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Autonomous underwater vehicle measurements of surface wave decay and directional spectra in the marginal sea ice zone

Autonomous underwater vehicle measurements of surface wave decay and directional spectra in the marginal sea ice zone
Autonomous underwater vehicle measurements of surface wave decay and directional spectra in the marginal sea ice zone
In March 2003 several autonomous underwater vehicle (AUV) missions were carried out under sea ice in the western Bellingshausen Sea. Data from the upward-looking acoustic Doppler current profiler (ADCP) on the “Autosub” AUV indicate a strongly oscillating horizontal velocity of the ice due to ocean swell. Swell period, height, direction, and directional spread have been computed every 800 m from the ice edge to 10 km inward for three missions. Exponential, period-dependent attenuation of waves propagating through sea ice was observed. Mean period increased with distance from the ice edge. The wave field refracted during propagation. The directional wave spread does not seem to relate to distance from the ice edge, although higher frequencies tended to be more spread. If suitably deployed, an ordinary ADCP may be used with this technique to study both scalar and directional properties of waves in open or ice-covered water.
0022-3670
71-83
Hayes, D.R.
1ff2d938-3a28-4cf6-a309-da9af9a0554c
Jenkins, A.
477dd540-bc7e-4d2f-a7f8-aec2f2098650
McPhail, S.
58ac4bcd-26a6-4845-8e81-6d6a8f18aed7
Hayes, D.R.
1ff2d938-3a28-4cf6-a309-da9af9a0554c
Jenkins, A.
477dd540-bc7e-4d2f-a7f8-aec2f2098650
McPhail, S.
58ac4bcd-26a6-4845-8e81-6d6a8f18aed7

Hayes, D.R., Jenkins, A. and McPhail, S. (2007) Autonomous underwater vehicle measurements of surface wave decay and directional spectra in the marginal sea ice zone. Journal of Physical Oceanography, 37 (1), 71-83. (doi:10.1175/JPO2979.1).

Record type: Article

Abstract

In March 2003 several autonomous underwater vehicle (AUV) missions were carried out under sea ice in the western Bellingshausen Sea. Data from the upward-looking acoustic Doppler current profiler (ADCP) on the “Autosub” AUV indicate a strongly oscillating horizontal velocity of the ice due to ocean swell. Swell period, height, direction, and directional spread have been computed every 800 m from the ice edge to 10 km inward for three missions. Exponential, period-dependent attenuation of waves propagating through sea ice was observed. Mean period increased with distance from the ice edge. The wave field refracted during propagation. The directional wave spread does not seem to relate to distance from the ice edge, although higher frequencies tended to be more spread. If suitably deployed, an ordinary ADCP may be used with this technique to study both scalar and directional properties of waves in open or ice-covered water.

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Published date: January 2007

Identifiers

Local EPrints ID: 49708
URI: http://eprints.soton.ac.uk/id/eprint/49708
ISSN: 0022-3670
PURE UUID: 520410c3-5d79-40e4-9080-60507182bfdd

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Date deposited: 23 Nov 2007
Last modified: 15 Mar 2024 09:58

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Contributors

Author: D.R. Hayes
Author: A. Jenkins
Author: S. McPhail

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