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| Titel |
Salinity in the Sicily Channel corroborates the role of the Adriatic–Ionian Bimodal Oscillating System (BiOS) in shaping the decadal variability of the Mediterranean overturning circulation |
| VerfasserIn |
M. Gačić, K. Schroeder, G. Civitarese, S. Cosoli, A. Vetrano, G. L. Eusebi Borzelli |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2013-01-29), S.83-90 |
| Datensatznummer |
250017452
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| Publikation (Nr.) |
 copernicus.org/os-9-83-2013.pdf |
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| Zusammenfassung |
| Previous studies have demonstrated that the salinity in the Levantine basin
depends on the intensity of the Atlantic water (AW) inflow. Moreover, its
spreading eastward (to the Levantine basin) or northward (to the Ionian Sea)
is determined by the Ionian circulation pattern, i.e. by the
Adriatic–Ionian Bimodal Oscillating System (BiOS) mechanism. The aim of
this paper is to relate salinity variations in the Levantine basin to the
salt content variability in the core of the Levantine Intermediate Water
(LIW) passing through the Sicily Channel (SC) and its possible impact on the
Western Mediterranean Transition – WMT (i.e. the sudden salinity and
temperature increase in the deep layer of the Algero-Provençal subbasin
occurring since 2004). From the historical data set MEDAR/MEDATLAS in the
Levantine and northern Ionian, we present evidence of decadal occurrences of
extreme salinities associated with the varying influx of AW over the last 60 yr. Furthermore, we show that the salinity variations in the two
subbasins are out of phase. High-salinity episodes in the Levantine are a
pre-conditioning for the potential occurrence of the events like the Eastern
Mediterranean Transient (EMT). Cross-correlation between the salinity time
series in the Levantine basin and in the SC suggests that the travel time of
the LIW is between 10 and 13 yr. Comparing the timing of the salinity
increase associated with the WMT and the salinity in the LIW core in the SC,
we estimate that the total time interval needed for the signal propagating
from the Levantine to reach the deep mixed layers of the
Algero-Provençal subbasin is about 25 yr. We also showed that the
extra salt input from the eastern Mediterranean contribute up to about
60% to the salt content increase in the bottom layer of the western
Mediterranean. |
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