Publication Date:
2017-04-04
Description:
During the dedicated sea-truth cruise LIGURE2007, a part of
the intensive observational campaign Ligurian Sea Air-Sea Interaction Experiment
(LASIE) performed in the eastern Ligurian Sea (Italy) from 16th to 23rd June
in 2007, the R/V Urania carried out an intensive microstructure measurement program.
Most of these measurements were made between 17th and 20th, in the vicinity
of a spar buoy anchored 60 km off the coast in a region with a water column depth
of approximately 1500 m; the prevailing light wind conditions and intense solar radiation
limited the depth of the upper mixed layer to about 10–15m. We carried
out measurements of the structure of the upper water column to a depth exceeding
about 200 m. Interestingly, the microstructure measurements revealed multiple layers
of relatively elevated dissipation and diffusivity rates around a depth of about
100 m. Since the water column is shown not to be not conducive to double-diffusion,
these layered structures must have been produced by small-scale shear due to other
processes, such as breaking internal waves. In this paper, we describe the oceanographic
conditions prevailing at the time of the measurements, as well as the general
turbulent properties in the upper part of the water column. In particular, the layered
structures below the mixed layer are discussed in detail, with suggestions as to
the likely origin and possible ways of investigating these processes.
Description:
Published
Description:
1567-1586
Description:
1.8. Osservazioni di geofisica ambientale
Description:
JCR Journal
Description:
restricted
Keywords:
turbulence
;
Ligurian Sea
;
03. Hydrosphere::03.03. Physical::03.03.04. Upper ocean and mixed layer processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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