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| Titel |
Dynamically constrained ensemble perturbations – application to tides on the West Florida Shelf |
| VerfasserIn |
A. Barth, A. Alvera-Azcárate, J.-M. Beckers, R. H. Weisberg, L. Vandenbulcke, F. Lenartz, M. Rixen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 3 ; Nr. 5, no. 3 (2009-07-14), S.259-270 |
| Datensatznummer |
250002576
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| Publikation (Nr.) |
 copernicus.org/os-5-259-2009.pdf |
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| Zusammenfassung |
| A method is presented to create an ensemble of perturbations that satisfies
linear dynamical constraints. A cost function is formulated defining the
probability of each perturbation. It is shown that the perturbations created
with this approach take the land-sea mask into account in a similar way as
variational analysis techniques. The impact of the land-sea mask is
illustrated with an idealized configuration of a barrier island.
Perturbations with a spatially variable correlation length can be also
created by this approach. The method is applied to a realistic configuration
of the West Florida Shelf to create perturbations of the M2 tidal parameters
for elevation and depth-averaged currents. The perturbations are weakly
constrained to satisfy the linear shallow-water equations. Despite that the
constraint is derived from an idealized assumption, it is shown that this
approach is applicable to a non-linear and baroclinic model. The amplitude of
spurious transient motions created by constrained perturbations of initial
and boundary conditions is significantly lower compared to perturbing the
variables independently or to using only the momentum equation to compute the
velocity perturbations from the elevation. |
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