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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
  • 2
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    A note on overflow eddies (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 . pp. 1661-1667.
    Details
    Publication Date: 2016-10-20
    Description: Satellite-tracked drifters drogued at 100 m depth show very intensive cyclonic eddies over the Denmark Strait Overflow Water (DSOW) along the continental slope of East Greenland between the Denmark Strait and Cape Farewell. Their core of 20 km diameter is probably in near solid-body rotation; azimuthal speed increases with depth, which is consistent with downward velocities in the core, and supports the conclusions of Bruce (1995). At 100m depth, velocities in the eddies reach 50 cm s−1 south of the Denmark Strait and 15 cm s−1 near Cape Farewell. Maximum speed in one of the eddies is found at the top of the DSOW, σθ = 27.80. The eddies may play an important role in water mass conversion in the Irminger Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0637(96)00073-8
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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