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On top of the world
On top of the world
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John Kemp, right, augers a hole for the Ice-Tethered Profiler. (Photo by Rick Krishfield, WHOI) |
WHOI researchers scouted the perfect spot to deploy instruments in the Beaufort
Sea in the western Arctic Ocean. In August 2004, John Kemp
(far right) and Rick Krishfield found their spot: a stable,
four-meter-thick piece of ice to install an Ice-Tethered Profiler
(ITP). Developed at WHOI by John Toole, the ITP is secured
to a drifting ice flow. It dangles an instrumented cable into
the ocean to measure water temperature and salinity—through
all seasons and over several years—transmitting data back
via satellite. (It was also an ideal spot for polar bears—hence
Seaman Andrew Kaiser, above, of the Canadian Coast Guard Icebreaker
Louis S. St. Laurent and his shotgun.)
Using a variety of instruments to measure ocean, ice, and
atmosphere in the Beaufort Sea, WHOI researchers seek to elucidate
the sea’s critical role in global climate. Vast amounts of
fresh water collect in the sea: from the Pacific Ocean through
the Bering Strait; from precipitation and melting snow and
ice; and from great Siberian and Canadian rivers draining
into it. This huge freshwater reservoir is trapped by a wind-driven,
cyclonic current called the Beaufort Gyre. WHOI physical oceanographer
Andrey Proshutinsky has theorized that when the winds occasionally
shift, the gyre weakens, allowing large volumes of fresh water
to leak into the North Atlantic. Th is flywheel may have large
impacts on ocean circulation and climate, and it may be sensitive
to global warming. Nobody knows for sure, because the Beaufort
Sea is among the Earth’s most hostile and inaccessible regions,
and data is scarce. But pioneering, annual expeditions to
the Beaufort Sea from 2003 to 2008 will begin to reveal its
secrets.
The Beaufort Gyre Freshwater Experiment is funded by the
National Science Foundation and the WHOI Ocean and Climate
Change Institute. The Cecil H. and Ida M. Green Technology
Innovation Award at WHOI funded initial development of the
ITP.
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