CaltechAUTHORS
  A Caltech Library Service

Coupling of surface temperatures and atmospheric CO_2 concentrations during the Palaeozoic era

Came, Rosemarie E. and Eiler, John M. and Veizer, Ján and Azmy, Karem and Brand, Uwe and Weidman, Christopher R. (2007) Coupling of surface temperatures and atmospheric CO_2 concentrations during the Palaeozoic era. Nature, 449 (7159). pp. 198-201. ISSN 0028-0836. https://resolver.caltech.edu/CaltechAUTHORS:20121119-114510098

[img]
Preview
PDF - Supplemental Material
See Usage Policy.

351Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20121119-114510098

Abstract

Atmospheric carbon dioxide concentrations seem to have been several times modern levels during much of the Palaeozoic era (543–248 million years ago), but decreased during the Carboniferous period to concentrations similar to that of today. Given that carbon dioxide is a greenhouse gas, it has been proposed that surface temperatures were significantly higher during the earlier portions of the Palaeozoic era. A reconstruction of tropical sea surface temperatures based on the δ^(18)O of carbonate fossils indicates, however, that the magnitude of temperature variability throughout this period was small, suggesting that global climate may be independent of variations in atmospheric carbon dioxide concentration. Here we present estimates of sea surface temperatures that were obtained from fossil brachiopod and mollusc shells using the 'carbonate clumped isotope' method—an approach that, unlike the δ^(18)O method, does not require independent estimates of the isotopic composition of the Palaeozoic ocean. Our results indicate that tropical sea surface temperatures were significantly higher than today during the Early Silurian period (443–423 Myr ago), when carbon dioxide concentrations are thought to have been relatively high, and were broadly similar to today during the Late Carboniferous period (314–300 Myr ago), when carbon dioxide concentrations are thought to have been similar to the present-day value. Our results are consistent with the proposal that increased atmospheric carbon dioxide concentrations drive or amplify increased global temperatures.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/nature06085DOIArticle
https://rdcu.be/b3WG0PublisherFree ReadCube access
Additional Information:© 2007 Nature Publishing Group. Received 15 April; accepted 3 July 2007. We thank H. Affek, W. Guo and P. Ghosh for laboratory advice, and A. Wanamaker for assistance with samples.
Issue or Number:7159
Record Number:CaltechAUTHORS:20121119-114510098
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121119-114510098
Official Citation:Came, R., Eiler, J., Veizer, J. et al. Coupling of surface temperatures and atmospheric CO2 concentrations during the Palaeozoic era. Nature 449, 198–201 (2007). https://doi.org/10.1038/nature06085
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35545
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:20 Nov 2012 15:53
Last Modified:04 May 2020 18:37

Repository Staff Only: item control page