ITP 3 Deployment Operations |
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On August 21, an
ice floe off the port side of the CCGS Louis S St. Laurent is surveyed to determine
thickness of 3.5 m as a candidate for IBO deployment.
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Two days later,
Rick Krishfield and Ryan begin deployment of the IMB with the installation of
the ice thermistor strings.
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John Kemp, Kris Newhall,
and Doug Sieberg haul gear across a bridge over a frozen melt pond.
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Work
begins on drilling a hole for ITP3 while Doug Sieberg installs a snow sounder and
air temperature mast for the IMB.
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With
the IMB installation complete, Kris Newhall, John Kemp,
and David Sisco load the ITP wire spool onto the winch apparatus.
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John Kemp operates the tag line to the ITP 3 profiler, while
Rick Krishfield attaches the instrument brackets to the wire.
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The potted cable
is attached mechanically and electrically to the buoy package (foreground), and
the slip bale and modem grounding plates are attached at the end of the potted
segment (background).
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The mooring is
deployed after the ITP 3 surface package is in place, although later plywood
covered in snow will be situated under the top float to reduce ablation of the
ice floe by the buoy.
Photos by Chris
Linder.
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ITP 3 and IMB 07950 were the second
Ice Based Observatory (IBO) deployed during JWACS 2005. Without either ship’s propulsion (while a
main shaft bearing on the ship was being repaired) or helicopter support
(grounded), the personnel and gear were deployed over the port side of the CCGS
Louis S St. Laurent onto a small (50 m diameter) 3.35 m thick ice floe after
several days of surveying and false starts interrupted by the formation of cracks
in the ice.
On August 23, a bridge was built to
cross a large (4 m) gap between floes to the ITP deployment site. It took only about 3.5 hours overall to
deliver all of the ITP gear to the site, deploy ITP 3, and return with the
installation equipment. Meanwhile, deploying IMB 07950 took about an hour and a
half to drill the holes and install the sensors and buoy. Subsequently, the wires were covered with
snow.
More information and photos on the
deployment operation are also available here and at: http://www.whoi.edu/beaufortgyre/dispatch2005/dispatch22.html
and http://www.whoi.edu/beaufortgyre/dispatch2005/dispatch23.html.
Last updated: April 23, 2013 | 
