139 Pages

Modeling the spatial and temporal variability of marine radiocarbon reservoir ages in the late quaternary [Elektronische Ressource] / vorgelegt von Jörg Franke


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Modeling the Spatial and TemporalVariability of Marine RadiocarbonReservoir Ages in the LateQuaternaryDissertation zur Erlangung des Doktorgrades der Naturwissenschaftenam Fachbereich Geowissenschaften der Universit¨ at Bremenvorgelegt von J¨ org FrankeBetreuer und 1. Gutachter : Prof. Dr. M. Schulz2. Gutachterin: Prof. Dr. G. MollenhauerEingereicht am 04.02.2008iiLife is like riding a bicycle. To keep your balance you must keep moving.- Albert Einstein -iiiivAbstract14In paleoceanography and paleoclimatology radiocarbon ( C) is frequently used to datecarbonaceous samples of the past 50,000 years and as a proxy to reconstruct circulation14 14states of the ocean. Temporal variations of the atmospheric C concentration (Δ C ),atm14caused by a varying C production rate or changes in the global carbon cycle, lead to14dating uncertainties and also limit the usability of C as an oceanographic proxy. In14order to analyze and correct the influence of varying atmospheric C on the ocean, ra-diocarbon has been included as a tracer to a global climate model (University of VictoriaEarth System Climate Model). This model was forced by the reconstructed atmospheric14 14C production rate, to predict differences between atmospheric and marine C age, theso-called reservoir age, spatially and temporally. The model simulations confirmed the14earlier results of box models that the reconstructed Δ C in the atmosphere cannot be14explained by C production-rate changes alone.



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Published 01 January 2008
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Language English
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