Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmpp21c1710d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #PP21C-1710
Physics
1050 Marine Geochemistry (4835, 4845, 4850), 1616 Climate Variability (1635, 3305, 3309, 4215, 4513), 4271 Physical And Chemical Properties Of Seawater
Scientific paper
The paleo-pH-δ^{11}B technique was applied to modern (1950) and ancient Porites sampled from Tahiti (Moorea) and Marquesas Islands in the (sub-Equatorial) Central Pacific Ocean in order to analyze possible past changes of Ocean acidification and past evolution of the Δ pCO2 (pCO2 Atm.- Ocean). The MC-ICP-MS δ^{11}B measurements have an internal reproducibility of 0.1 ‰ (n = 22, NBS 981, 2sigma) and an analytical error of 0.2 ‰ for the samples. Moreover, very rigorous cleaning techniques have been applied on corals resulting in a stunning relationship between B concentration and isotopic composition. By using a fractionation factor ( α4-3 ) of 0.9807 issued from this study, B isotopic composition of modern seawater, and instrumental T, S data, reconstruction of pH values from modern corals agree with in-situ pH measurements at a precision of 0.02 pH-unit. From 11,500 cal. yr to 3250 cal. yr, pH values changed significantly from 8.05 to 8.24, respectively, that is in agreement with previously published estimates from corals (Gaillardet and Allègre, 1995). Our data confirm and quantify a rapid rise of pH values in seawaters at the end of the YD, which strongly coincides with the rate of atmospheric pCO2 changes as observed in EPICA Dome C (Monnin et al., 2001, 2004) suggesting a close relationship between atmospheric and oceanic pCO2 changes. So, the atmospheric pCO2 - pH relationship observed here both in the Central and Western Pacific Ocean (ERDC-92, Palmer and Pearson, 2003) suggests that, not only the high atmospheric CO2 content modified the mean pH values (decreasing trend), but also the rate of atmospheric CO2 changes on shorter timescale. Gaillardet J. and C.J. Allègre, Boron isotopic compositions of corals: seawater or diagenesis record? Earth and Planetary Science Letters, 136, 665-676, 1995. Monnin E., E.J. Steig, U. Siegenthaler, K. Kawamura, J. Schwander, B. Stauffer, T. F. Stocker, D. L. Morse, J.-M. Barnola, B. Bellier, D. Raynaud and H. Fischer, Evidence for substantial accumulation rate variability in Antarctica during the Holocene, through synchronization of CO2 in the Taylor Dome, Dome C and DML ice cores, Earth and Planetary Science Letters, 224, 45-54, 2004. Monnin E., A. Indermühle, A. Dällenbach, J. Flückiger, B. Stauffer, T. F. Stocker, D. Raynaud and J.M. Barnola, Atmospheric CO2 concentrations over the last glacial termination, Science, 291, 112-114, 2001. Palmer M.R. and P.N. Person, A 23,000-Year record of surface water pH and pCO2 in the Western Equatorial Pacific Ocean, Science, 300, 480-482, 2003.
Bouman Claudia
Cabioch Guy
Caillon N.
Chartier Frederic
Douville E.
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