http://www.cnr.it/ontology/cnr/individuo/prodotto/ID49368
Variability of currents in front of the Venice Lagoon, Northern Adriatic Sea (Articolo in rivista)
- Type
- Label
- Variability of currents in front of the Venice Lagoon, Northern Adriatic Sea (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
Cosoli S. (1), Gacic M. (1), Mazzoldi A. (2) (2008)
Variability of currents in front of the Venice Lagoon, Northern Adriatic Sea
in Annales geophysicae (1988)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Cosoli S. (1), Gacic M. (1), Mazzoldi A. (2) (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
- http://www.ann-geophys.net/26/731/2008/angeo-26-731-2008.html
www.ann-geophys.net/26/731/2008/ (literal)
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- ISI Web of Science (WOS) (literal)
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- (1) Istituto Nazionale di Oceanografia e di Geofisica Sperimentale OGS, Sgonico (Trieste), Italy
(2) Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche ISMAR-CNR, Castello 1364/A, Venice, Italy
(literal)
- Titolo
- Variability of currents in front of the Venice Lagoon, Northern Adriatic Sea (literal)
- Abstract
- Variability time scales and modes of the flow in the water column in the northern Adriatic Sea for late summer 2002 are described based on current recorded from a single bottom-mounted ADCP in the shallow-water area in front of the Venice Lagoon. The time averaged flow was directed 277° E (CCW), roughly aligned with the coastline, with typical magnitudes in the range 46 cm/s and a limited, insignificant clockwise veering with depth. Tidal forcing was weak and mainly concentrated in the semidiurnal frequency band, with a barotropic (depth-independent) structure. On a diurnal time scale, tidal signal was biased by the sea-breeze regime and was characterized by a clockwise veering with depth according to the Ekman spiral. A complex EOF analysis on the velocity profile time series extracted two dominant modes of spatial variability that explained more than 90% of the total variance in the current field. More than 78% of the total variance was accounted for by the first EOF mode, with a barotropic structure that contained the low-frequency components and the barotropic tidal signal at semidiurnal and diurnal frequencies. The second mode had a baroclinic structure with zero-crossing at mid-depth that was related with the response of the water column to high-frequency wind-driven diurnal sea breeze variability.
Response of low-passed non-tidal currents to local wind stress was fast and immediate, with negligible temporal lag up to mid-depth. Current vectors were pointing to the right of wind stress, as expected from the surface Ekman veering, but with angles smaller than the expected ones. A time lag in the range 10 to 11 h was found below 8 m depth, with current vectors pointing to the left of wind stress and a counter-clockwise veering towards the bottom. The delay was consistent with the frictional adjustment time scale describing the dynamics of a frictionally dominated flow in shallow water, suggesting the importance of bottom friction on motion in the water column.
(literal)
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