Document Detail

A carbon isotope record of CO2 levels during the late Quaternary.
MedLine Citation:
PMID:  11536468     Owner:  NASA     Status:  MEDLINE    
Analyses of gases trapped in continental ice sheets have shown that the concentration of CO2 in the Earth's early atmosphere increased from 180 to 280 p.p.m. during the most recent glacial-interglacial transition. This change must have been driven by an increase in the concentration of CO2 dissolved in the mixed layer of the ocean. Biochemical and physiological factors associated with photosynthetic carbon fixation in this layer should lead to a relationship between concentrations of dissolved CO2 and the carbon isotopic composition of phytoplanktonic organic material, such that increased atmospheric CO2 should enhance the difference in 13C content between dissolved inorganic carbon and organic products of photosynthesis. Here we show that a signal related to atmospheric CO2 levels can be seen in the isotope record of a hemipelagic sediment core, which we can correlate with the CO2 record of the Vostok ice core. Calibration of the relationship between isotope fractionation and CO2 levels should permit the extrapolation of CO2 records to times earlier than those for which ice-core records are available.
J P Jasper; J M Hayes
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Nature     Volume:  347     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  1990 Oct 
Date Detail:
Created Date:  1996-03-25     Completed Date:  1996-03-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  462-4     Citation Subset:  S    
Department of Geological Sciences, Indiana University, Bloomington 47405-5101, USA.
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MeSH Terms
Carbon / analysis*
Carbon Dioxide / analysis*
Carbon Isotopes
Geological Phenomena
Ice / analysis*
Oceans and Seas
Reg. No./Substance:
0/Carbon Isotopes; 0/Ice; 124-38-9/Carbon Dioxide; 7440-44-0/Carbon
J M Hayes / IN U, Bloomington, Depts Geol Sci & Chem

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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