for New Expendable Instruments for Arctic Oceanographic Measurements.
Discussions with oceanographers at the recent Arctic Circulation
workshop at Lamont revealed a desire to make observations down to
4000-5000 meters depth in the Arctic Ocean.
This is not feasible from an ice camp with presently available
instruments. A concept will be
presented for an expendable instrument, which reports measurements back to
the surface by acoustic modem. Acoustic
modem technology has been demonstrated to provide reliable digital data
transmission at distances up to 5000 meters.
A modem transmitter can be incorporated into an expendable probe
containing a CTD sensor or other instruments, and telemeter measurements
back to a receiver supported by a transducer suspended in the water
beneath the ice canopy. The
same concept can be extended to provide deep measurements from a submarine
operating beneath the ice, in which case the probe would be deployed
through the ship’s trash disposal unit, and the modem receiver supported
by a transducer mounted on the submarine’s hull.