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  • 1
    Buch
    Buch
    Sedimente in bodengebundenen Dichteströmungen : numerische Fallstudien (1996)
    Kiel : Sonderforschungsbereich 313
    Details Verfügbarkeit
    Schlagwort(e): Dissertation ; Hochschulschrift
    Materialart: Buch
    Seiten: 106 S , graph. Darst., Kt
    Serie: Berichte aus dem Sonderforschungsbereich 313, Veränderungen der Umwelt - Der Nördliche Nordatlantik 66
    Sprache: Deutsch
    Anmerkung: Zugl.: Hamburg, Univ., FB Geowiss., Diss., 1996
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
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    Sediments in Bottom-Arrested Gravity Plumes: Numerical Case Studies (1998)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 28 (11). pp. 2250-2274.
    Details
    Publikationsdatum: 2018-04-06
    Beschreibung: In the present paper a hydrostatic “reduced gravity” model, generally used to simulate transient bottom-arrested gravity plumes, was coupled with a sediment transport model. The coupled model considers the respective contribution of suspended sediment particles on the buoyancy of a plume and allows one to simulate autosuspension and size-differential deposition of sediments based on the local turbulence and settling velocities. Simulations using the coupled model reveal that sediment-enriched plumes are able to inject both entrained and original shelf water masses into intermediate and bottom layers of an adjacent ocean basin in an ageostrophic dynamical balance. Hence the mechanism described here is more rapid than classic, “seawater” plumes, which are solely driven by surplus density of the water masses. Results suggest that “turbidity” plumes may constitute an important process in the formation and renewal of deep waters in the Arctic Ocean. In case a turbidity plume reaches its level of equilibrium density, deposition of suspended particles causes the density of the interstitial fluid to be lower than the density of the ambient fluid. This initiates upward convection within the water column. The substantial difference between TS- and turbidity plumes is described by model experiments that utilize idealized slope and sediment distributions. A realistic simulation of a turbidity plume cascading down the continental slope of the western Barents Sea is presented. The computed distribution of deposited sediments agrees well with observations in an area of high accumulation of shelf-derived sediments. The frequency of occurrence of sediment-enriched gravity plumes originating from the Barents Sea shelf is estimated from the various geological variables (thickness of sediments at the bottom, grain size composition) measured from bottom sediments samples.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(1998)028〈2250:SIBAGP〉2.0.CO;2
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 3
    facet.materialart.
    Unbekannt
    Sedimente in bodengebundenen Dichteströmungen : numerische Fallstudien (1996)
    In:  (PhD/ Doctoral thesis), Universität Hamburg, Hamburg, Germany, 106 pp . Berichte aus dem Sonderforschungsbereich 313, Veränderungen der Umwelt - Der Nördliche Nordatlantik, 66 .
    Details
    Publikationsdatum: 2019-02-15
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Hochschulschrift - nicht über Verlag veröffentlicht
  • 4
    facet.materialart.
    Unbekannt
    Modern Ocean Current-Controlled Sediment Transport in the Greenland-Iceland-Norwegian (GIN) Seas (2001)
    Springer
    In:  In: The Northern North Atlantic : a changing environment. , ed. by Schäfer, P., Ritzrau, W., Schlüter, M. and Thiede, J. Springer, Heidelberg, pp. 135-154.
    Details
    Publikationsdatum: 2017-11-16
    Beschreibung: Sediment transport processes in the northern North Atlantic have been investigated on the basis of various numerical models. A general circulation model has been used to investigate large-scale particle transport, a reduced gravity plume model has been used to investigate particle transport by cascading from the shelves into the deep basins, an ocean slice model has been used to investigate particle exchange processes between a bottom current and the ambient water mass, and a Bottom Boundary Layer model has been used to investigate particle interactions influencing the settling behavior of suspended particles. In this paper, the various processes investigated in these models are described (i) schematically, (ii) on the basis of field data, if available, and (iii) by employing results from numerical simulations. In a first attempt the northern North Atlantic will be divided into separate process defined areas, which can be used in carbon budgeting, for example.
    Materialart: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1007/978-3-642-56876-3_9
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Buchkapitel
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