Literature DB >> 20080721

Atmospheric CO2 concentrations during ancient greenhouse climates were similar to those predicted for A.D. 2100.

D O Breecker1, Z D Sharp, L D McFadden.   

Abstract

Quantifying atmospheric CO(2) concentrations ([CO(2)](atm)) during Earth's ancient greenhouse episodes is essential for accurately predicting the response of future climate to elevated CO(2) levels. Empirical estimates of [CO(2)](atm) during Paleozoic and Mesozoic greenhouse climates are based primarily on the carbon isotope composition of calcium carbonate in fossil soils. We report that greenhouse [CO(2)](atm) have been significantly overestimated because previously assumed soil CO(2) concentrations during carbonate formation are too high. More accurate [CO(2)](atm), resulting from better constraints on soil CO(2), indicate that large (1,000s of ppmV) fluctuations in [CO(2)](atm) did not characterize ancient climates and that past greenhouse climates were accompanied by concentrations similar to those projected for A.D. 2100.

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Year:  2009        PMID： 20080721      PMCID： PMC2818962          DOI： 10.1073/pnas.0902323106

Source DB:  PubMed          Journal:  Proc Natl Acad Sci U S A        ISSN： 0027-8424            Impact factor:   11.205


  8 in total

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  8 in total
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10.  Fossil Atmospheres: a case study of citizen science in question-driven palaeontological research.

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