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  • 2005-2009
  • 2000-2004  (2)
  • 2004  (1)
  • 2000  (1)
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  • 2005-2009
  • 2000-2004  (2)
Year
  • 1
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    Mathematical models of early diagenetic processes: Impacts on the biogeochemical environment of the deep-sea floor (2000)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 147 pp
    Details
    Publication Date: 2020-06-24
    Description: In this work, multicomponent transport-reaction models were successfully applied to analyse and assess the effects of human interventions and natural, large-scale perturbations of the deep-sea floor. In particular, two scenarios were studied that are suitable as case studies for a variety of possible impacts. Firstly, the removal of the uppermost bioturbated sediment layer due to deepsea mining of manganese nodules in the Peru Basin is considered, and secondly, the disposal of highly reactive material on the deep-sea floor of the South China Sea, i.e. the Mount Pinatubo ash fallout of 1991, is evaluated. In addition, the current theoretical background for equilibrium calculations is expanded, and by this a mathematical tool is provided that, for example, may allow an evaluation of the influence of calcite dissolution and precipitation at the sea floor on the global C02 budget.
    Type: Thesis , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Thesis - not published by a publisher
  • 2
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    Unknown
    Rising methane gas bubbles form massive hydrate layers at the seafloor (2004)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 68 (21). pp. 4335-4354.
    Details
    Publication Date: 2017-09-08
    Description: Extensive methane hydrate layers are formed in the near-surface sediments of the Cascadia margin. An undissociated section of such a layer was recovered at the base of a gravity core (i.e. at a sediment depth of 120 cm) at the southern summit of Hydrate Ridge. As a result of salt exclusion during methane hydrate formation, the associated pore waters show a highly elevated chloride concentration of 809 mM. In comparison, the average background value is 543 mM. A simple transport-reaction model was developed to reproduce the Cl- observations and quantify processes such as hydrate formation, methane demand, and fluid flow. From this first field observation of a positive Cl- anomaly, high hydrate formation rates (0.15–1.08 mol cm-2 a-1) were calculated. Our model results also suggest that the fluid flow rate at the Cascadia accretionary margin is constrained to 45–300 cm a-1. The amount of methane needed to build up enough methane hydrate to produce the observed chloride enrichment exceeds the methane solubility in pore water. Thus, most of the gas hydrate was most likely formed from ascending methane gas bubbles rather than solely from CH4 dissolved in the pore water.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2004.01.018
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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