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Measurement of sea-ice draft using upward-looking ADCP on an autonomous underwater vehicle

Measurement of sea-ice draft using upward-looking ADCP on an autonomous underwater vehicle
Measurement of sea-ice draft using upward-looking ADCP on an autonomous underwater vehicle
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.
0260-3055
211-216
Banks, Christopher J.
5d65ec1e-ed5f-48fc-9b05-3e46f24c35dc
Brandon, Mark A.
a9a5d32a-ca17-4ab9-9b5b-e067bd0646ce
Garthwaite, Paul H.
83e9acdb-a78f-4ad1-a287-a6c841180ffe
Banks, Christopher J.
5d65ec1e-ed5f-48fc-9b05-3e46f24c35dc
Brandon, Mark A.
a9a5d32a-ca17-4ab9-9b5b-e067bd0646ce
Garthwaite, Paul H.
83e9acdb-a78f-4ad1-a287-a6c841180ffe

Banks, Christopher J., Brandon, Mark A. and Garthwaite, Paul H. (2006) Measurement of sea-ice draft using upward-looking ADCP on an autonomous underwater vehicle. Annals of Glaciology, 44 (1), 211-216. (doi:10.3189/172756406781811871).

Record type: Article

Abstract

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.

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Published date: 2006
Organisations: Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 208159
URI: http://eprints.soton.ac.uk/id/eprint/208159
ISSN: 0260-3055
PURE UUID: a549356f-92df-4c68-8af6-ece0ea6c1a99

Catalogue record

Date deposited: 16 Jan 2012 15:48
Last modified: 16 Jul 2019 23:14

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