Marsan D., Weiss J., Larose E., Métaxian Jean-Philippe. (2012). Sea-ice thickness measurement based on the dispersion of ice swell. Journal of the Acoustical Society of America, 131 (1), p. 80-91. ISSN 0001-4966.
Titre du document
Sea-ice thickness measurement based on the dispersion of ice swell
Marsan D., Weiss J., Larose E., Métaxian Jean-Philippe
Source
Journal of the Acoustical Society of America, 2012,
131 (1), p. 80-91 ISSN 0001-4966
The dispersion of flexural waves propagating in the Arctic sea ice cover is exploited in order to locally measure the ice thickness. The observed dispersion, for waves filtered in the 4-20 s period interval, at up to 4 broad-band seismometers deployed in Spring 2007 near the North Pole, is compared to a parameterized model that accounts for a complex wavefield made of a superposition of independent plane waves with different amplitudes and back-azimuth angles. The parameterization, that includes finding the best modeled ice thickness, is performed by using the cross-correlation functions between the seismometers. The ice thickness is estimated to 2.5+/-0.2 m for the similar to 1 km-large floe the seismic stations were deployed on, which is coherent with other, independent measurements at this site. This study thus demonstrates the feasibility of using broad-band seismometers deployed on the sea-ice in order to passively measure the ice thickness, without requiring active sources nor human intervention.
