For this reason six hydrological cruises were carried out
in the Strait area every three months, from February 1994 to May
1995, covering a grid
of 44 main stations.
For this reason six hydrological cruises were carried out
in the Strait area every three months, from February 1994 to May
1995, covering a grid
of 44 main stations.
At each station the thermohaline measurements were performed
by CTD (Sea Bird SBE 9/11 or Neil Brown Mk III), fitted with a G.O.
Rosette multisampler (12 or 24 bottles) for water sampling for chemical
determinations (dissolved oxygen, nutrients, suspended matter) as well
as for salinity control analyses.
During the same period an extensive series of sea current
measurements was performed, employing from 5 to 14 instruments placed
on 2 to 6 moorings along a
section
across the Strait at the latitude
of 39 50'N.
The
diagram
summarizing the time-series of each of the current
meters employed during the survey is also shown. Note that at
station 306 an Acoustic Doppler Current Profiler (ADCP) was moored at
the depth of 440 meters; it measured the currents above it (30 - 430 m)
in 8 m bins every hours (150 pings separated by 22 seconds are averaged).
All the remaining instruments employed were self recording current meters
(NBA or Aanderaa) with a sampling interval of 20 minutes.
Sediment traps were moored at the bottom of stations 301 and
304 to evaluate the vertical associated fluxes of sediments.
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