Computer Science
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000natur.408..951l&link_type=abstract
Nature, Volume 408, Issue 6815, pp. 951-954 (2000).
Computer Science
25
Scientific paper
Ocean pHis particularly sensitive to atmospheric carbon dioxide content. Records of ocean pHcan therefore be used to estimate past atmospheric carbon dioxide concentrations. The isotopic composition of boron (δ11B) contained in the carbonate shells of marine organisms varies according to pH, from which ocean pH can be reconstructed. This requires independent estimates of the δ11B of dissolved boron in sea water through time. The marine δ11B budget, however, is still largely unconstrained. Here we show that, by incorporating the global flux of riverine boron (as estimated from δ11B measurements in 22 of the world's main rivers), the marine boron isotope budget can be balanced. We also derive ocean δ11B budgets for the past 120Myr. Estimated isotope compositions of boron in sea water show a remarkable consistency with records of δ11B in foraminiferal carbonates, suggesting that foraminifera δ11B records may in part reflect changes in the marine boron isotope budget rather than changes in ocean pH over the Cenozoic era.
Allègre Claude
Gaillardet Jérôme
Lemarchand Damien
Lewin Erik
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