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| Titel |
The oceanic tides in the South Atlantic Ocean |
| VerfasserIn |
M. L. Genco, F. Lyard, C. Provost |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 9 ; Nr. 12, no. 9, S.868-886 |
| Datensatznummer |
250011085
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| Publikation (Nr.) |
 copernicus.org/angeo-12-868-1994.pdf |
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| Zusammenfassung |
| The finite element ocean tide model of Le
Provost and Vincent (1986) has been applied to the simulation of the M2
and K1 components over the South Atlantic Ocean. The discretisation
of the domain, of the order of 200 km over the deep ocean, is refined down to 15
km along the coasts, such refinement enables wave propagation and damping over
the continental shelves to be correctly solved. The marine boundary conditions,
from Dakar to Natal, through the Drake passage and from South Africa to
Antarctica, are deduced from in situ data and from Schwiderski's solution and
then optimised following a procedure previously developed by the authors. The
solutions presented are in very good agreement with in situ data: the root mean
square deviations from a standard subset of 13 pelagic stations are 1.4 cm for M2
and 0.45 cm for K1, which is significantly better overall than
solutions published to date in the literature. Zooms of the M2
solution are presented for the Falkland Archipelago, the Weddell Sea and the
Patagonian Shelf. The first zoom allows detailing of the tidal structure around
the Falklands and its interpretation in terms of a stationary trapped Kelvin
wave system. The second zoom, over the Weddell Sea, reveals for the first time
what must be the tidal signal under the permanent ice shelf and gives a solution
over that sea which is generally in agreement with observations. The third zoom
is over the complex Patagonian Shelf. This zoom illustrates the ability of the
model to simulate the tides, even over this area, with a surprising level of
realism, following purely hydrodynamic modelling procedures, within a global
ocean tide model. Maps of maximum associated tidal currents are also given, as a
first illustration of a by-product of these simulations. |
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