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SeaBED in the Antarctic

Which Way is Up?

Most oceanographic survey instruments look down at the seafloor. On a recent trip to the Southern Ocean, though, members of Hanu Singh's lab equipped one of their SeaBED vehicles to look up--at the underside of sea ice. Clay Kunz and Peter Kimball fitted the autonomous underwater vehicle (AUV) Puma with an upward-looking sonar to measure and map the underside of sea ice floes. These data will be combined with airborne measurements of sea-ice surface elevation and with information from ice coring surveys to improve estimates of ice thickness and total sea-ice volume. (Photo by Peter Kimball, Woods Hole Oceanographic Institution)

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