Implications of a Carbonate Ion Effect on Shell Carbon and Oxygen Isotopes for Glacial Ocean Conditions View Full Text


Ontology type: schema:Chapter      Open Access: True


Chapter Info

DATE

1999

AUTHORS

D. W. Lea , J. Bijma , H. J. Spero , D. Archer

ABSTRACT

Experimental work demonstrates that the carbon and oxygen isotopic composition of planktic foraminifera shells is directly influenced by the carbonate equilibrium state of seawater (Spero et al. 1997). Because the pCO2 of the sea surface and the atmosphere must be in approximate equilibrium, the glacial drop in atmospheric carbon dioxide recorded in ice cores must have been accompanied by an increase in surface water carbonate ion concentration. Calculations indicate that increased carbonate ion during glacial episodes can account for much or all of the observed negative δ13C shift in planktic shells. This discovery provides a novel explanation for the large, negative swings in planktic δ13C observed in the glacial sections of Southern Ocean cores. It also presents an alternative hypothesis to the terrestrial biosphere-to-ocean transfer of carbon that is generally accepted as an explanation for lower glacial shell δ13C values (Shackleton 1977). Our analysis suggests that shell isotopic composition can provide a constraint on the extent of oceanic carbonate ion changes, potentially narrowing explanations for the glacial pCO2 drawdown. Correcting for the influence of the carbonate ion effect on shell δ18O lowers glacial tropical sea surface temperature (SST) estimates by up to 1°C, which brings oxygen isotope paleotemperatures closer to those marine SST proxies (e.g. coral Sr/Ca) and those terrestrial indicators (e.g. snow-line and ice core δ18O) that suggest more intense tropical cooling at the last glacial maximum (Guilderson et al. 1994; Thompson etal.1995). More... »

PAGES

513-522

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-642-58646-0_21

DOI

http://dx.doi.org/10.1007/978-3-642-58646-0_21

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032921147


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