Coupling of surface temperatures and atmospheric CO2 concentrations during the Palaeozoic era

Rosemarie E. Came (), John M. Eiler, Ján Veizer, Karem Azmy, Uwe Brand and Christopher R. Weidman
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Rosemarie E. Came: California Institute of Technology, Pasadena, California 91125, USA
John M. Eiler: California Institute of Technology, Pasadena, California 91125, USA
Ján Veizer: Ottawa-Carleton Geoscience Centre, University of Ottawa, Ottawa, Ontario KIN 6N5, Canada
Karem Azmy: Memorial University of Newfoundland, St John’s, Newfoundland A1B 3X5, Canada
Uwe Brand: Brock University, St Catharines, Ontario L2S 3A1, Canada
Christopher R. Weidman: Waquoit Bay National Estuarine Research Reserve, Waquoit, Massachusetts 02536, USA

Nature, 2007, vol. 449, issue 7159, 198-201

Abstract: The CO2/temperature link Global warming sceptics were quick to pounce on the disagreement amongst geologists over whether high atmospheric CO2 concentrations were always associated with global warming in the distant geological past. But a new study adds further support to the conventional view that atmospheric CO2 concentrations and Earth surface temperatures have always been closely coupled. Analysis of Palaeozoic ocean temperatures, based on the 'carbonate clumped isotope' palaeothermometer, indicates that when atmospheric CO2 was high compared to modern levels, Earth temperatures were markedly elevated, and when atmospheric CO2 was nearly as low as today, temperatures were similar to today's.

Date: 2007
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DOI: 10.1038/nature06085

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