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| Titel |
On the impact of the Bimodal Oscillating System (BiOS) on the biogeochemistry and biology of the Adriatic and Ionian Seas (Eastern Mediterranean) |
| VerfasserIn |
G. Civitarese, M. Gačić, M. Lipizer, G. L. Eusebi Borzelli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 12 ; Nr. 7, no. 12 (2010-12-15), S.3987-3997 |
| Datensatznummer |
250005104
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| Publikation (Nr.) |
 copernicus.org/bg-7-3987-2010.pdf |
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| Zusammenfassung |
| Analysis of 20-year time-series of the vertically averaged salinity and
nutrient data in the Southern Adriatic shows that the two parameters are
subject to strong decadal variability. In addition, it is documented that
nutrient and salinity variations are out of phase. Nutrients in the Ionian
and in the Adriatic vary in parallel except that generally the nutrient
content in the Adriatic is lower than in the Ionian, a fact that has been
attributed to primary producer consumption following the winter convective
mixing. As shown earlier, North Ionian Gyre (NIG) changes its circulation
sense on a decadal scale due to the Bimodal Oscillating System, i.e. the
feedback mechanism between the Adriatic and Ionian. Cyclonic circulation
causes a downwelling of the nitracline along the borders of the NIG and a
decrease in the nutrient content of the water flowing into the Adriatic
across the Otranto Strait, and vice versa. In addition, the highly
oligotrophic central area of the Ionian shows annual blooms only during
cyclonic NIG circulation. Inversion of the sense of the NIG results in the
advection of Modified Atlantic Water or of the Levantine/Eastern
Mediterranean waters in the Adriatic. Here, we show that the presence of
allochtonous organisms from Atlantic/Western Mediterranean and Eastern
Mediterranean/temperate zone in the Adriatic are concurrent with the
anticyclonic and cyclonic circulations of the NIG, respectively. On the
basis of the results presented, a revision of the theory of Adriatic
ingressions formulated in the early 1950s is proposed. |
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