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)
Pagina inizio
  • 731 (literal)
Pagina fine
  • 746 (literal)
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)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26(4) (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (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 4–6 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)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Insieme di parole chiave di
data.CNR.it