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Instrument: EPSONDE
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A Epsonde is an instrument used to measure turbulence in the deep ocean.

Epsonde is a tethered free-fall profiling system used to obtain
temperature microstructure and velocity turbulence data to a
depth of at least 1500 m. Epsonde, which carries a variety of
slow and fast sensors, is deployed on a loose kevlar
multiconductor cable by a specialized wire-handling system. Data
are transmitted from this underwater unit (1792 samples per
second) to a shipboard system, which includes a dedicated
microcomputer for data logging and online data processing. The
performance of this system is demonstrated by discussing a study
of turbulent mixing processes in a lens of Mediterranean water
(a MEDDY) found at a depth of 1000 m in the Canary basin. These
studies indicate that turbulent kinetic energy dissipation may
be an important mechanism in determining the decay and lifetime
of a MEDDY.

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