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  • 11
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    Die Modellierung mesoskaliger quasigeostrophischer Instabilität (1987)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 155 pp . Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 167 . DOI 10.3289/ifm_ber_167 〈http://dx.doi.org/10.3289/ifm_ber_167〉.
    Details
    Publication Date: 2014-10-14
    Type: Thesis , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_167
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    OceanRep: Thesis - not published by a publisher
  • 12
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    Zur Kinematik und Dynamik barotroper Rossby-Wellen in einem Stromaufspaltungsgebiet (1984)
    In:  (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 108 pp
    Details
    Publication Date: 2021-03-25
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 13
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    DYNAMO : dynamics of North Atlantic models : simulation and assimilation with high resolution models (1997)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 294 . Institut für Meereskunde, Kiel, Germany, 334 pp.
    Details
    Publication Date: 2019-09-23
    Type: Report , NonPeerReviewed
    Format: text
    Format: text
    Format: text
    Format: text
    Format: text
    DOI: 10.3289/ifm_ber_294
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    OceanRep: Report - other report
  • 14
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    Effects of increased horizontal resolution in a simulation of the North Atlantic Ocean (1994)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 24 . pp. 326-344.
    Details
    Publication Date: 2018-04-05
    Description: Global mean and eddy fields from a four-year experiment with a 1/6° × 1/5° horizontal resolution implementation of the CME North Atlantic model are presented. The time-averaged wind-driven and thermohaline circulation in the model is compared to the results of a 1/3° × 2/5° model run in very similar configuration. In general, the higher resolution results are found to confirm that the resolution of previous CME experiments is sufficient to describe many features of the large-scale circulation and water mass distribution quite well. While the increased resolution does not lead to large changes in the mean flow patterns, the variability in the model is enhanced significantly. On the other hand, however, not all aspects of the circulation have improved with resolution. The Azores Current Frontal Zone with its variability in the eastern basin is still represented very poorly. Particular attention is also directed toward the unrealistic stationary anticyclones north of Cape Hatteras and in the Gulf of Mexico.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(1994)024〈0326:EOIHRI〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 15
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    Dynamics of North Atlantic Models: Simulation and assimilation with resolution models (1997)
    In:  UNSPECIFIED, 334 pp.
    Details
    Publication Date: 2015-10-12
    Type: Report , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Report - internal report
  • 16
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    On the seasonal variability and eddies in the North Brazil Current: insights from model intercomparison experiments (2001)
    Elsevier
    In:  Progress in Oceanography, 48 (2-3). pp. 195-230.
    Details
    Publication Date: 2016-10-07
    Description: The time dependent circulation of the North Brazil Current is studied with three numerical ocean circulation models, which differ by the vertical coordinate used to formulate the primitive equations. The models are driven with the same surface boundary conditions and their horizontal grid-resolution (isotropic, 1/3° at the equator) is in principle fine enough to permit the generation of mesoscale eddies. Our analysis of the mean seasonal currents concludes that the volume transport of the North Brazil Current (NBC) at the equator is principally determined by the strength of the meridional overturning, and suggests that the return path of the global thermohaline circulation is concentrated in the NBC. Models which simulate a realistic overturning at 24°N of the order of 16–18 Sv also simulate a realistic NBC transport of nearly 35 Sv comparable to estimates deduced from the most recent observations. In all models, the major part of this inflow of warm waters from the South Atlantic recirculates in the zonal equatorial current system, but the models also agree on the existence of a permanent coastal mean flow to the north-west, from the equator into the Carribean Sea, in the form of a continuous current or a succession of eddies. Important differences are found between models in their representation of the eddy field. The reasons invoked are the use of different subgrid-scale parameterisations, and differences in stability of the NBC retroflection loop because of differences in the representation of the effect of bottom friction according to the vertical coordinate that is used. Finally, even if differences noticed between models in the details of the seasonal mean circulation and water mass properties could be explained by differences in the eddy field, nonetheless the major characteristics (mean seasonal currents, volume and heat transports) appears to be at first order driven by the strength of the thermohaline circulation.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0079-6611(01)00005-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 17
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    On the generation and role of eddy variability in the central North Atlantic Ocean: Results from surface drifters satellite altimetry and numerical modelling (1994)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 99 (C10). pp. 20381-20391.
    Details
    Publication Date: 2019-09-23
    Description: Sources of near-surface oceanic variability in the central North Atlantic are identified from a combined analysis of climatology, surface drifter, and Geosat altimeter data as well as eddy-resolving math formula and math formula Community Modeling Effort North Atlantic model results. Both observational and numerical methods give a consistent picture of the concentration of mesoscale variability along the mean zonal flow bands. Three areas of high eddy energy can be found in all observational data sets: the North Equatorial Current, the North Atlantic Current, and the Azores Current. With increasing horizontal resolution the numerical models give a more realistic representation of the variability in the first two regimes, while no improvement is found with respect to the Azores Current Frontal Zone. Examination of the upper ocean hydrographic structure indicates baroclinic instability to be the main mechanism of eddy generation and suggests that the model deficiencies in the Azores Current area are related to deficiencies in the mean hydrographic fields. A linear instability analysis of the numerical model output reveals that instability based on the velocity shear between the mixed layer and the interior is also important for the generation of the mid-ocean variability, indicating a potential role of the mixed layer representation for the model. The math formula model successfully simulates the northward decrease of eddy length scales observed in the altimeter data, which follow a linear relationship with the first baroclinic Rossby radius. An analysis of the eddy-mean flow interaction terms and the energy budget indicates a release of mean potential energy by downgradient fluxes of heat in the main frontal zones. At the same time the North Atlantic Current is found to be supported by convergent eddy fluxes of zonal momentum.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/94JC01654
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 18
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    Aquatic Physiosphere-Biosphere Dynamics and Modelling (2021)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: This encyclopedia is a reference for aquatic physical, biological and biogeochemical sciences, collecting and connecting a number of topics, concepts and facts about aquatic systems and their scientific investigation. The scope of the book comprises the aquatic physiosphere-biosphere transition zone, an entity that encompasses both inanimate matter and collectives (the physiosphere) as well as living organisms and collectives (the biosphere). This combined approach is meaningful because both realms are intimately linked and because available methods of investigation are often similar. Much can be gained from considering both spheres at and across their interface jointly, and while there is a strong focus on marine systems, most concepts presented are also applicable to freshwater systems. This presented snapshot of knowledge of the transition zone between the aquatic physiosphere and biosphere is taken from a very specific angle: the point of view of a modeler. Modeling is not only a state-of-the-art mode of scientific investigation, but also requires the explicit specification of all assumptions (helping to avoid fallacies), and offers the advantage of being quantitative and allows for theoretical "what if" scenarios. As in any reference work, equal emphasis is given to fundamental facts, the definition of terms and the explanation of concepts, in an attempt to establish a joint language for physicists, biologists and biogeochemists. Although originating from a modeler's approach to nature, the resulting suite of compatible concepts may also be useful beyond modeling purposes. Furthermore, the material is presented in a condensed, straightforward way. Hence, the length of each entry is limited to one (occasionally two) pages, thus offering a quick introductory overview. This excludes lengthy derivations and very specialized details. The book is geared towards researchers, teachers and advanced students in the field of aquatic (marine and limnic) sciences, in particular those interested or involved in interdisciplinary work.
    Type: Book , NonPeerReviewed
    Format: text
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    OceanRep: Book
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