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  • 2020-2024  (100)
  • 2020-2022  (19)
  • 2000-2004  (3)
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Keywords
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Year
  • 1
    Book
    Book
    Mineral resources of the deep sea : formation, potential and risks (2020)
    Kiel : GEOMAR
    Details Availability
    Type of Medium: Book
    Pages: 34 Seiten , Illustrationen
    Parallel Title: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel Parallele Sprachausgabe Mineralische Rohstoffe aus der Tiefsee
    Language: English
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    GEOMAR CATALOGUE
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  • 2
    Online Resource
    Online Resource
    MiningImpact 2 - Environmental impacts and risks of deep-sea mining : Abschlussbericht : Vorhabenbezeichnung: Mn-Monstr - Monitoringkonzepte für einen Manganknollenabbau in der Tiefsee : Laufzeit des Vorhabens: 1.8.2018-28.2.2022 (2022)
    Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
    Details Availability
    Keywords: Forschungsbericht ; Meeresbergbau ; Umweltbelastung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (39 Seiten, 1,58 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb23/1867481707.pdf
    URL: https://doi.org/10.2314/KXP:1867481707
    DOI: 10.2314/KXP:1867481707
    Language: German , English
    Note: Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Förderkennzeichen BMBF 03F0812A , Verbundnummer 01183428 , Sprache der Kurzfassungen: Deutsch, Englisch
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  • 3
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    Unknown
    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
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    OceanRep: Thesis - not published by a publisher
  • 4
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    Mineralische Rohstoffe der Tiefsee (2020)
    Schweizerbart
    In:  In: Tiefsee - Vielfalt in der Dunkelheit. , ed. by Müller, T. and Hoffmann-Wieck, G. Senckenberg-Buch, 83 . Schweizerbart, Stuttgart, pp. 147-149. ISBN 978-3-510-61415-8
    Details
    Publication Date: 2020-06-03
    Description: Die Erde hält eine Vielzahl natürlicher mineralischer Rohstoffe bereit, die wir in unserer hochtechnisierten Gesellschaft benötigen. Zurzeit werden fast alle diese Rohstoffe auf einer Fläche abgebaut, die weniger als ein Drittel unseres Planeten ausmacht -der Landfläche. Hier wird es jedoch immer schwieriger, reiche Vorkommen zu finden. Dies zwingt die Bergbauindustrie dazu, Lagerstätten mit geringeren Konzentrationen abzubauen bzw. nach Lagerstätten in abgelegenen Regionen der Erde oder in großer Tiefe zu suchen. Dies ist jedoch mit einem erheblichen Anstieg des Flächenverbrauchs und mit zusätzlichen Umweltbeeinträchtigungen verbunden.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 5
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    A geochemical model of the Peru Basin deep-sea floor and the response of the system to technical impacts (2001)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 48 . pp. 3737-3756.
    Details
    Publication Date: 2020-08-05
    Description: A geochemical model of the Peru Basin deep-sea floor, based on an extensive set of field data as well as on numerical simulations, is presented. The model takes into account the vertical oscillations of the redox zonation that occur in response to both long-term (glacial/interglacial) and short-term (El Niño Southern Oscillation (ENSO) time scale) variations in the depositional flux of organic matter. Field evidence of reaction between the pore water NO3− and an oxidizable fraction of the structural Fe(II) in the clay mineral content of the deep-sea sediments is provided. The conditions of formation and destruction of reactive clay Fe(II) layers in the sea floor are defined, whereby a new paleo-redox proxy is established. Transitional NO3− profile shapes are explained by periodic contractions and expansions of the oxic zone (ocean bottom respiration) on the ENSO time scale. The near-surface oscillations of the oxic–suboxic boundary constitute a redox pump mechanism of major importance with respect to diagenetic trace metal enrichments and manganese nodule formation, which may account for the particularly high nodule growth rates in this ocean basin. These conditions are due to the similar depth ranges of both the O2 penetration in the sea floor and the bioturbated high reactivity surface layer (HRSL), all against the background of ENSO-related large variations in depositional Corg flux. Removal of the HRSL in the course of deep-sea mining would result in a massive expansion of the oxic surface layer and, thus, the shut down of the near-surface redox pump for centuries, which is demonstrated by numerical modeling.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(01)00065-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    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
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Methanhydrate (2020)
    Schweizerbart
    In:  In: Tiefsee - Vielfalt ind der Dunkelheit. , ed. by Müller, T. and Hoffmann-Wieck, G. Senckenberg-Buch, 83 . Schweizerbart, Stuttgart, pp. 156-158. ISBN 978-3-510-61415-8
    Details
    Publication Date: 2020-06-03
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 8
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    Environmental Impacts of Deep Seabed Mining (2020)
    Brill
    In:  In: New Knowledge and Changing Circumstances in the Law of the Sea. , ed. by Heidar, T. Brill, Leiden, pp. 327-342. ISBN 978-90-04-43775-3
    Details
    Publication Date: 2020-09-14
    Description: Exploitation of mineral ores from the deep sea will impact the abyssal environment by removing the mineral deposits and sediments from the seafloor surface, where most deep-sea benthic life is found. Additional effects are expected from the blanketing of the mined area and the pristine surrounding seabed with sediments and/or mineral debris. As a consequence, seafloor integrity is lost in the impacted area, species densities and biodiversity are reduced, and ecosystem functions are negatively affected. Although a lot of open questions remain regarding, for example, indicator species, disturbance thresholds, and renaturation options, it is becoming increasingly clear that the induced environmental impacts last for at least many decades to centuries and affect all ecosystem compartments.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1163/9789004437753_018
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    OceanRep: Book chapter
  • 9
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    A novel set-up for combined imaging and flow-through experiments with sediment cores (2020)
    In:  [Poster] In: 4. International Workshop on Offshore Geologic CO2 Storage and STEMM-CCS Open Science Meeting, 11.-12.02.2020, Bergen, Norway .
    Details
    Publication Date: 2020-02-19
    Type: Conference or Workshop Item , NonPeerReviewed , info:eu-repo/semantics/conferenceObject
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    OceanRep: Poster
  • 10
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    3-D Dynamics of a natural gas hydrate system in the western Black Sea (2023)
    Details
    Publication Date: 2023-11-30
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Poster
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