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| Titel |
An experimental study of the Atlantic variability on interdecadal timescales |
| VerfasserIn |
M. Vincze, I. M. Jánosi, E. Barsy, T. Tél, A. Várai |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 3 ; Nr. 19, no. 3 (2012-06-14), S.335-343 |
| Datensatznummer |
250014211
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| Publikation (Nr.) |
 copernicus.org/npg-19-335-2012.pdf |
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| Zusammenfassung |
| A series of laboratory experiments has been carried out to model the basic
dynamics of the multidecadal variability observed in North Atlantic sea
surface temperature (SST) records. According to the minimal numerical sector
model introduced by te Raa and Dijkstra (2002), the three key components to excite such a
low-frequency variability are rotation, meridional temperature gradient and
additive thermal noise in the surface heat forcing. If these components are
present, periodic perturbations of the overturning background flow are
excited, leading to thermal Rossby mode like propagation of anomalous patches
in the SST field. Our tabletop scale setup was built to capture this
phenomenon, and to test whether the aforementioned three components are
indeed sufficient to generate a low-frequency variability in the system. The
results are compared to those of the numerical models, as well as to oceanic
SST reanalysis records. To the best of our knowledge, the experiment described here
is the very first to investigate the dynamics of the North Atlantic
multidecadal variability in a laboratory-scale setup. |
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