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  • 11
    Electronic Resource
    Electronic Resource
    A semispectral model on the β-plane (1982)
    Springer
    Ocean dynamics 35 (1982), S. 187-201 
    Details
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wird ein numerisches Verfahren zur Lösung des linearisierten hydrodynamischen Gleichungssystems auf der β-Ebene angegeben. Anschließend wird die Reaktion eines rechteckigen Ozeans auf variable Windfelder behandelt und anhand von Beispielen erläutert. Das Modell benötigt pro Frequenz und meridionaler Wellenzahl bei einer Vertikalauflösung von 20 m und einer Horizontalauflösung inx-Richtung von 30 km nur 60 s Rechenzeit auf einer CYBEr 76. Der Anwendungsbereich des Modells liegt im Frequenzbereich der barotropen und baroklinen Rossby-Wellen.
    Abstract: Résumé On présente les procédés numériques utilisés pour résoudre le système d'équations linéaires hydrodynamiques dans le plan-β. On étudie ensuite la réponse d'un océan rectangulaire soumis à des champs de vents variables et on l'explique à l'aide d'exemples. Pour une résolution verticale de 20 m et une autre horizontale dans la direction-x de 30 km, le modèle nécessite seulement 60 s sur un ordinateur CYBER 76 par fréquence et nombre d'onde méridien. Sous cette forme, le modèle est applicable dans le domaine des fréquences des ondes de Rossby barotropes et baroclines.
    Notes: Summary The numerical procedures used in solving the linear hydrodynamic equations on the β-plane are being described. The response characteristics of a rectangular ocean basin are discussed and examples of the solution given. For a vertical resolution of 20 m and a horizontal one (x-direction) of 30 km, the model needs only 60 s computer time per frequency and meridional wave number on a CYBER 76. In the present form it can be applied to the frequency ranges of baroclinic and barotropic Rossby waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02226240
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    Paper (German National Licenses)
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  • 12
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    The role of mesoscale eddies in the source regions of the Agulhas Current (1999)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 29 . pp. 2303-2317.
    Details
    Publication Date: 2020-08-04
    Description: A primitive equation model to study the dynamics of the Agulhas system has been developed. The model domain covers the South Atlantic and the south Indian Ocean with a resolution of ⅓° in the Agulhas region while coarser outside. It is driven by a climatology of the European Centre for Medium-Range Weather Forecasts. It is shown that the model simulates the Agulhas Current, its retroflection, and the ring shedding successfully. The model results show baroclinic anticyclonic eddies in the Mozambique Channel and east of Madagascar, which travel toward the northern Agulhas Current. After the eddies reach the current they are advected southward with the mean flow. Due to the limited numerical resolution only a few eddies reach the retroflection region without much modification. These eddies are responsible for drastic enhancement of the heat transfer from the Indian Ocean to the South Atlantic and lead to periodicities in the interoceanic heat transport of about 50 days superimposed on the seasonal variability. Combined satellite data from TOPEX/Poseidon and ERS-1 show that the observed vortices in the Mozambique Channel are comparable to those seen in the model. In contrast to this the simulated eddies east of Madagascar seem not to be well reproduced. Analyses of the energy conversion terms between the mean flow and the eddies suggest that barotropic instability plays an important role in the generation of Mozambique Channel eddies. For the generation of Agulhas rings and other eddy structures in the model the barotropic instability mechanism seems to be minor, and baroclinic instability mechanisms are more likely.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(1999)029〈2303:TROMEI〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 13
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    Lagrangian measurements in the Malvinas current (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, New York, pp. 239-247.
    Details
    Publication Date: 2020-04-03
    Description: Direct measurements of magnitude of the northward flow of the Malvinas (Falkland) Current have recently been made with two types of Lagrangian platforms: ALACE floats which cycled between 750-m depth and the sea surface, and 100-m drogued surface drifters. Each data set clearly delineates the path of the Malvinas Current, and the vertical shears inferred from them are commensurate with historical geostrophic shears. Velocities from the surface drifters are used here to adjust geostrophic shears from historical measurements, and the results confirm a large transport of the current, as previously implied by numerical models and a regional inverse calculation. At 42°S, the northward transport of the Malvinas Current in the upper 3000 m appears to be about 70 Sv, several times larger than estimates obtained by adjusting geostrophic shears to assumed levels of no motion. This large barotropie component may have significance in the cross-frontal transfer of intermediate and deep waters from the circumpolar current to the adjacent flow regimes in the South Atlantic, and thus on the inter-basin exchange of water masses.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1007/978-3-642-80353-6_12
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    OceanRep: Book chapter
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