DOI: 10.1002/2014GL060457
论文题名: New constraints on atmospheric CO2 concentration for the Phanerozoic
作者: Franks P.J. ; Royer D.L. ; Beerling D.J. ; Van De Water P.K. ; Cantrill D.J. ; Barbour M.M. ; Berry J.A.
刊名: Geophysical Research Letters
ISSN: 0094-10001
EISSN: 1944-9732
出版年: 2014
卷: 41, 期: 13 起始页码: 4685
结束页码: 4694
语种: 英语
英文关键词: fossils
; paleoatmosphere
; paleobotany
; paleoclimate
Scopus关键词: Carbon
; Isotopes
; Monte Carlo methods
; Uncertainty analysis
; Atmospheric CO
; fossils
; Paleo-atmosphere
; paleobotany
; Paleoclimates
; Carbon dioxide
英文摘要: Earth's atmospheric CO2 concentration (ca) for the Phanerozoic Eon is estimated from proxies and geochemical carbon cycle models. Most estimates come with large, sometimes unbounded uncertainty. Here, we calculate tightly constrained estimates of ca using a universal equation for leaf gas exchange, with key variables obtained directly from the carbon isotope composition and stomatal anatomy of fossil leaves. Our new estimates, validated against ice cores and direct measurements of ca, are less than 1000 ppm for most of the Phanerozoic, from the Devonian to the present, coincident with the appearance and global proliferation of forests. Uncertainties, obtained from Monte Carlo simulations, are typically less than for ca estimates from other approaches. These results provide critical new empirical support for the emerging view that large (~2000-3000 ppm), long-term swings in ca do not characterize the post-Devonian and that Earth's long-term climate sensitivity to ca is greater than originally thought. Key Points A novel CO2 proxy calculates past atmospheric CO2 with improved certainty CO2 is unlikely to have exceeded ~1000 ppm for extended periods post Devonian Earth's long-term climate sensitivity to CO2 is greater than originally thought ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903866336&doi=10.1002%2f2014GL060457&partnerID=40&md5=48074d80b3a5e9698519b7c05ed6c752
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7265
Appears in Collections: 气候减缓与适应
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作者单位: Faculty of Agriculture and Environment, University of Sydney, Sydney NSW, Australia
Recommended Citation:
Franks P.J.,Royer D.L.,Beerling D.J.,et al. New constraints on atmospheric CO2 concentration for the Phanerozoic[J]. Geophysical Research Letters,2014-01-01,41(13).