Atmospheric CO2 effect on stable carbon isotope composition of terrestrial fossil archives

Hare, Vincent; Loftus, Emma; Jeffrey, Amy; Ramsey, Christopher Bronk

doi:10.1038/s41467-017-02691-x

Cited by 97 publications

(47 citation statements)

References 71 publications

(74 reference statements)

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“…This CO 2 effect results in a higher isotopic fractionation when pCO 2 levels increase and thereby cause higher CIE magnitudes in terrigenic than in marine substrates 24 . Offsets in CIE magnitude of terrigenic versus marine substrates thus facilitate determination of absolute atmospheric pCO 2 levels 24,35 (for details we refer to the supplementary information). However, as pointed out by Schubert & Jahren (ref.…”

Section: Resultsmentioning

confidence: 99%

δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

Ruebsam

Reolid

Schwark

2020

Sci Rep

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throughout earth's history, variations in atmospheric co 2 concentration modulated climate. Understanding changes in atmospheric carbon cycle is therefore pivotal in predicting consequences of recent global warming. Here, we report stable carbon isotopes (δ 13 c) of molecular land plant fossils complemented by bulk organic and inorganic carbon fractions for early toarcian (early Jurassic) sediments that coincided with global warming and a carbon cycle perturbation. the carbon cycle perturbation is expressed by a negative excursion in the δ 13 C records established for the different substrates. Based on differences in the magnitude of the carbon isotope excursion recorded in land plants and marine substrates we infer that the early toarcian warming was paralleled by an increase in atmospheric co 2 levels from ~500 ppmv to ~1000 ppmv. Our data suggest that rising atmospheric co 2 levels resulted from the injection of 12 c-enriched methane and its subsequent oxidation to co 2. Based on the cyclic nature of the cie we concluded that methane was released from climate sensitive reservoirs, in particular permafrost areas. Moderate volcanic co 2 emissions led to a destabilization of the labile permafrost carbon pool triggering the onset of toarcian climate change only. the main carbon cycle perturbation then subsequently was driven by a self-sustained demise of a carbon-rich cryosphere progressing from mid to high latitudes as reflected by latitudinal climate gradients recorded in land plant carbon isotopes.

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Section: Resultsmentioning

confidence: 99%

δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

Ruebsam

Reolid

Schwark

2020

Sci Rep

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“…iv. A correction for Mg/Ca sw is usually applied to the pre-exponential component (B) of the relevant Mg/Catemperature calibration of the form Mg/Ca = Bexp AT (Hasiuk and Lohmann, 2010;Evans and Müller, 2012):…”

Section: Recommended Methodologies For Mg/camentioning

confidence: 99%

“…Evidence from multiple proxies indicates that early Paleogene Mg/Ca sw was significantly lower than the modern value (Horita et al, 2002;Coggon et al, 2010;Lear et al, 2015;Evans et al, 2018a). Correcting benthic Mg/Ca data for secular changes in seawater chemistry is complicated by the fact that the benthic foraminiferal magnesium partition coefficient (D Mg = Mg/Ca CALCITE /Mg/Ca sw ) decreases with increasing Mg/Ca sw according to a power function (Ries, 2004;Hasiuk and Lohmann, 2010;Evans and Müller, 2012;Lear et al, 2015). Moreover, the sensitivity of shell Mg/Ca to changes in Mg/Ca sw , specifically the curvature of the power relationship that relates the two factors, appears to be genus-specific.…”

Section: Weaknesses Of Mg/camentioning

confidence: 99%

The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database

et al. 2019

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Abstract. The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than those of the present day. As such, the study of early Eocene climate provides insight into how a super-warm Earth system behaves and offers an opportunity to evaluate climate models under conditions of high greenhouse gas forcing. The Deep Time Model Intercomparison Project (DeepMIP) is a systematic model–model and model–data intercomparison of three early Paleogene time slices: latest Paleocene, Paleocene–Eocene thermal maximum (PETM) and early Eocene climatic optimum (EECO). A previous article outlined the model experimental design for climate model simulations. In this article, we outline the methodologies to be used for the compilation and analysis of climate proxy data, primarily proxies for temperature and CO2. This paper establishes the protocols for a concerted and coordinated effort to compile the climate proxy records across a wide geographic range. The resulting climate “atlas” will be used to constrain and evaluate climate models for the three selected time intervals and provide insights into the mechanisms that control these warm climate states. We provide version 0.1 of this database, in anticipation that this will be expanded in subsequent publications.

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“…Weaknesses include: (i) potential for different responses among different plant groups (Hare et al 2018;Porter et al, 2017);…”

Section: Weakness Of C3 Land Plant Proxymentioning

confidence: 99%

The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database

Hollis¹,

Jones²,

Anagnostou³

et al. 2019

Preprint

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Abstract. The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than present day. As such, study of early Eocene climate provides insight into how a super-warm Earth system behaves and offers an opportunity to evaluate climate models under conditions of high greenhouse gas forcing. The Deep Time Model Intercomparison Project (DeepMIP) is a systematic model-model and model-data intercomparison of three early Paleogne time slices: latest Paleocene, Paleocene-Eocene thermal maximum and early Eocene climatic optimum. A previous article outlined the model experimental design for climate model simulations. In this article, we outline the methodologies to be used for the compilation and analysis of climate proxy data, primarily proxies for temperature and CO2. This paper establishes the protocols for a concerted and coordinated effort to compile the climate proxy records across a wide geographic range. The resulting climate atlas will be used to constrain and evaluate climate models for the three selected time intervals, and provide insights into the mechanisms that control these warm climate states. We provide version 0.1 of this database, in anticipation that this will be expanded in subsequent publications.

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Atmospheric CO2 effect on stable carbon isotope composition of terrestrial fossil archives

Cited by 97 publications

References 71 publications

δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database

The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database

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