A 23 m.y. record of low atmospheric CO2
Current atmospheric CO2 concentration is known to be higher than it has been during the past ∼800 k.y. of Earth history, based on direct measurement of CO2 within ice cores. A comparison to the more ancient past is complicated by a deficit of CO2 proxies that may be applied across very long spans of...
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| Veröffentlicht in: | Geology (Boulder) 2020-09, Vol.48 (9), p.888-892 |
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| creator | Cui, Ying Schubert, Brian A Jahren, A. Hope |
| description | Current atmospheric CO2 concentration is known to be higher than it has been during the past ∼800 k.y. of Earth history, based on direct measurement of CO2 within ice cores. A comparison to the more ancient past is complicated by a deficit of CO2 proxies that may be applied across very long spans of geologic time. Here, we present a new CO2 record across the past 23 m.y. of Earth history based on the δ13C value of terrestrial C3 plant remains, using a method applicable to the entire ∼400 m.y. history of C3 photosynthesis on land. Across the past 23 m.y., CO2 likely ranged between ∼230 ppmv and 350 ppmv (68% confidence interval: ∼170-540 ppm). CO2 was found to be highest during the early and middle Miocene and likely below present-day levels during the middle Pliocene (84th percentile: ∼400 ppmv). These data suggest present-day CO2 (412 ppmv) exceeds the highest levels that Earth experienced at least since the Miocene, further highlighting the present-day disruption of long-established CO2 trends within Earth's atmosphere. |
| doi_str_mv | 10.1130/G47681.1 |
| format | Article |
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| ispartof | Geology (Boulder), 2020-09, Vol.48 (9), p.888-892 |
| issn | 0091-7613 1943-2682 |
| language | eng |
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| source | NORA - Norwegian Open Research Archives |
| subjects | aliphatic hydrocarbons alkanes atmosphere C-13/C-12 carbon Carbon dioxide Carbon dioxide atmospheric concentrations Carbon dioxide concentration Carbon dioxide measurements Cenozoic Confidence intervals Cores Earth Earth atmosphere Earth history ecosystems Geochemistry Geological time Geology hydrocarbons Ice cores isotope ratios isotopes land plants marine environment Miocene n-alkanes Neogene organic compounds paleoclimatology photochemistry Photosynthesis Pliocene Quaternary reconstruction stable isotopes Stratigraphy terrestrial environment Tertiary |
| title | A 23 m.y. record of low atmospheric CO2 |
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