reconstructions across the warming Paleogene-Neogene divide
Geology (Boulder) (November 2017) 45 (11): 999-1002

Abstract

Recent variations in the concentration of atmospheric carbon dioxide ([CO (sub 2) ]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 delta (super 13) C values. These attributes can be measured on organically preserved leaf fossils, and therefore can be used as proxies for Earth's atmospheric CO (sub 2) history. This study tests the link between [CO (sub 2) ]atm and global temperature for the late Oligocene and early Miocene using fossil leaves collected from Ethiopia, by estimating [CO (sub 2) ]atm using a leaf gas exchange model. The results of this study show a statistically significant [CO (sub 2) ]atm rise from approximately 390 ppm in the late Oligocene to approximately 870 ppm in the early Miocene. These values demonstrate a positive correlation between [CO (sub 2) ]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 [CO (sub 2) ]atm.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 45
Serial Issue: 11
Title: Settling the issue of "decoupling" between atmospheric carbon dioxide and global temperature; [CO (sub 2) ] (sub atm) reconstructions across the warming Paleogene-Neogene divide
Affiliation: Southern Methodist University, Roy M. Huffington Department of Earth Sciences, Dallas, TX, United States
Pages: 999-1002
Published: 201711
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2018-024420
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2017337
Illustration Description: illus. incl. 1 table, sketch map
N04°16'60" - N05°00'00", E36°00'00" - E40°00'00"
Secondary Affiliation: University of Wyoming, USA, United StatesAddis Ababa University, ETH, EthiopiaNational Museum of Natural History, USA, United StatesUniversity of Texas at Austin, USA, United StatesBoise State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201806
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