Autonomous underwater vehicles (AUVs) and investigations of the ice-ocean interface in Antarctic and Arctic waters

• Published in: Journal of Glaciology
• Main Authors: Dowdeswell, J. A., Evans, J., Mugford, R., Griffiths, G., Mcphail, S., Millard, N., Stevenson, P., Brandon, M. A., Banks, C., Heywood, K. J., Price, M. R., Dodd, P. A., Jenkins, A., Nicholls, K. W., Hayes, D., Abrahamsen, E. P., Tyler, P., Bett, B., Jones, D., Wadhams, P., Wilkinson, J. P., Stansfield, K., Ackley, S.
• Other Authors: School of Environmental Sciences Norwich, University of East Anglia Norwich (UEA), inconnu, Inconnu, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Oceanography Centre, Department of Physics Toronto, University of Toronto, Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), National Oceanography Centre Southampton (NOC), University of Southampton
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2008
• Subjects: [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Antarc*; Antarctic; Arctic; Ice Shelf; Ice Shelves; Journal of Glaciology; Sea ice; Tidewater
• Online Access: https://hal.science/hal-03494365; https://doi.org/10.3189/002214308786570773

International audience Limitations of access have long restricted exploration and investigation of the cavities beneath ice shelves to a small number of drillholes. Studies of sea-ice underwater morphology are limited largely to scientific utilization of submarines. Remotely operated vehicles, tethered to a mother ship by umbilical cable, have been deployed to investigate tidewater-glacier and ice-shelf margins, but their range is often restricted. The development of free-flying autonomous underwater vehicles (AUVs) with ranges of tens to hundreds of kilometres enables extensive missions to take place beneath sea ice and floating ice shelves. Autosub2 is a 3600 kg, 6.7 m long AUV, with a 1600 m operating depth and range of 400 km, based on the earlier Autosub1 which had a 500 rn depth limit. A single direct-drive d.c. motor and five-bladed propeller produce speeds of 1-2 m s(-1). Rear-mounted rudder and stern-plane control yaw, pitch and depth. The vehicle has three sections. The front and rear sections are free-flooding, built around aluminium extrusion space-frames covered with glass-fibre reinforced plastic panels. The central section has a set of carbon-fibre reinforced plastic pressure vessels. Four tubes contain batteries powering the vehicle. The other three house vehicle-control systems and sensors. The rear section houses subsystems for navigation, control actuation and propulsion and scientific sensors (e.g. digital camera, upward-looking 300 kHz acoustic Doppler current profiler, 200 kHz multibeam receiver). The front section contains forward-looking collision sensor, emergency abort, the homing systems, Argos satellite data and location transmitters and flashing lights for relocation as well as science sensors (e.g. twin conductivity-temperature-depth instruments, multibeam transmitter, sub-bottom profiler, AquaLab water sampler). Payload restrictions mean that a subset of scientific instruments is actually in place on any given dive. The scientific instruments carried on Autosub are described and ...