CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse

Abstract CO2 is considered the main greenhouse gas involved in the current global warming and the primary driver of temperature throughout Earth’s history. However, the soundness of this relationship across time scales and during different climate states of the Earth remains uncertain. Here we explo...

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Autores principales:	Abel Barral, Bernard Gomez, François Fourel, Véronique Daviero-Gomez, Christophe Lécuyer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0a3205dcedcd461f89e340fcdb752c67
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spelling	oai:doaj.org-article:0a3205dcedcd461f89e340fcdb752c672021-12-02T11:52:16ZCO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse10.1038/s41598-017-08234-02045-2322https://doaj.org/article/0a3205dcedcd461f89e340fcdb752c672017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08234-0https://doaj.org/toc/2045-2322Abstract CO2 is considered the main greenhouse gas involved in the current global warming and the primary driver of temperature throughout Earth’s history. However, the soundness of this relationship across time scales and during different climate states of the Earth remains uncertain. Here we explore how CO2 and temperature are related in the framework of a Greenhouse climate state of the Earth. We reconstruct the long-term evolution of atmospheric CO2 concentration (pCO2) throughout the Cretaceous from the carbon isotope compositions of the fossil conifer Frenelopsis. We show that pCO2 was in the range of ca. 150–650 ppm during the Barremian–Santonian interval, far less than what is usually considered for the mid Cretaceous. Comparison with available temperature records suggest that although CO2 may have been a main driver of temperature and primary production at kyr or smaller scales, it was a long-term consequence of the climate-biological system, being decoupled or even showing inverse trends with temperature, at Myr scales. Our analysis indicates that the relationship between CO2 and temperature is time scale-dependent at least during Greenhouse climate states of the Earth and that primary productivity is a key factor to consider in both past and future analyses of the climate system.Abel BarralBernard GomezFrançois FourelVéronique Daviero-GomezChristophe LécuyerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abel Barral Bernard Gomez François Fourel Véronique Daviero-Gomez Christophe Lécuyer CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
description	Abstract CO2 is considered the main greenhouse gas involved in the current global warming and the primary driver of temperature throughout Earth’s history. However, the soundness of this relationship across time scales and during different climate states of the Earth remains uncertain. Here we explore how CO2 and temperature are related in the framework of a Greenhouse climate state of the Earth. We reconstruct the long-term evolution of atmospheric CO2 concentration (pCO2) throughout the Cretaceous from the carbon isotope compositions of the fossil conifer Frenelopsis. We show that pCO2 was in the range of ca. 150–650 ppm during the Barremian–Santonian interval, far less than what is usually considered for the mid Cretaceous. Comparison with available temperature records suggest that although CO2 may have been a main driver of temperature and primary production at kyr or smaller scales, it was a long-term consequence of the climate-biological system, being decoupled or even showing inverse trends with temperature, at Myr scales. Our analysis indicates that the relationship between CO2 and temperature is time scale-dependent at least during Greenhouse climate states of the Earth and that primary productivity is a key factor to consider in both past and future analyses of the climate system.
format	article
author	Abel Barral Bernard Gomez François Fourel Véronique Daviero-Gomez Christophe Lécuyer
author_facet	Abel Barral Bernard Gomez François Fourel Véronique Daviero-Gomez Christophe Lécuyer
author_sort	Abel Barral
title	CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
title_short	CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
title_full	CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
title_fullStr	CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
title_full_unstemmed	CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse
title_sort	co2 and temperature decoupling at the million-year scale during the cretaceous greenhouse
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0a3205dcedcd461f89e340fcdb752c67
work_keys_str_mv	AT abelbarral co2andtemperaturedecouplingatthemillionyearscaleduringthecretaceousgreenhouse AT bernardgomez co2andtemperaturedecouplingatthemillionyearscaleduringthecretaceousgreenhouse AT francoisfourel co2andtemperaturedecouplingatthemillionyearscaleduringthecretaceousgreenhouse AT veroniquedavierogomez co2andtemperaturedecouplingatthemillionyearscaleduringthecretaceousgreenhouse AT christophelecuyer co2andtemperaturedecouplingatthemillionyearscaleduringthecretaceousgreenhouse
_version_	1718395085660356608

CO2 and temperature decoupling at the million-year scale during the Cretaceous Greenhouse

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