Water mass characteristics in the deep layers of the western Ionian Basin observed during May 2003

Details Water mass characteristics in the deep layers of the western Ionian Basin observed during May 2003 Water mass characteristics in the deep layers of the western Ionian Basin observed during May 2003

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305608h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05608

Physics

2

Oceanography: General: Continental Shelf And Slope Processes (3002), Oceanography: General: Numerical Modeling (0545, 0560), Oceanography: General: Upwelling And Convergences (4964)

Scientific paper

CTD measurements carried out in the southern Adriatic Sea and in the western Ionian basin (Eurafrican Mediterranean Sea) during May 2003 by the German research vessel Poseidon (Poseidon cruise 298) and numerical simulations are used to elucidate aspects of the abyssal circulation of this oceanic region. The observations reveal that dense waters of Adriatic origin were strongly diluted along their way on the Italian continental slope, whilst their characteristics remained better preserved in a region located further east. Numerical simulations carried out by means of a nonlinear, reduced-gravity plume model confirm the observations and contribute to explain their cause: The very steep topographic slope along the Italian shelf in the region of the Gulf of Taranto induces strong entrainment of intermediate waters in the bottom layers. Instead, the bottom waters of Adriatic origin which, along their path further east, encounter gentler topographic variations, are weakly diluted by turbulent mixing and, therefore, better preserve their original characteristics. The remarkable differences in the simulated turbulent mixing along these two different paths are accentuated by the presence of a noticeable zonal gradient of potential density existing in the near-bottom layers of the northern Ionian basin.

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