No bioproductivity-induced sink for atmospheric CO2 in the glacial Southern Ocean: evidence from sedimentary fluxes of 10Be and biogenic Ba
Frank, M.; Nürnberg, C.C.; Gersonde, R.; Rutgers van der Loeff, M.M.; Bohrmann, G.; Kubik, P.W.; Mangini, A. (1998). No bioproductivity-induced sink for atmospheric CO2 in the glacial Southern Ocean: evidence from sedimentary fluxes of 10Be and biogenic Ba, in: Dehairs, F.A. et al. (Ed.) Integrated Marine System Analysis. European Network for Integrated Marine System Analysis FWO Vlaanderen: Proceedings of the second network meeting (Brussels, May 29-31, 1997). pp. 323-336
In: Dehairs, F.A.; Elskens, M.; Goeyens, L. (Ed.) (1998). Integrated Marine System Analysis - European Network for Integrated Marine System Analysis FWO Vlaanderen: Proceedings of the second network meeting (Brussels, May 29-31, 1997). VUB. Laboratorium voor Analytische Chemie: Brussel. 376 pp., meer
Recently, 230Thex normalized radionuclide paleofluxes to South Atlantic sediments were interpreted in terms of a higher biological productivity of glacial Southern Ocean surface waters (Kumar et al. 1995). We present a proxy data set from nearly the same area and claim that the glacial increase of 10Be deposition was weaker than previously estimated and that the sedimentary 10Be flux is much better correlated with the flux of detrital particles (Fe) than with biogenic Ba. This suggests that the 10Be deposition has been more controlled by detrital than biogenic particles and that increased glacial 10Be scavenging may well be solely explained by increased input of wind-blown dust particles. The export paleoproductivity reconstructed from biogenic barium in the same cores suggests rather an overall glacial decrease of biological productivity than an increase, which implies that a Southem Ocean bioproductivity increase may not serve as an explanation for glacial atmospheric CO2 drawdown.
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