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  • Springer  (2)
  • AGU (American Geophysical Union)  (1)
  • GeoUnion
  • 2015-2019  (3)
  • 1
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    Phase-shift between surface ocean warming, evaporation and changes of continental ice volume during Termination I observed at tropical ocean sediment cores (2015)
    Springer
    In:  In: Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC). , ed. by Schulz, M. and Paul, A. Springer Briefs in Earth System Sciences . Springer, Cham, pp. 49-53. ISBN 978-3-319-00692-5
    Details
    Publication Date: 2019-09-23
    Description: The hypothesis that the tropical oceans lead the global warming at the Termination I and II by ~2,000 to ~3,000 years (Visser et al. 2003) whereas melting of the northern continental ice masses is lacking behind challenges the Milankovitch theory of climate change and emphasizes the role of the tropics for global climate change. Although the simultaneous multi-proxy approach of planktonic foraminiferal Mg/Ca, δ18O and δ44/40Ca from tropical sediment core SO-164-03-4 (16° 32.37′ N; 72° 12.31′ W; 2,744 m) from the Caribbean tend to confirm the observation by Visser et al. (2003) we interpret the shift between Mg/Ca and δ18O in core SO-164-03-4 to be due to local changes in sea-surface salinity (SSS) variations triggered by glacial/interglacial related shifts of the Inter-tropical Convergence Zone (ITCZ).
    Type: Book chapter , PeerReviewed
    Format: text
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  • 2
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    Radiogenic Tracers (2016)
    Springer
    In:  In: Encyclopedia of Marine Geosciences. , ed. by Harff, J., Meschede, M., Petersen, S. and Thiede, J. Springer, Dordrecht, pp. 699-700. ISBN 978-94-007-6239-4
    Details
    Publication Date: 2018-01-19
    Description: Isotopes can be characterized to be stable, cosmogenic, radioactive, or radiogenic. Stable isotopes do not change their relative abundance in the environment as long as no isotopes are added or extracted from the system. Cosmogenic isotopes are produced by high energetic cosmic rays in the upper layers of the atmosphere and are usually radioactive also. Radioactive isotopes change their abundance in the environment according to their half-life (T1/2), whereas radiogenic isotopes are not radioactive itself but change their abundance according to the half-life of their mother isotope. There are several important radiogenic systems known, and the most important are 238U/206Pb, 190Pt/186Os, 147Sm/143Nd, 87Rb/87Sr, 187Re/187Os, 176Lu/176Hf, 232Th/208Pb, 40 K/40Ar, 40 K/40Ca, 235U/207Pb, 129I/129Xe, 10Be/10B, 26Al/26 Mg, 36Cl/36Ar, 14C/14 N, etc. For the geological sciences, the most important radiogenic isotope systems are the radiogenic system ...
    Type: Book chapter , PeerReviewed
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  • 3
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    Environmental constraints on Holocene cold-water coral reef growth off Norway: Insights from a multi-proxy approach (2016)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-03-22
    Description: High-latitude cold-water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6°N, Oslofjord 59°N) we applied boron isotopes (δ11B), Ba/Ca, Li/Mg and U/Ca ratios to reconstruct the environmental boundary conditions of CWC reef growth. The sedimentary record from these CWC reefs reveals a lack of corals between ∼ 6.4 and 4.8 ka. The question remains if this phenomenon is related to changes in the carbonate system or other causes. The initial postglacial setting had elevated Ba/Ca ratios, indicative of meltwater fluxes showing a decreasing trend towards cessation at 6.4 ka with a oscillation pattern similar to continental glacier fluctuations. Downcore U/Ca ratios reveal an increasing trend, which is outside the range of modern U/Ca variability in L. pertusa, suggesting changes of seawater pH near 6.4 ka. The reconstructed BWT at Lopphavet reveals a striking similarity to Barent Sea-Surface and sub-Sea-Surface-Temperature records. We infer that meltwater pulses weakened the North Atlantic Current system resulting in southward advances of cold and CO2 rich Arctic waters. A corresponding shift in the δ11B record from ∼ 25.0‰ to ∼ 27.0 ‰ probably implies enhanced pH-up regulation of the CWCs due to the higher pCO2 concentrations of ambient seawater, which hastened Mid-Holocene CWC reef decline on the Norwegian Margin.
    Type: Article , PeerReviewed
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