Banks, C. J.; Brandon, M. A. and Garthwaite, P. H.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.3189/172756406781811871|
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During March 2003, Autosub, an autonomous underwater vehicle (AUV) operated by the UK National Oceanography Centre, Southampton, was deployed under sea ice north of Thurston Island, Amundsen Sea, Antarctica (at 71°S, 100°W). The vehicle was fitted with an upward-looking 300 kHz acoustic Doppler current profiler (ADCP) to provide current velocity above the AUV. The ADCP also recorded ranges to the ocean–ice interface. Such data can be used to derive sea-ice draft by using a number of novel processing steps such as correcting for the coordinate systems of the ADCP unit and the vehicle as well as corrections for changes in sound speed. This paper outlines the processing stages required to obtain a probability density function (PDF) of sea-ice draft and presents PDFs for the region north of Thurston Island. The distribution of ice draft was found to be unimodal, with modes between 2.2 and 2.4 m. Given the uncertainty in sound speed, the limit of accuracy was estimated as ~6 cm.
|Item Type:||Journal Article|
|Copyright Holders:||2006 Glaciological Society|
|Keywords:||Antarctica; Autosub; sea ice; draft; thickness; Thurston Island; Probablity Density Function|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
Mathematics, Computing and Technology > Mathematics and Statistics
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Mark Brandon|
|Date Deposited:||15 Apr 2008|
|Last Modified:||28 Mar 2014 12:57|
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